![Markus Metzger](/assets/img/avatar_default.png)
Impact: move the BTS buffer accounting to the mlock bucket Add alloc_locked_buffer() and free_locked_buffer() functions to mm/mlock.c to kalloc a buffer and account the locked memory to current. Account the memory for the BTS buffer to the tracer. Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
1463 lines
35 KiB
C
1463 lines
35 KiB
C
/* By Ross Biro 1/23/92 */
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/*
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* Pentium III FXSR, SSE support
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* Gareth Hughes <gareth@valinux.com>, May 2000
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*
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* BTS tracing
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* Markus Metzger <markus.t.metzger@intel.com>, Dec 2007
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/regset.h>
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#include <linux/tracehook.h>
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#include <linux/user.h>
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#include <linux/elf.h>
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#include <linux/security.h>
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#include <linux/audit.h>
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#include <linux/seccomp.h>
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#include <linux/signal.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/processor.h>
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#include <asm/i387.h>
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#include <asm/debugreg.h>
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#include <asm/ldt.h>
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#include <asm/desc.h>
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#include <asm/prctl.h>
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#include <asm/proto.h>
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#include <asm/ds.h>
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#include "tls.h"
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enum x86_regset {
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REGSET_GENERAL,
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REGSET_FP,
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REGSET_XFP,
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REGSET_IOPERM64 = REGSET_XFP,
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REGSET_TLS,
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REGSET_IOPERM32,
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};
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/*
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* does not yet catch signals sent when the child dies.
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* in exit.c or in signal.c.
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*/
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/*
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* Determines which flags the user has access to [1 = access, 0 = no access].
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*/
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#define FLAG_MASK_32 ((unsigned long) \
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(X86_EFLAGS_CF | X86_EFLAGS_PF | \
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X86_EFLAGS_AF | X86_EFLAGS_ZF | \
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X86_EFLAGS_SF | X86_EFLAGS_TF | \
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X86_EFLAGS_DF | X86_EFLAGS_OF | \
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X86_EFLAGS_RF | X86_EFLAGS_AC))
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/*
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* Determines whether a value may be installed in a segment register.
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*/
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static inline bool invalid_selector(u16 value)
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{
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return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL);
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}
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#ifdef CONFIG_X86_32
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#define FLAG_MASK FLAG_MASK_32
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static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
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{
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BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
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regno >>= 2;
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if (regno > FS)
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--regno;
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return ®s->bx + regno;
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}
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static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
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{
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/*
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* Returning the value truncates it to 16 bits.
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*/
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unsigned int retval;
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if (offset != offsetof(struct user_regs_struct, gs))
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retval = *pt_regs_access(task_pt_regs(task), offset);
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else {
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retval = task->thread.gs;
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if (task == current)
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savesegment(gs, retval);
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}
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return retval;
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}
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static int set_segment_reg(struct task_struct *task,
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unsigned long offset, u16 value)
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{
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/*
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* The value argument was already truncated to 16 bits.
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*/
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if (invalid_selector(value))
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return -EIO;
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/*
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* For %cs and %ss we cannot permit a null selector.
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* We can permit a bogus selector as long as it has USER_RPL.
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* Null selectors are fine for other segment registers, but
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* we will never get back to user mode with invalid %cs or %ss
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* and will take the trap in iret instead. Much code relies
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* on user_mode() to distinguish a user trap frame (which can
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* safely use invalid selectors) from a kernel trap frame.
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*/
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switch (offset) {
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case offsetof(struct user_regs_struct, cs):
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case offsetof(struct user_regs_struct, ss):
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if (unlikely(value == 0))
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return -EIO;
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default:
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*pt_regs_access(task_pt_regs(task), offset) = value;
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break;
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case offsetof(struct user_regs_struct, gs):
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task->thread.gs = value;
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if (task == current)
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/*
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* The user-mode %gs is not affected by
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* kernel entry, so we must update the CPU.
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*/
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loadsegment(gs, value);
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}
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return 0;
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}
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static unsigned long debugreg_addr_limit(struct task_struct *task)
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{
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return TASK_SIZE - 3;
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}
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#else /* CONFIG_X86_64 */
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#define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
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static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
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{
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BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
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return ®s->r15 + (offset / sizeof(regs->r15));
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}
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static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
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{
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/*
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* Returning the value truncates it to 16 bits.
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*/
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unsigned int seg;
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switch (offset) {
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case offsetof(struct user_regs_struct, fs):
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if (task == current) {
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/* Older gas can't assemble movq %?s,%r?? */
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asm("movl %%fs,%0" : "=r" (seg));
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return seg;
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}
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return task->thread.fsindex;
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case offsetof(struct user_regs_struct, gs):
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if (task == current) {
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asm("movl %%gs,%0" : "=r" (seg));
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return seg;
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}
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return task->thread.gsindex;
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case offsetof(struct user_regs_struct, ds):
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if (task == current) {
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asm("movl %%ds,%0" : "=r" (seg));
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return seg;
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}
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return task->thread.ds;
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case offsetof(struct user_regs_struct, es):
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if (task == current) {
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asm("movl %%es,%0" : "=r" (seg));
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return seg;
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}
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return task->thread.es;
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case offsetof(struct user_regs_struct, cs):
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case offsetof(struct user_regs_struct, ss):
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break;
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}
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return *pt_regs_access(task_pt_regs(task), offset);
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}
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static int set_segment_reg(struct task_struct *task,
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unsigned long offset, u16 value)
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{
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/*
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* The value argument was already truncated to 16 bits.
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*/
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if (invalid_selector(value))
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return -EIO;
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switch (offset) {
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case offsetof(struct user_regs_struct,fs):
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/*
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* If this is setting fs as for normal 64-bit use but
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* setting fs_base has implicitly changed it, leave it.
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*/
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if ((value == FS_TLS_SEL && task->thread.fsindex == 0 &&
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task->thread.fs != 0) ||
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(value == 0 && task->thread.fsindex == FS_TLS_SEL &&
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task->thread.fs == 0))
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break;
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task->thread.fsindex = value;
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if (task == current)
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loadsegment(fs, task->thread.fsindex);
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break;
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case offsetof(struct user_regs_struct,gs):
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/*
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* If this is setting gs as for normal 64-bit use but
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* setting gs_base has implicitly changed it, leave it.
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*/
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if ((value == GS_TLS_SEL && task->thread.gsindex == 0 &&
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task->thread.gs != 0) ||
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(value == 0 && task->thread.gsindex == GS_TLS_SEL &&
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task->thread.gs == 0))
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break;
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task->thread.gsindex = value;
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if (task == current)
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load_gs_index(task->thread.gsindex);
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break;
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case offsetof(struct user_regs_struct,ds):
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task->thread.ds = value;
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if (task == current)
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loadsegment(ds, task->thread.ds);
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break;
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case offsetof(struct user_regs_struct,es):
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task->thread.es = value;
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if (task == current)
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loadsegment(es, task->thread.es);
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break;
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/*
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* Can't actually change these in 64-bit mode.
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*/
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case offsetof(struct user_regs_struct,cs):
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if (unlikely(value == 0))
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return -EIO;
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#ifdef CONFIG_IA32_EMULATION
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if (test_tsk_thread_flag(task, TIF_IA32))
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task_pt_regs(task)->cs = value;
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#endif
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break;
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case offsetof(struct user_regs_struct,ss):
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if (unlikely(value == 0))
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return -EIO;
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#ifdef CONFIG_IA32_EMULATION
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if (test_tsk_thread_flag(task, TIF_IA32))
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task_pt_regs(task)->ss = value;
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#endif
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break;
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}
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return 0;
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}
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static unsigned long debugreg_addr_limit(struct task_struct *task)
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{
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#ifdef CONFIG_IA32_EMULATION
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if (test_tsk_thread_flag(task, TIF_IA32))
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return IA32_PAGE_OFFSET - 3;
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#endif
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return TASK_SIZE64 - 7;
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}
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#endif /* CONFIG_X86_32 */
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static unsigned long get_flags(struct task_struct *task)
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{
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unsigned long retval = task_pt_regs(task)->flags;
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/*
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* If the debugger set TF, hide it from the readout.
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*/
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if (test_tsk_thread_flag(task, TIF_FORCED_TF))
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retval &= ~X86_EFLAGS_TF;
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return retval;
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}
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static int set_flags(struct task_struct *task, unsigned long value)
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{
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struct pt_regs *regs = task_pt_regs(task);
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/*
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* If the user value contains TF, mark that
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* it was not "us" (the debugger) that set it.
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* If not, make sure it stays set if we had.
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*/
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if (value & X86_EFLAGS_TF)
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clear_tsk_thread_flag(task, TIF_FORCED_TF);
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else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
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value |= X86_EFLAGS_TF;
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regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
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return 0;
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}
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static int putreg(struct task_struct *child,
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unsigned long offset, unsigned long value)
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{
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switch (offset) {
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case offsetof(struct user_regs_struct, cs):
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case offsetof(struct user_regs_struct, ds):
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case offsetof(struct user_regs_struct, es):
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case offsetof(struct user_regs_struct, fs):
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case offsetof(struct user_regs_struct, gs):
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case offsetof(struct user_regs_struct, ss):
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return set_segment_reg(child, offset, value);
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case offsetof(struct user_regs_struct, flags):
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return set_flags(child, value);
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#ifdef CONFIG_X86_64
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/*
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* Orig_ax is really just a flag with small positive and
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* negative values, so make sure to always sign-extend it
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* from 32 bits so that it works correctly regardless of
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* whether we come from a 32-bit environment or not.
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*/
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case offsetof(struct user_regs_struct, orig_ax):
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value = (long) (s32) value;
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break;
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case offsetof(struct user_regs_struct,fs_base):
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if (value >= TASK_SIZE_OF(child))
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return -EIO;
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/*
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* When changing the segment base, use do_arch_prctl
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* to set either thread.fs or thread.fsindex and the
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* corresponding GDT slot.
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*/
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if (child->thread.fs != value)
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return do_arch_prctl(child, ARCH_SET_FS, value);
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return 0;
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case offsetof(struct user_regs_struct,gs_base):
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/*
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* Exactly the same here as the %fs handling above.
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*/
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if (value >= TASK_SIZE_OF(child))
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return -EIO;
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if (child->thread.gs != value)
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return do_arch_prctl(child, ARCH_SET_GS, value);
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return 0;
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#endif
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}
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*pt_regs_access(task_pt_regs(child), offset) = value;
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return 0;
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}
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static unsigned long getreg(struct task_struct *task, unsigned long offset)
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{
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switch (offset) {
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case offsetof(struct user_regs_struct, cs):
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case offsetof(struct user_regs_struct, ds):
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case offsetof(struct user_regs_struct, es):
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case offsetof(struct user_regs_struct, fs):
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case offsetof(struct user_regs_struct, gs):
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case offsetof(struct user_regs_struct, ss):
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return get_segment_reg(task, offset);
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case offsetof(struct user_regs_struct, flags):
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return get_flags(task);
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#ifdef CONFIG_X86_64
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case offsetof(struct user_regs_struct, fs_base): {
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/*
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* do_arch_prctl may have used a GDT slot instead of
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* the MSR. To userland, it appears the same either
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* way, except the %fs segment selector might not be 0.
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*/
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unsigned int seg = task->thread.fsindex;
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if (task->thread.fs != 0)
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return task->thread.fs;
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if (task == current)
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asm("movl %%fs,%0" : "=r" (seg));
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if (seg != FS_TLS_SEL)
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return 0;
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return get_desc_base(&task->thread.tls_array[FS_TLS]);
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}
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case offsetof(struct user_regs_struct, gs_base): {
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/*
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* Exactly the same here as the %fs handling above.
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*/
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unsigned int seg = task->thread.gsindex;
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if (task->thread.gs != 0)
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return task->thread.gs;
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if (task == current)
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asm("movl %%gs,%0" : "=r" (seg));
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if (seg != GS_TLS_SEL)
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return 0;
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return get_desc_base(&task->thread.tls_array[GS_TLS]);
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}
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#endif
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}
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return *pt_regs_access(task_pt_regs(task), offset);
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}
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static int genregs_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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if (kbuf) {
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unsigned long *k = kbuf;
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while (count > 0) {
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*k++ = getreg(target, pos);
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count -= sizeof(*k);
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pos += sizeof(*k);
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}
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} else {
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unsigned long __user *u = ubuf;
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while (count > 0) {
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if (__put_user(getreg(target, pos), u++))
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return -EFAULT;
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count -= sizeof(*u);
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pos += sizeof(*u);
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}
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}
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return 0;
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}
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static int genregs_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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int ret = 0;
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if (kbuf) {
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const unsigned long *k = kbuf;
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while (count > 0 && !ret) {
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ret = putreg(target, pos, *k++);
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count -= sizeof(*k);
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pos += sizeof(*k);
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}
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} else {
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const unsigned long __user *u = ubuf;
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while (count > 0 && !ret) {
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unsigned long word;
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ret = __get_user(word, u++);
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if (ret)
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break;
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ret = putreg(target, pos, word);
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count -= sizeof(*u);
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pos += sizeof(*u);
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}
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}
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return ret;
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}
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/*
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* This function is trivial and will be inlined by the compiler.
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* Having it separates the implementation details of debug
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* registers from the interface details of ptrace.
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*/
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static unsigned long ptrace_get_debugreg(struct task_struct *child, int n)
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{
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switch (n) {
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case 0: return child->thread.debugreg0;
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case 1: return child->thread.debugreg1;
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case 2: return child->thread.debugreg2;
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case 3: return child->thread.debugreg3;
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case 6: return child->thread.debugreg6;
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case 7: return child->thread.debugreg7;
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}
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return 0;
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}
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static int ptrace_set_debugreg(struct task_struct *child,
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int n, unsigned long data)
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{
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int i;
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if (unlikely(n == 4 || n == 5))
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return -EIO;
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if (n < 4 && unlikely(data >= debugreg_addr_limit(child)))
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return -EIO;
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switch (n) {
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case 0: child->thread.debugreg0 = data; break;
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case 1: child->thread.debugreg1 = data; break;
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case 2: child->thread.debugreg2 = data; break;
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case 3: child->thread.debugreg3 = data; break;
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case 6:
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if ((data & ~0xffffffffUL) != 0)
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return -EIO;
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child->thread.debugreg6 = data;
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break;
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case 7:
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/*
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* Sanity-check data. Take one half-byte at once with
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* check = (val >> (16 + 4*i)) & 0xf. It contains the
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* R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits
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* 2 and 3 are LENi. Given a list of invalid values,
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* we do mask |= 1 << invalid_value, so that
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* (mask >> check) & 1 is a correct test for invalid
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* values.
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*
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* R/Wi contains the type of the breakpoint /
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|
* watchpoint, LENi contains the length of the watched
|
|
* data in the watchpoint case.
|
|
*
|
|
* The invalid values are:
|
|
* - LENi == 0x10 (undefined), so mask |= 0x0f00. [32-bit]
|
|
* - R/Wi == 0x10 (break on I/O reads or writes), so
|
|
* mask |= 0x4444.
|
|
* - R/Wi == 0x00 && LENi != 0x00, so we have mask |=
|
|
* 0x1110.
|
|
*
|
|
* Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54.
|
|
*
|
|
* See the Intel Manual "System Programming Guide",
|
|
* 15.2.4
|
|
*
|
|
* Note that LENi == 0x10 is defined on x86_64 in long
|
|
* mode (i.e. even for 32-bit userspace software, but
|
|
* 64-bit kernel), so the x86_64 mask value is 0x5454.
|
|
* See the AMD manual no. 24593 (AMD64 System Programming)
|
|
*/
|
|
#ifdef CONFIG_X86_32
|
|
#define DR7_MASK 0x5f54
|
|
#else
|
|
#define DR7_MASK 0x5554
|
|
#endif
|
|
data &= ~DR_CONTROL_RESERVED;
|
|
for (i = 0; i < 4; i++)
|
|
if ((DR7_MASK >> ((data >> (16 + 4*i)) & 0xf)) & 1)
|
|
return -EIO;
|
|
child->thread.debugreg7 = data;
|
|
if (data)
|
|
set_tsk_thread_flag(child, TIF_DEBUG);
|
|
else
|
|
clear_tsk_thread_flag(child, TIF_DEBUG);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* These access the current or another (stopped) task's io permission
|
|
* bitmap for debugging or core dump.
|
|
*/
|
|
static int ioperm_active(struct task_struct *target,
|
|
const struct user_regset *regset)
|
|
{
|
|
return target->thread.io_bitmap_max / regset->size;
|
|
}
|
|
|
|
static int ioperm_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
if (!target->thread.io_bitmap_ptr)
|
|
return -ENXIO;
|
|
|
|
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
|
target->thread.io_bitmap_ptr,
|
|
0, IO_BITMAP_BYTES);
|
|
}
|
|
|
|
#ifdef CONFIG_X86_PTRACE_BTS
|
|
static int ptrace_bts_read_record(struct task_struct *child, size_t index,
|
|
struct bts_struct __user *out)
|
|
{
|
|
const struct bts_trace *trace;
|
|
struct bts_struct bts;
|
|
const unsigned char *at;
|
|
int error;
|
|
|
|
trace = ds_read_bts(child->bts);
|
|
if (!trace)
|
|
return -EPERM;
|
|
|
|
at = trace->ds.top - ((index + 1) * trace->ds.size);
|
|
if ((void *)at < trace->ds.begin)
|
|
at += (trace->ds.n * trace->ds.size);
|
|
|
|
if (!trace->read)
|
|
return -EOPNOTSUPP;
|
|
|
|
error = trace->read(child->bts, at, &bts);
|
|
if (error < 0)
|
|
return error;
|
|
|
|
if (copy_to_user(out, &bts, sizeof(bts)))
|
|
return -EFAULT;
|
|
|
|
return sizeof(bts);
|
|
}
|
|
|
|
static int ptrace_bts_drain(struct task_struct *child,
|
|
long size,
|
|
struct bts_struct __user *out)
|
|
{
|
|
const struct bts_trace *trace;
|
|
const unsigned char *at;
|
|
int error, drained = 0;
|
|
|
|
trace = ds_read_bts(child->bts);
|
|
if (!trace)
|
|
return -EPERM;
|
|
|
|
if (!trace->read)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (size < (trace->ds.top - trace->ds.begin))
|
|
return -EIO;
|
|
|
|
for (at = trace->ds.begin; (void *)at < trace->ds.top;
|
|
out++, drained++, at += trace->ds.size) {
|
|
struct bts_struct bts;
|
|
int error;
|
|
|
|
error = trace->read(child->bts, at, &bts);
|
|
if (error < 0)
|
|
return error;
|
|
|
|
if (copy_to_user(out, &bts, sizeof(bts)))
|
|
return -EFAULT;
|
|
}
|
|
|
|
memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size);
|
|
|
|
error = ds_reset_bts(child->bts);
|
|
if (error < 0)
|
|
return error;
|
|
|
|
return drained;
|
|
}
|
|
|
|
static int ptrace_bts_allocate_buffer(struct task_struct *child, size_t size)
|
|
{
|
|
child->bts_buffer = alloc_locked_buffer(size);
|
|
if (!child->bts_buffer)
|
|
return -ENOMEM;
|
|
|
|
child->bts_size = size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ptrace_bts_free_buffer(struct task_struct *child)
|
|
{
|
|
free_locked_buffer(child->bts_buffer, child->bts_size);
|
|
child->bts_buffer = NULL;
|
|
child->bts_size = 0;
|
|
}
|
|
|
|
static int ptrace_bts_config(struct task_struct *child,
|
|
long cfg_size,
|
|
const struct ptrace_bts_config __user *ucfg)
|
|
{
|
|
struct ptrace_bts_config cfg;
|
|
unsigned int flags = 0;
|
|
|
|
if (cfg_size < sizeof(cfg))
|
|
return -EIO;
|
|
|
|
if (copy_from_user(&cfg, ucfg, sizeof(cfg)))
|
|
return -EFAULT;
|
|
|
|
if (child->bts) {
|
|
ds_release_bts(child->bts);
|
|
child->bts = NULL;
|
|
}
|
|
|
|
if (cfg.flags & PTRACE_BTS_O_SIGNAL) {
|
|
if (!cfg.signal)
|
|
return -EINVAL;
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
child->thread.bts_ovfl_signal = cfg.signal;
|
|
}
|
|
|
|
if ((cfg.flags & PTRACE_BTS_O_ALLOC) &&
|
|
(cfg.size != child->bts_size)) {
|
|
int error;
|
|
|
|
ptrace_bts_free_buffer(child);
|
|
|
|
error = ptrace_bts_allocate_buffer(child, cfg.size);
|
|
if (error < 0)
|
|
return error;
|
|
}
|
|
|
|
if (cfg.flags & PTRACE_BTS_O_TRACE)
|
|
flags |= BTS_USER;
|
|
|
|
if (cfg.flags & PTRACE_BTS_O_SCHED)
|
|
flags |= BTS_TIMESTAMPS;
|
|
|
|
child->bts = ds_request_bts(child, child->bts_buffer, child->bts_size,
|
|
/* ovfl = */ NULL, /* th = */ (size_t)-1,
|
|
flags);
|
|
if (IS_ERR(child->bts)) {
|
|
int error = PTR_ERR(child->bts);
|
|
|
|
ptrace_bts_free_buffer(child);
|
|
child->bts = NULL;
|
|
|
|
return error;
|
|
}
|
|
|
|
return sizeof(cfg);
|
|
}
|
|
|
|
static int ptrace_bts_status(struct task_struct *child,
|
|
long cfg_size,
|
|
struct ptrace_bts_config __user *ucfg)
|
|
{
|
|
const struct bts_trace *trace;
|
|
struct ptrace_bts_config cfg;
|
|
|
|
if (cfg_size < sizeof(cfg))
|
|
return -EIO;
|
|
|
|
trace = ds_read_bts(child->bts);
|
|
if (!trace)
|
|
return -EPERM;
|
|
|
|
memset(&cfg, 0, sizeof(cfg));
|
|
cfg.size = trace->ds.end - trace->ds.begin;
|
|
cfg.signal = child->thread.bts_ovfl_signal;
|
|
cfg.bts_size = sizeof(struct bts_struct);
|
|
|
|
if (cfg.signal)
|
|
cfg.flags |= PTRACE_BTS_O_SIGNAL;
|
|
|
|
if (trace->ds.flags & BTS_USER)
|
|
cfg.flags |= PTRACE_BTS_O_TRACE;
|
|
|
|
if (trace->ds.flags & BTS_TIMESTAMPS)
|
|
cfg.flags |= PTRACE_BTS_O_SCHED;
|
|
|
|
if (copy_to_user(ucfg, &cfg, sizeof(cfg)))
|
|
return -EFAULT;
|
|
|
|
return sizeof(cfg);
|
|
}
|
|
|
|
static int ptrace_bts_clear(struct task_struct *child)
|
|
{
|
|
const struct bts_trace *trace;
|
|
|
|
trace = ds_read_bts(child->bts);
|
|
if (!trace)
|
|
return -EPERM;
|
|
|
|
memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size);
|
|
|
|
return ds_reset_bts(child->bts);
|
|
}
|
|
|
|
static int ptrace_bts_size(struct task_struct *child)
|
|
{
|
|
const struct bts_trace *trace;
|
|
|
|
trace = ds_read_bts(child->bts);
|
|
if (!trace)
|
|
return -EPERM;
|
|
|
|
return (trace->ds.top - trace->ds.begin) / trace->ds.size;
|
|
}
|
|
|
|
static void ptrace_bts_fork(struct task_struct *tsk)
|
|
{
|
|
tsk->bts = NULL;
|
|
tsk->bts_buffer = NULL;
|
|
tsk->bts_size = 0;
|
|
tsk->thread.bts_ovfl_signal = 0;
|
|
}
|
|
|
|
static void ptrace_bts_untrace(struct task_struct *child)
|
|
{
|
|
if (unlikely(child->bts)) {
|
|
ds_release_bts(child->bts);
|
|
child->bts = NULL;
|
|
|
|
/* We cannot update total_vm and locked_vm since
|
|
child's mm is already gone. But we can reclaim the
|
|
memory. */
|
|
kfree(child->bts_buffer);
|
|
child->bts_buffer = NULL;
|
|
child->bts_size = 0;
|
|
}
|
|
}
|
|
|
|
static void ptrace_bts_detach(struct task_struct *child)
|
|
{
|
|
if (unlikely(child->bts)) {
|
|
ds_release_bts(child->bts);
|
|
child->bts = NULL;
|
|
|
|
ptrace_bts_free_buffer(child);
|
|
}
|
|
}
|
|
#else
|
|
static inline void ptrace_bts_fork(struct task_struct *tsk) {}
|
|
static inline void ptrace_bts_detach(struct task_struct *child) {}
|
|
static inline void ptrace_bts_untrace(struct task_struct *child) {}
|
|
#endif /* CONFIG_X86_PTRACE_BTS */
|
|
|
|
void x86_ptrace_fork(struct task_struct *child, unsigned long clone_flags)
|
|
{
|
|
ptrace_bts_fork(child);
|
|
}
|
|
|
|
void x86_ptrace_untrace(struct task_struct *child)
|
|
{
|
|
ptrace_bts_untrace(child);
|
|
}
|
|
|
|
/*
|
|
* Called by kernel/ptrace.c when detaching..
|
|
*
|
|
* Make sure the single step bit is not set.
|
|
*/
|
|
void ptrace_disable(struct task_struct *child)
|
|
{
|
|
user_disable_single_step(child);
|
|
#ifdef TIF_SYSCALL_EMU
|
|
clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
|
|
#endif
|
|
ptrace_bts_detach(child);
|
|
}
|
|
|
|
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
|
|
static const struct user_regset_view user_x86_32_view; /* Initialized below. */
|
|
#endif
|
|
|
|
long arch_ptrace(struct task_struct *child, long request, long addr, long data)
|
|
{
|
|
int ret;
|
|
unsigned long __user *datap = (unsigned long __user *)data;
|
|
|
|
switch (request) {
|
|
/* read the word at location addr in the USER area. */
|
|
case PTRACE_PEEKUSR: {
|
|
unsigned long tmp;
|
|
|
|
ret = -EIO;
|
|
if ((addr & (sizeof(data) - 1)) || addr < 0 ||
|
|
addr >= sizeof(struct user))
|
|
break;
|
|
|
|
tmp = 0; /* Default return condition */
|
|
if (addr < sizeof(struct user_regs_struct))
|
|
tmp = getreg(child, addr);
|
|
else if (addr >= offsetof(struct user, u_debugreg[0]) &&
|
|
addr <= offsetof(struct user, u_debugreg[7])) {
|
|
addr -= offsetof(struct user, u_debugreg[0]);
|
|
tmp = ptrace_get_debugreg(child, addr / sizeof(data));
|
|
}
|
|
ret = put_user(tmp, datap);
|
|
break;
|
|
}
|
|
|
|
case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
|
|
ret = -EIO;
|
|
if ((addr & (sizeof(data) - 1)) || addr < 0 ||
|
|
addr >= sizeof(struct user))
|
|
break;
|
|
|
|
if (addr < sizeof(struct user_regs_struct))
|
|
ret = putreg(child, addr, data);
|
|
else if (addr >= offsetof(struct user, u_debugreg[0]) &&
|
|
addr <= offsetof(struct user, u_debugreg[7])) {
|
|
addr -= offsetof(struct user, u_debugreg[0]);
|
|
ret = ptrace_set_debugreg(child,
|
|
addr / sizeof(data), data);
|
|
}
|
|
break;
|
|
|
|
case PTRACE_GETREGS: /* Get all gp regs from the child. */
|
|
return copy_regset_to_user(child,
|
|
task_user_regset_view(current),
|
|
REGSET_GENERAL,
|
|
0, sizeof(struct user_regs_struct),
|
|
datap);
|
|
|
|
case PTRACE_SETREGS: /* Set all gp regs in the child. */
|
|
return copy_regset_from_user(child,
|
|
task_user_regset_view(current),
|
|
REGSET_GENERAL,
|
|
0, sizeof(struct user_regs_struct),
|
|
datap);
|
|
|
|
case PTRACE_GETFPREGS: /* Get the child FPU state. */
|
|
return copy_regset_to_user(child,
|
|
task_user_regset_view(current),
|
|
REGSET_FP,
|
|
0, sizeof(struct user_i387_struct),
|
|
datap);
|
|
|
|
case PTRACE_SETFPREGS: /* Set the child FPU state. */
|
|
return copy_regset_from_user(child,
|
|
task_user_regset_view(current),
|
|
REGSET_FP,
|
|
0, sizeof(struct user_i387_struct),
|
|
datap);
|
|
|
|
#ifdef CONFIG_X86_32
|
|
case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
|
|
return copy_regset_to_user(child, &user_x86_32_view,
|
|
REGSET_XFP,
|
|
0, sizeof(struct user_fxsr_struct),
|
|
datap) ? -EIO : 0;
|
|
|
|
case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
|
|
return copy_regset_from_user(child, &user_x86_32_view,
|
|
REGSET_XFP,
|
|
0, sizeof(struct user_fxsr_struct),
|
|
datap) ? -EIO : 0;
|
|
#endif
|
|
|
|
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
|
|
case PTRACE_GET_THREAD_AREA:
|
|
if (addr < 0)
|
|
return -EIO;
|
|
ret = do_get_thread_area(child, addr,
|
|
(struct user_desc __user *) data);
|
|
break;
|
|
|
|
case PTRACE_SET_THREAD_AREA:
|
|
if (addr < 0)
|
|
return -EIO;
|
|
ret = do_set_thread_area(child, addr,
|
|
(struct user_desc __user *) data, 0);
|
|
break;
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_64
|
|
/* normal 64bit interface to access TLS data.
|
|
Works just like arch_prctl, except that the arguments
|
|
are reversed. */
|
|
case PTRACE_ARCH_PRCTL:
|
|
ret = do_arch_prctl(child, data, addr);
|
|
break;
|
|
#endif
|
|
|
|
/*
|
|
* These bits need more cooking - not enabled yet:
|
|
*/
|
|
#ifdef CONFIG_X86_PTRACE_BTS
|
|
case PTRACE_BTS_CONFIG:
|
|
ret = ptrace_bts_config
|
|
(child, data, (struct ptrace_bts_config __user *)addr);
|
|
break;
|
|
|
|
case PTRACE_BTS_STATUS:
|
|
ret = ptrace_bts_status
|
|
(child, data, (struct ptrace_bts_config __user *)addr);
|
|
break;
|
|
|
|
case PTRACE_BTS_SIZE:
|
|
ret = ptrace_bts_size(child);
|
|
break;
|
|
|
|
case PTRACE_BTS_GET:
|
|
ret = ptrace_bts_read_record
|
|
(child, data, (struct bts_struct __user *) addr);
|
|
break;
|
|
|
|
case PTRACE_BTS_CLEAR:
|
|
ret = ptrace_bts_clear(child);
|
|
break;
|
|
|
|
case PTRACE_BTS_DRAIN:
|
|
ret = ptrace_bts_drain
|
|
(child, data, (struct bts_struct __user *) addr);
|
|
break;
|
|
#endif /* CONFIG_X86_PTRACE_BTS */
|
|
|
|
default:
|
|
ret = ptrace_request(child, request, addr, data);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_IA32_EMULATION
|
|
|
|
#include <linux/compat.h>
|
|
#include <linux/syscalls.h>
|
|
#include <asm/ia32.h>
|
|
#include <asm/user32.h>
|
|
|
|
#define R32(l,q) \
|
|
case offsetof(struct user32, regs.l): \
|
|
regs->q = value; break
|
|
|
|
#define SEG32(rs) \
|
|
case offsetof(struct user32, regs.rs): \
|
|
return set_segment_reg(child, \
|
|
offsetof(struct user_regs_struct, rs), \
|
|
value); \
|
|
break
|
|
|
|
static int putreg32(struct task_struct *child, unsigned regno, u32 value)
|
|
{
|
|
struct pt_regs *regs = task_pt_regs(child);
|
|
|
|
switch (regno) {
|
|
|
|
SEG32(cs);
|
|
SEG32(ds);
|
|
SEG32(es);
|
|
SEG32(fs);
|
|
SEG32(gs);
|
|
SEG32(ss);
|
|
|
|
R32(ebx, bx);
|
|
R32(ecx, cx);
|
|
R32(edx, dx);
|
|
R32(edi, di);
|
|
R32(esi, si);
|
|
R32(ebp, bp);
|
|
R32(eax, ax);
|
|
R32(eip, ip);
|
|
R32(esp, sp);
|
|
|
|
case offsetof(struct user32, regs.orig_eax):
|
|
/*
|
|
* Sign-extend the value so that orig_eax = -1
|
|
* causes (long)orig_ax < 0 tests to fire correctly.
|
|
*/
|
|
regs->orig_ax = (long) (s32) value;
|
|
break;
|
|
|
|
case offsetof(struct user32, regs.eflags):
|
|
return set_flags(child, value);
|
|
|
|
case offsetof(struct user32, u_debugreg[0]) ...
|
|
offsetof(struct user32, u_debugreg[7]):
|
|
regno -= offsetof(struct user32, u_debugreg[0]);
|
|
return ptrace_set_debugreg(child, regno / 4, value);
|
|
|
|
default:
|
|
if (regno > sizeof(struct user32) || (regno & 3))
|
|
return -EIO;
|
|
|
|
/*
|
|
* Other dummy fields in the virtual user structure
|
|
* are ignored
|
|
*/
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#undef R32
|
|
#undef SEG32
|
|
|
|
#define R32(l,q) \
|
|
case offsetof(struct user32, regs.l): \
|
|
*val = regs->q; break
|
|
|
|
#define SEG32(rs) \
|
|
case offsetof(struct user32, regs.rs): \
|
|
*val = get_segment_reg(child, \
|
|
offsetof(struct user_regs_struct, rs)); \
|
|
break
|
|
|
|
static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
|
|
{
|
|
struct pt_regs *regs = task_pt_regs(child);
|
|
|
|
switch (regno) {
|
|
|
|
SEG32(ds);
|
|
SEG32(es);
|
|
SEG32(fs);
|
|
SEG32(gs);
|
|
|
|
R32(cs, cs);
|
|
R32(ss, ss);
|
|
R32(ebx, bx);
|
|
R32(ecx, cx);
|
|
R32(edx, dx);
|
|
R32(edi, di);
|
|
R32(esi, si);
|
|
R32(ebp, bp);
|
|
R32(eax, ax);
|
|
R32(orig_eax, orig_ax);
|
|
R32(eip, ip);
|
|
R32(esp, sp);
|
|
|
|
case offsetof(struct user32, regs.eflags):
|
|
*val = get_flags(child);
|
|
break;
|
|
|
|
case offsetof(struct user32, u_debugreg[0]) ...
|
|
offsetof(struct user32, u_debugreg[7]):
|
|
regno -= offsetof(struct user32, u_debugreg[0]);
|
|
*val = ptrace_get_debugreg(child, regno / 4);
|
|
break;
|
|
|
|
default:
|
|
if (regno > sizeof(struct user32) || (regno & 3))
|
|
return -EIO;
|
|
|
|
/*
|
|
* Other dummy fields in the virtual user structure
|
|
* are ignored
|
|
*/
|
|
*val = 0;
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#undef R32
|
|
#undef SEG32
|
|
|
|
static int genregs32_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
if (kbuf) {
|
|
compat_ulong_t *k = kbuf;
|
|
while (count > 0) {
|
|
getreg32(target, pos, k++);
|
|
count -= sizeof(*k);
|
|
pos += sizeof(*k);
|
|
}
|
|
} else {
|
|
compat_ulong_t __user *u = ubuf;
|
|
while (count > 0) {
|
|
compat_ulong_t word;
|
|
getreg32(target, pos, &word);
|
|
if (__put_user(word, u++))
|
|
return -EFAULT;
|
|
count -= sizeof(*u);
|
|
pos += sizeof(*u);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int genregs32_set(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
|
|
{
|
|
int ret = 0;
|
|
if (kbuf) {
|
|
const compat_ulong_t *k = kbuf;
|
|
while (count > 0 && !ret) {
|
|
ret = putreg32(target, pos, *k++);
|
|
count -= sizeof(*k);
|
|
pos += sizeof(*k);
|
|
}
|
|
} else {
|
|
const compat_ulong_t __user *u = ubuf;
|
|
while (count > 0 && !ret) {
|
|
compat_ulong_t word;
|
|
ret = __get_user(word, u++);
|
|
if (ret)
|
|
break;
|
|
ret = putreg32(target, pos, word);
|
|
count -= sizeof(*u);
|
|
pos += sizeof(*u);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
|
|
compat_ulong_t caddr, compat_ulong_t cdata)
|
|
{
|
|
unsigned long addr = caddr;
|
|
unsigned long data = cdata;
|
|
void __user *datap = compat_ptr(data);
|
|
int ret;
|
|
__u32 val;
|
|
|
|
switch (request) {
|
|
case PTRACE_PEEKUSR:
|
|
ret = getreg32(child, addr, &val);
|
|
if (ret == 0)
|
|
ret = put_user(val, (__u32 __user *)datap);
|
|
break;
|
|
|
|
case PTRACE_POKEUSR:
|
|
ret = putreg32(child, addr, data);
|
|
break;
|
|
|
|
case PTRACE_GETREGS: /* Get all gp regs from the child. */
|
|
return copy_regset_to_user(child, &user_x86_32_view,
|
|
REGSET_GENERAL,
|
|
0, sizeof(struct user_regs_struct32),
|
|
datap);
|
|
|
|
case PTRACE_SETREGS: /* Set all gp regs in the child. */
|
|
return copy_regset_from_user(child, &user_x86_32_view,
|
|
REGSET_GENERAL, 0,
|
|
sizeof(struct user_regs_struct32),
|
|
datap);
|
|
|
|
case PTRACE_GETFPREGS: /* Get the child FPU state. */
|
|
return copy_regset_to_user(child, &user_x86_32_view,
|
|
REGSET_FP, 0,
|
|
sizeof(struct user_i387_ia32_struct),
|
|
datap);
|
|
|
|
case PTRACE_SETFPREGS: /* Set the child FPU state. */
|
|
return copy_regset_from_user(
|
|
child, &user_x86_32_view, REGSET_FP,
|
|
0, sizeof(struct user_i387_ia32_struct), datap);
|
|
|
|
case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
|
|
return copy_regset_to_user(child, &user_x86_32_view,
|
|
REGSET_XFP, 0,
|
|
sizeof(struct user32_fxsr_struct),
|
|
datap);
|
|
|
|
case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
|
|
return copy_regset_from_user(child, &user_x86_32_view,
|
|
REGSET_XFP, 0,
|
|
sizeof(struct user32_fxsr_struct),
|
|
datap);
|
|
|
|
case PTRACE_GET_THREAD_AREA:
|
|
case PTRACE_SET_THREAD_AREA:
|
|
#ifdef CONFIG_X86_PTRACE_BTS
|
|
case PTRACE_BTS_CONFIG:
|
|
case PTRACE_BTS_STATUS:
|
|
case PTRACE_BTS_SIZE:
|
|
case PTRACE_BTS_GET:
|
|
case PTRACE_BTS_CLEAR:
|
|
case PTRACE_BTS_DRAIN:
|
|
#endif /* CONFIG_X86_PTRACE_BTS */
|
|
return arch_ptrace(child, request, addr, data);
|
|
|
|
default:
|
|
return compat_ptrace_request(child, request, addr, data);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_IA32_EMULATION */
|
|
|
|
#ifdef CONFIG_X86_64
|
|
|
|
static const struct user_regset x86_64_regsets[] = {
|
|
[REGSET_GENERAL] = {
|
|
.core_note_type = NT_PRSTATUS,
|
|
.n = sizeof(struct user_regs_struct) / sizeof(long),
|
|
.size = sizeof(long), .align = sizeof(long),
|
|
.get = genregs_get, .set = genregs_set
|
|
},
|
|
[REGSET_FP] = {
|
|
.core_note_type = NT_PRFPREG,
|
|
.n = sizeof(struct user_i387_struct) / sizeof(long),
|
|
.size = sizeof(long), .align = sizeof(long),
|
|
.active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
|
|
},
|
|
[REGSET_IOPERM64] = {
|
|
.core_note_type = NT_386_IOPERM,
|
|
.n = IO_BITMAP_LONGS,
|
|
.size = sizeof(long), .align = sizeof(long),
|
|
.active = ioperm_active, .get = ioperm_get
|
|
},
|
|
};
|
|
|
|
static const struct user_regset_view user_x86_64_view = {
|
|
.name = "x86_64", .e_machine = EM_X86_64,
|
|
.regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
|
|
};
|
|
|
|
#else /* CONFIG_X86_32 */
|
|
|
|
#define user_regs_struct32 user_regs_struct
|
|
#define genregs32_get genregs_get
|
|
#define genregs32_set genregs_set
|
|
|
|
#define user_i387_ia32_struct user_i387_struct
|
|
#define user32_fxsr_struct user_fxsr_struct
|
|
|
|
#endif /* CONFIG_X86_64 */
|
|
|
|
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
|
|
static const struct user_regset x86_32_regsets[] = {
|
|
[REGSET_GENERAL] = {
|
|
.core_note_type = NT_PRSTATUS,
|
|
.n = sizeof(struct user_regs_struct32) / sizeof(u32),
|
|
.size = sizeof(u32), .align = sizeof(u32),
|
|
.get = genregs32_get, .set = genregs32_set
|
|
},
|
|
[REGSET_FP] = {
|
|
.core_note_type = NT_PRFPREG,
|
|
.n = sizeof(struct user_i387_ia32_struct) / sizeof(u32),
|
|
.size = sizeof(u32), .align = sizeof(u32),
|
|
.active = fpregs_active, .get = fpregs_get, .set = fpregs_set
|
|
},
|
|
[REGSET_XFP] = {
|
|
.core_note_type = NT_PRXFPREG,
|
|
.n = sizeof(struct user32_fxsr_struct) / sizeof(u32),
|
|
.size = sizeof(u32), .align = sizeof(u32),
|
|
.active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
|
|
},
|
|
[REGSET_TLS] = {
|
|
.core_note_type = NT_386_TLS,
|
|
.n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
|
|
.size = sizeof(struct user_desc),
|
|
.align = sizeof(struct user_desc),
|
|
.active = regset_tls_active,
|
|
.get = regset_tls_get, .set = regset_tls_set
|
|
},
|
|
[REGSET_IOPERM32] = {
|
|
.core_note_type = NT_386_IOPERM,
|
|
.n = IO_BITMAP_BYTES / sizeof(u32),
|
|
.size = sizeof(u32), .align = sizeof(u32),
|
|
.active = ioperm_active, .get = ioperm_get
|
|
},
|
|
};
|
|
|
|
static const struct user_regset_view user_x86_32_view = {
|
|
.name = "i386", .e_machine = EM_386,
|
|
.regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
|
|
};
|
|
#endif
|
|
|
|
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
|
|
{
|
|
#ifdef CONFIG_IA32_EMULATION
|
|
if (test_tsk_thread_flag(task, TIF_IA32))
|
|
#endif
|
|
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
|
|
return &user_x86_32_view;
|
|
#endif
|
|
#ifdef CONFIG_X86_64
|
|
return &user_x86_64_view;
|
|
#endif
|
|
}
|
|
|
|
void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
|
|
int error_code, int si_code)
|
|
{
|
|
struct siginfo info;
|
|
|
|
tsk->thread.trap_no = 1;
|
|
tsk->thread.error_code = error_code;
|
|
|
|
memset(&info, 0, sizeof(info));
|
|
info.si_signo = SIGTRAP;
|
|
info.si_code = si_code;
|
|
|
|
/* User-mode ip? */
|
|
info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL;
|
|
|
|
/* Send us the fake SIGTRAP */
|
|
force_sig_info(SIGTRAP, &info, tsk);
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_X86_32
|
|
# define IS_IA32 1
|
|
#elif defined CONFIG_IA32_EMULATION
|
|
# define IS_IA32 test_thread_flag(TIF_IA32)
|
|
#else
|
|
# define IS_IA32 0
|
|
#endif
|
|
|
|
/*
|
|
* We must return the syscall number to actually look up in the table.
|
|
* This can be -1L to skip running any syscall at all.
|
|
*/
|
|
asmregparm long syscall_trace_enter(struct pt_regs *regs)
|
|
{
|
|
long ret = 0;
|
|
|
|
/*
|
|
* If we stepped into a sysenter/syscall insn, it trapped in
|
|
* kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP.
|
|
* If user-mode had set TF itself, then it's still clear from
|
|
* do_debug() and we need to set it again to restore the user
|
|
* state. If we entered on the slow path, TF was already set.
|
|
*/
|
|
if (test_thread_flag(TIF_SINGLESTEP))
|
|
regs->flags |= X86_EFLAGS_TF;
|
|
|
|
/* do the secure computing check first */
|
|
secure_computing(regs->orig_ax);
|
|
|
|
if (unlikely(test_thread_flag(TIF_SYSCALL_EMU)))
|
|
ret = -1L;
|
|
|
|
if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) &&
|
|
tracehook_report_syscall_entry(regs))
|
|
ret = -1L;
|
|
|
|
if (unlikely(current->audit_context)) {
|
|
if (IS_IA32)
|
|
audit_syscall_entry(AUDIT_ARCH_I386,
|
|
regs->orig_ax,
|
|
regs->bx, regs->cx,
|
|
regs->dx, regs->si);
|
|
#ifdef CONFIG_X86_64
|
|
else
|
|
audit_syscall_entry(AUDIT_ARCH_X86_64,
|
|
regs->orig_ax,
|
|
regs->di, regs->si,
|
|
regs->dx, regs->r10);
|
|
#endif
|
|
}
|
|
|
|
return ret ?: regs->orig_ax;
|
|
}
|
|
|
|
asmregparm void syscall_trace_leave(struct pt_regs *regs)
|
|
{
|
|
if (unlikely(current->audit_context))
|
|
audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE))
|
|
tracehook_report_syscall_exit(regs, 0);
|
|
|
|
/*
|
|
* If TIF_SYSCALL_EMU is set, we only get here because of
|
|
* TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP).
|
|
* We already reported this syscall instruction in
|
|
* syscall_trace_enter(), so don't do any more now.
|
|
*/
|
|
if (unlikely(test_thread_flag(TIF_SYSCALL_EMU)))
|
|
return;
|
|
|
|
/*
|
|
* If we are single-stepping, synthesize a trap to follow the
|
|
* system call instruction.
|
|
*/
|
|
if (test_thread_flag(TIF_SINGLESTEP) &&
|
|
tracehook_consider_fatal_signal(current, SIGTRAP, SIG_DFL))
|
|
send_sigtrap(current, regs, 0, TRAP_BRKPT);
|
|
}
|