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generic compat_sys_sigaltstack() 

Again, conditional on CONFIG_GENERIC_SIGALTSTACK

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-12-14 14:47:53 -05:00
parent 6bf9adfc90
commit 9026843952
10 changed files with 67 additions and 67 deletions
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50
arch/x86/ia32/ia32_signal.c
View File

@ -136,52 +136,6 @@ asmlinkage long sys32_sigsuspend(int history0, int history1, old_sigset_t mask)
return sigsuspend(&blocked);
}
asmlinkage long sys32_sigaltstack(const stack_ia32_t __user *uss_ptr,
stack_ia32_t __user *uoss_ptr,
struct pt_regs *regs)
{
stack_t uss, uoss;
int ret, err = 0;
mm_segment_t seg;
if (uss_ptr) {
u32 ptr;
memset(&uss, 0, sizeof(stack_t));
if (!access_ok(VERIFY_READ, uss_ptr, sizeof(stack_ia32_t)))
return -EFAULT;
get_user_try {
get_user_ex(ptr, &uss_ptr->ss_sp);
get_user_ex(uss.ss_flags, &uss_ptr->ss_flags);
get_user_ex(uss.ss_size, &uss_ptr->ss_size);
} get_user_catch(err);
if (err)
return -EFAULT;
uss.ss_sp = compat_ptr(ptr);
}
seg = get_fs();
set_fs(KERNEL_DS);
ret = do_sigaltstack((stack_t __force __user *) (uss_ptr ? &uss : NULL),
(stack_t __force __user *) &uoss, regs->sp);
set_fs(seg);
if (ret >= 0 && uoss_ptr) {
if (!access_ok(VERIFY_WRITE, uoss_ptr, sizeof(stack_ia32_t)))
return -EFAULT;
put_user_try {
put_user_ex(ptr_to_compat(uoss.ss_sp), &uoss_ptr->ss_sp);
put_user_ex(uoss.ss_flags, &uoss_ptr->ss_flags);
put_user_ex(uoss.ss_size, &uoss_ptr->ss_size);
} put_user_catch(err);
if (err)
ret = -EFAULT;
}
return ret;
}
/*
* Do a signal return; undo the signal stack.
*/
@ -292,7 +246,6 @@ asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
struct rt_sigframe_ia32 __user *frame;
sigset_t set;
unsigned int ax;
struct pt_regs tregs;
frame = (struct rt_sigframe_ia32 __user *)(regs->sp - 4);
@ -306,8 +259,7 @@ asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
goto badframe;
tregs = *regs;
if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT)
if (compat_restore_altstack(&frame->uc.uc_stack))
goto badframe;
return ax;

1
arch/x86/ia32/ia32entry.S
View File

@ -464,7 +464,6 @@ GLOBAL(\label)
PTREGSCALL stub32_rt_sigreturn, sys32_rt_sigreturn, %rdi
PTREGSCALL stub32_sigreturn, sys32_sigreturn, %rdi
PTREGSCALL stub32_sigaltstack, sys32_sigaltstack, %rdx
PTREGSCALL stub32_execve, compat_sys_execve, %rcx
PTREGSCALL stub32_fork, sys_fork, %rdi
PTREGSCALL stub32_vfork, sys_vfork, %rdi

10
arch/x86/include/asm/ia32.h
View File

@ -29,16 +29,10 @@ struct old_sigaction32 {
unsigned int sa_restorer; /* Another 32 bit pointer */
};
typedef struct sigaltstack_ia32 {
unsigned int ss_sp;
int ss_flags;
unsigned int ss_size;
} stack_ia32_t;
struct ucontext_ia32 {
unsigned int uc_flags;
unsigned int uc_link;
stack_ia32_t uc_stack;
compat_stack_t uc_stack;
struct sigcontext_ia32 uc_mcontext;
compat_sigset_t uc_sigmask; /* mask last for extensibility */
};
@ -46,7 +40,7 @@ struct ucontext_ia32 {
struct ucontext_x32 {
unsigned int uc_flags;
unsigned int uc_link;
stack_ia32_t uc_stack;
compat_stack_t uc_stack;
unsigned int uc__pad0; /* needed for alignment */
struct sigcontext uc_mcontext; /* the 64-bit sigcontext type */
compat_sigset_t uc_sigmask; /* mask last for extensibility */

2
arch/x86/include/asm/sys_ia32.h
View File

@ -69,8 +69,6 @@ asmlinkage long sys32_fallocate(int, int, unsigned,
/* ia32/ia32_signal.c */
asmlinkage long sys32_sigsuspend(int, int, old_sigset_t);
asmlinkage long sys32_sigaltstack(const stack_ia32_t __user *,
stack_ia32_t __user *, struct pt_regs *);
asmlinkage long sys32_sigreturn(struct pt_regs *);
asmlinkage long sys32_rt_sigreturn(struct pt_regs *);

2
arch/x86/kernel/entry_64.S
View File

@ -912,8 +912,6 @@ ENTRY(stub_rt_sigreturn)
END(stub_rt_sigreturn)
#ifdef CONFIG_X86_X32_ABI
PTREGSCALL stub_x32_sigaltstack, sys32_sigaltstack, %rdx
ENTRY(stub_x32_rt_sigreturn)
CFI_STARTPROC
addq $8, %rsp

4
arch/x86/kernel/signal.c
View File

@ -857,7 +857,6 @@ asmlinkage long sys32_x32_rt_sigreturn(struct pt_regs *regs)
struct rt_sigframe_x32 __user *frame;
sigset_t set;
unsigned long ax;
struct pt_regs tregs;
frame = (struct rt_sigframe_x32 __user *)(regs->sp - 8);
@ -871,8 +870,7 @@ asmlinkage long sys32_x32_rt_sigreturn(struct pt_regs *regs)
if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
goto badframe;
tregs = *regs;
if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT)
if (compat_restore_altstack(&frame->uc.uc_stack))
goto badframe;
return ax;

2
arch/x86/syscalls/syscall_32.tbl
View File

@ -192,7 +192,7 @@
183 i386 getcwd sys_getcwd
184 i386 capget sys_capget
185 i386 capset sys_capset
186 i386 sigaltstack sys_sigaltstack stub32_sigaltstack
186 i386 sigaltstack sys_sigaltstack compat_sys_sigaltstack
187 i386 sendfile sys_sendfile sys32_sendfile
188 i386 getpmsg
189 i386 putpmsg

2
arch/x86/syscalls/syscall_64.tbl
View File

@ -337,7 +337,7 @@
522 x32 rt_sigpending sys32_rt_sigpending
523 x32 rt_sigtimedwait compat_sys_rt_sigtimedwait
524 x32 rt_sigqueueinfo sys32_rt_sigqueueinfo
525 x32 sigaltstack stub_x32_sigaltstack
525 x32 sigaltstack compat_sys_sigaltstack
526 x32 timer_create compat_sys_timer_create
527 x32 mq_notify compat_sys_mq_notify
528 x32 kexec_load compat_sys_kexec_load

16
include/linux/compat.h
View File

@ -68,6 +68,16 @@
#ifndef compat_user_stack_pointer
#define compat_user_stack_pointer() current_user_stack_pointer()
#endif
#ifdef CONFIG_GENERIC_SIGALTSTACK
#ifndef compat_sigaltstack /* we'll need that for MIPS */
typedef struct compat_sigaltstack {
compat_uptr_t ss_sp;
int ss_flags;
compat_size_t ss_size;
} compat_stack_t;
#endif
#endif
#define compat_jiffies_to_clock_t(x) \
(((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
@ -632,6 +642,12 @@ asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
asmlinkage long compat_sys_sendfile(int out_fd, int in_fd,
compat_off_t __user *offset, compat_size_t count);
#ifdef CONFIG_GENERIC_SIGALTSTACK
asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
compat_stack_t __user *uoss_ptr);
int compat_restore_altstack(const compat_stack_t __user *uss);
#endif
#else

45
kernel/signal.c
View File

@ -31,6 +31,7 @@
#include <linux/nsproxy.h>
#include <linux/user_namespace.h>
#include <linux/uprobes.h>
#include <linux/compat.h>
#define CREATE_TRACE_POINTS
#include <trace/events/signal.h>
@ -3116,6 +3117,50 @@ int restore_altstack(const stack_t __user *uss)
return err == -EFAULT ? err : 0;
}
#ifdef CONFIG_COMPAT
#ifdef CONFIG_GENERIC_SIGALTSTACK
asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
compat_stack_t __user *uoss_ptr)
{
stack_t uss, uoss;
int ret;
mm_segment_t seg;
if (uss_ptr) {
compat_stack_t uss32;
memset(&uss, 0, sizeof(stack_t));
if (copy_from_user(&uss32, uss_ptr, sizeof(compat_stack_t)))
return -EFAULT;
uss.ss_sp = compat_ptr(uss32.ss_sp);
uss.ss_flags = uss32.ss_flags;
uss.ss_size = uss32.ss_size;
}
seg = get_fs();
set_fs(KERNEL_DS);
ret = do_sigaltstack((stack_t __force __user *) (uss_ptr ? &uss : NULL),
(stack_t __force __user *) &uoss,
compat_user_stack_pointer());
set_fs(seg);
if (ret >= 0 && uoss_ptr) {
if (!access_ok(VERIFY_WRITE, uoss_ptr, sizeof(compat_stack_t)) ||
__put_user(ptr_to_compat(uoss.ss_sp), &uoss_ptr->ss_sp) ||
__put_user(uoss.ss_flags, &uoss_ptr->ss_flags) ||
__put_user(uoss.ss_size, &uoss_ptr->ss_size))
ret = -EFAULT;
}
return ret;
}
int compat_restore_altstack(const compat_stack_t __user *uss)
{
int err = compat_sys_sigaltstack(uss, NULL);
/* squash all but -EFAULT for now */
return err == -EFAULT ? err : 0;
}
#endif
#endif
#ifdef __ARCH_WANT_SYS_SIGPENDING
/**