2005-04-16 22:20:36 +00:00
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/*
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* linux/arch/parisc/kernel/signal.c: Architecture-specific signal
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* handling support.
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*
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* Copyright (C) 2000 David Huggins-Daines <dhd@debian.org>
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* Copyright (C) 2000 Linuxcare, Inc.
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*
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* Based on the ia64, i386, and alpha versions.
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*
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* Like the IA-64, we are a recent enough port (we are *starting*
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* with glibc2.2) that we do not need to support the old non-realtime
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* Linux signals. Therefore we don't. HP/UX signals will go in
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* arch/parisc/hpux/signal.c when we figure out how to do them.
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*/
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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/kernel.h>
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#include <linux/signal.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/ptrace.h>
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2009-04-27 04:29:53 +00:00
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#include <linux/tracehook.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/unistd.h>
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#include <linux/stddef.h>
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#include <linux/compat.h>
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#include <linux/elf.h>
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#include <asm/ucontext.h>
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#include <asm/rt_sigframe.h>
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#include <asm/uaccess.h>
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#include <asm/pgalloc.h>
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#include <asm/cacheflush.h>
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2005-09-09 18:57:26 +00:00
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#include <asm/asm-offsets.h>
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2005-04-16 22:20:36 +00:00
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#ifdef CONFIG_COMPAT
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#include "signal32.h"
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#endif
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#define DEBUG_SIG 0
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#define DEBUG_SIG_LEVEL 2
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#if DEBUG_SIG
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#define DBG(LEVEL, ...) \
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((DEBUG_SIG_LEVEL >= LEVEL) \
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? printk(__VA_ARGS__) : (void) 0)
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#else
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#define DBG(LEVEL, ...)
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#endif
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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/* gcc will complain if a pointer is cast to an integer of different
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* size. If you really need to do this (and we do for an ELF32 user
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* application in an ELF64 kernel) then you have to do a cast to an
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* integer of the same size first. The A() macro accomplishes
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* this. */
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#define A(__x) ((unsigned long)(__x))
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/*
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* Atomically swap in the new signal mask, and wait for a signal.
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*/
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2007-01-28 13:58:52 +00:00
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#ifdef CONFIG_64BIT
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2005-04-16 22:20:36 +00:00
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#include "sys32.h"
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#endif
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/*
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* Do a signal return - restore sigcontext.
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*/
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/* Trampoline for calling rt_sigreturn() */
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#define INSN_LDI_R25_0 0x34190000 /* ldi 0,%r25 (in_syscall=0) */
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#define INSN_LDI_R25_1 0x34190002 /* ldi 1,%r25 (in_syscall=1) */
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#define INSN_LDI_R20 0x3414015a /* ldi __NR_rt_sigreturn,%r20 */
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#define INSN_BLE_SR2_R0 0xe4008200 /* be,l 0x100(%sr2,%r0),%sr0,%r31 */
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#define INSN_NOP 0x08000240 /* nop */
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/* For debugging */
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#define INSN_DIE_HORRIBLY 0x68000ccc /* stw %r0,0x666(%sr0,%r0) */
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static long
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restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs)
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{
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long err = 0;
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err |= __copy_from_user(regs->gr, sc->sc_gr, sizeof(regs->gr));
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err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr));
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err |= __copy_from_user(regs->iaoq, sc->sc_iaoq, sizeof(regs->iaoq));
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err |= __copy_from_user(regs->iasq, sc->sc_iasq, sizeof(regs->iasq));
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err |= __get_user(regs->sar, &sc->sc_sar);
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DBG(2,"restore_sigcontext: iaoq is 0x%#lx / 0x%#lx\n",
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regs->iaoq[0],regs->iaoq[1]);
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DBG(2,"restore_sigcontext: r28 is %ld\n", regs->gr[28]);
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return err;
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}
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void
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sys_rt_sigreturn(struct pt_regs *regs, int in_syscall)
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{
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struct rt_sigframe __user *frame;
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sigset_t set;
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unsigned long usp = (regs->gr[30] & ~(0x01UL));
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unsigned long sigframe_size = PARISC_RT_SIGFRAME_SIZE;
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2007-01-28 13:58:52 +00:00
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#ifdef CONFIG_64BIT
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2005-04-16 22:20:36 +00:00
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compat_sigset_t compat_set;
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struct compat_rt_sigframe __user * compat_frame;
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2006-06-16 19:10:02 +00:00
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if (is_compat_task())
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2005-04-16 22:20:36 +00:00
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sigframe_size = PARISC_RT_SIGFRAME_SIZE32;
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#endif
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/* Unwind the user stack to get the rt_sigframe structure. */
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frame = (struct rt_sigframe __user *)
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(usp - sigframe_size);
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DBG(2,"sys_rt_sigreturn: frame is %p\n", frame);
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2007-01-28 13:58:52 +00:00
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#ifdef CONFIG_64BIT
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2005-04-16 22:20:36 +00:00
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compat_frame = (struct compat_rt_sigframe __user *)frame;
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2006-06-16 19:10:02 +00:00
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if (is_compat_task()) {
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2005-04-16 22:20:36 +00:00
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DBG(2,"sys_rt_sigreturn: ELF32 process.\n");
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if (__copy_from_user(&compat_set, &compat_frame->uc.uc_sigmask, sizeof(compat_set)))
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goto give_sigsegv;
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sigset_32to64(&set,&compat_set);
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} else
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#endif
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{
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if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
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goto give_sigsegv;
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}
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sigdelsetmask(&set, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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current->blocked = set;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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/* Good thing we saved the old gr[30], eh? */
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2007-01-28 13:58:52 +00:00
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#ifdef CONFIG_64BIT
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2006-06-16 19:10:02 +00:00
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if (is_compat_task()) {
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2005-04-16 22:20:36 +00:00
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DBG(1,"sys_rt_sigreturn: compat_frame->uc.uc_mcontext 0x%p\n",
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&compat_frame->uc.uc_mcontext);
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// FIXME: Load upper half from register file
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if (restore_sigcontext32(&compat_frame->uc.uc_mcontext,
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&compat_frame->regs, regs))
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goto give_sigsegv;
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DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n",
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usp, &compat_frame->uc.uc_stack);
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if (do_sigaltstack32(&compat_frame->uc.uc_stack, NULL, usp) == -EFAULT)
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goto give_sigsegv;
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} else
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#endif
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{
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DBG(1,"sys_rt_sigreturn: frame->uc.uc_mcontext 0x%p\n",
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&frame->uc.uc_mcontext);
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if (restore_sigcontext(&frame->uc.uc_mcontext, regs))
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goto give_sigsegv;
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DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n",
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usp, &frame->uc.uc_stack);
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if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT)
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goto give_sigsegv;
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}
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/* If we are on the syscall path IAOQ will not be restored, and
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* if we are on the interrupt path we must not corrupt gr31.
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*/
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if (in_syscall)
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regs->gr[31] = regs->iaoq[0];
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#if DEBUG_SIG
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DBG(1,"sys_rt_sigreturn: returning to %#lx, DUMPING REGS:\n", regs->iaoq[0]);
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show_regs(regs);
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#endif
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return;
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give_sigsegv:
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DBG(1,"sys_rt_sigreturn: Sending SIGSEGV\n");
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2010-11-30 01:34:38 +00:00
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force_sig(SIGSEGV, current);
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2005-04-16 22:20:36 +00:00
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return;
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}
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/*
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* Set up a signal frame.
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*/
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static inline void __user *
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get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
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{
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/*FIXME: ELF32 vs. ELF64 has different frame_size, but since we
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don't use the parameter it doesn't matter */
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DBG(1,"get_sigframe: ka = %#lx, sp = %#lx, frame_size = %#lx\n",
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(unsigned long)ka, sp, frame_size);
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2006-06-23 09:05:36 +00:00
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if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
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2005-04-16 22:20:36 +00:00
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sp = current->sas_ss_sp; /* Stacks grow up! */
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DBG(1,"get_sigframe: Returning sp = %#lx\n", (unsigned long)sp);
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return (void __user *) sp; /* Stacks grow up. Fun. */
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}
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static long
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setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, int in_syscall)
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{
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unsigned long flags = 0;
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long err = 0;
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if (on_sig_stack((unsigned long) sc))
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flags |= PARISC_SC_FLAG_ONSTACK;
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if (in_syscall) {
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flags |= PARISC_SC_FLAG_IN_SYSCALL;
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/* regs->iaoq is undefined in the syscall return path */
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err |= __put_user(regs->gr[31], &sc->sc_iaoq[0]);
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err |= __put_user(regs->gr[31]+4, &sc->sc_iaoq[1]);
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err |= __put_user(regs->sr[3], &sc->sc_iasq[0]);
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err |= __put_user(regs->sr[3], &sc->sc_iasq[1]);
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DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (in syscall)\n",
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regs->gr[31], regs->gr[31]+4);
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} else {
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err |= __copy_to_user(sc->sc_iaoq, regs->iaoq, sizeof(regs->iaoq));
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err |= __copy_to_user(sc->sc_iasq, regs->iasq, sizeof(regs->iasq));
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DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (not in syscall)\n",
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regs->iaoq[0], regs->iaoq[1]);
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}
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err |= __put_user(flags, &sc->sc_flags);
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err |= __copy_to_user(sc->sc_gr, regs->gr, sizeof(regs->gr));
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err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr));
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err |= __put_user(regs->sar, &sc->sc_sar);
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DBG(1,"setup_sigcontext: r28 is %ld\n", regs->gr[28]);
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return err;
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}
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static long
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setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
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sigset_t *set, struct pt_regs *regs, int in_syscall)
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{
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struct rt_sigframe __user *frame;
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unsigned long rp, usp;
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unsigned long haddr, sigframe_size;
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int err = 0;
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2007-01-28 13:58:52 +00:00
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#ifdef CONFIG_64BIT
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2005-04-16 22:20:36 +00:00
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compat_int_t compat_val;
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struct compat_rt_sigframe __user * compat_frame;
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compat_sigset_t compat_set;
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#endif
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usp = (regs->gr[30] & ~(0x01UL));
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/*FIXME: frame_size parameter is unused, remove it. */
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frame = get_sigframe(ka, usp, sizeof(*frame));
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DBG(1,"SETUP_RT_FRAME: START\n");
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DBG(1,"setup_rt_frame: frame %p info %p\n", frame, info);
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2007-01-28 13:58:52 +00:00
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#ifdef CONFIG_64BIT
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2005-04-16 22:20:36 +00:00
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compat_frame = (struct compat_rt_sigframe __user *)frame;
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2006-06-16 19:10:02 +00:00
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if (is_compat_task()) {
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2005-04-16 22:20:36 +00:00
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DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &compat_frame->info);
|
2006-01-15 19:10:29 +00:00
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err |= copy_siginfo_to_user32(&compat_frame->info, info);
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2005-04-16 22:20:36 +00:00
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DBG(1,"SETUP_RT_FRAME: 1\n");
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compat_val = (compat_int_t)current->sas_ss_sp;
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err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_sp);
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DBG(1,"SETUP_RT_FRAME: 2\n");
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compat_val = (compat_int_t)current->sas_ss_size;
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err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_size);
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DBG(1,"SETUP_RT_FRAME: 3\n");
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compat_val = sas_ss_flags(regs->gr[30]);
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err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_flags);
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DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &compat_frame->uc);
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DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &compat_frame->uc.uc_mcontext);
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err |= setup_sigcontext32(&compat_frame->uc.uc_mcontext,
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&compat_frame->regs, regs, in_syscall);
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sigset_64to32(&compat_set,set);
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err |= __copy_to_user(&compat_frame->uc.uc_sigmask, &compat_set, sizeof(compat_set));
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} else
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#endif
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{
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DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &frame->info);
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err |= copy_siginfo_to_user(&frame->info, info);
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err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
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err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
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err |= __put_user(sas_ss_flags(regs->gr[30]),
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&frame->uc.uc_stack.ss_flags);
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DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &frame->uc);
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DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &frame->uc.uc_mcontext);
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err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, in_syscall);
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/* FIXME: Should probably be converted aswell for the compat case */
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err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
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}
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if (err)
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goto give_sigsegv;
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/* Set up to return from userspace. If provided, use a stub
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|
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already in userspace. The first words of tramp are used to
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save the previous sigrestartblock trampoline that might be
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on the stack. We start the sigreturn trampoline at
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SIGRESTARTBLOCK_TRAMP+X. */
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err |= __put_user(in_syscall ? INSN_LDI_R25_1 : INSN_LDI_R25_0,
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&frame->tramp[SIGRESTARTBLOCK_TRAMP+0]);
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|
|
err |= __put_user(INSN_LDI_R20,
|
|
|
|
&frame->tramp[SIGRESTARTBLOCK_TRAMP+1]);
|
|
|
|
err |= __put_user(INSN_BLE_SR2_R0,
|
|
|
|
&frame->tramp[SIGRESTARTBLOCK_TRAMP+2]);
|
|
|
|
err |= __put_user(INSN_NOP, &frame->tramp[SIGRESTARTBLOCK_TRAMP+3]);
|
|
|
|
|
|
|
|
#if DEBUG_SIG
|
|
|
|
/* Assert that we're flushing in the correct space... */
|
|
|
|
{
|
|
|
|
int sid;
|
|
|
|
asm ("mfsp %%sr3,%0" : "=r" (sid));
|
|
|
|
DBG(1,"setup_rt_frame: Flushing 64 bytes at space %#x offset %p\n",
|
|
|
|
sid, frame->tramp);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
flush_user_dcache_range((unsigned long) &frame->tramp[0],
|
|
|
|
(unsigned long) &frame->tramp[TRAMP_SIZE]);
|
|
|
|
flush_user_icache_range((unsigned long) &frame->tramp[0],
|
|
|
|
(unsigned long) &frame->tramp[TRAMP_SIZE]);
|
|
|
|
|
2008-02-03 13:42:53 +00:00
|
|
|
/* TRAMP Words 0-4, Length 5 = SIGRESTARTBLOCK_TRAMP
|
2005-04-16 22:20:36 +00:00
|
|
|
* TRAMP Words 5-9, Length 4 = SIGRETURN_TRAMP
|
|
|
|
* So the SIGRETURN_TRAMP is at the end of SIGRESTARTBLOCK_TRAMP
|
|
|
|
*/
|
|
|
|
rp = (unsigned long) &frame->tramp[SIGRESTARTBLOCK_TRAMP];
|
|
|
|
|
|
|
|
if (err)
|
|
|
|
goto give_sigsegv;
|
|
|
|
|
|
|
|
haddr = A(ka->sa.sa_handler);
|
|
|
|
/* The sa_handler may be a pointer to a function descriptor */
|
2007-01-28 13:58:52 +00:00
|
|
|
#ifdef CONFIG_64BIT
|
2006-06-16 19:10:02 +00:00
|
|
|
if (is_compat_task()) {
|
2005-04-16 22:20:36 +00:00
|
|
|
#endif
|
|
|
|
if (haddr & PA_PLABEL_FDESC) {
|
|
|
|
Elf32_Fdesc fdesc;
|
|
|
|
Elf32_Fdesc __user *ufdesc = (Elf32_Fdesc __user *)A(haddr & ~3);
|
|
|
|
|
|
|
|
err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc));
|
|
|
|
|
|
|
|
if (err)
|
|
|
|
goto give_sigsegv;
|
|
|
|
|
|
|
|
haddr = fdesc.addr;
|
|
|
|
regs->gr[19] = fdesc.gp;
|
|
|
|
}
|
2007-01-28 13:58:52 +00:00
|
|
|
#ifdef CONFIG_64BIT
|
2005-04-16 22:20:36 +00:00
|
|
|
} else {
|
|
|
|
Elf64_Fdesc fdesc;
|
|
|
|
Elf64_Fdesc __user *ufdesc = (Elf64_Fdesc __user *)A(haddr & ~3);
|
|
|
|
|
|
|
|
err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc));
|
|
|
|
|
|
|
|
if (err)
|
|
|
|
goto give_sigsegv;
|
|
|
|
|
|
|
|
haddr = fdesc.addr;
|
|
|
|
regs->gr[19] = fdesc.gp;
|
|
|
|
DBG(1,"setup_rt_frame: 64 bit signal, exe=%#lx, r19=%#lx, in_syscall=%d\n",
|
|
|
|
haddr, regs->gr[19], in_syscall);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* The syscall return path will create IAOQ values from r31.
|
|
|
|
*/
|
|
|
|
sigframe_size = PARISC_RT_SIGFRAME_SIZE;
|
2007-01-28 13:58:52 +00:00
|
|
|
#ifdef CONFIG_64BIT
|
2006-06-16 19:10:02 +00:00
|
|
|
if (is_compat_task())
|
2005-04-16 22:20:36 +00:00
|
|
|
sigframe_size = PARISC_RT_SIGFRAME_SIZE32;
|
|
|
|
#endif
|
|
|
|
if (in_syscall) {
|
|
|
|
regs->gr[31] = haddr;
|
2007-01-28 13:58:52 +00:00
|
|
|
#ifdef CONFIG_64BIT
|
2006-08-27 15:04:26 +00:00
|
|
|
if (!test_thread_flag(TIF_32BIT))
|
2005-04-16 22:20:36 +00:00
|
|
|
sigframe_size |= 1;
|
|
|
|
#endif
|
|
|
|
} else {
|
|
|
|
unsigned long psw = USER_PSW;
|
2007-01-28 13:58:52 +00:00
|
|
|
#ifdef CONFIG_64BIT
|
2006-08-27 15:04:26 +00:00
|
|
|
if (!test_thread_flag(TIF_32BIT))
|
2005-04-16 22:20:36 +00:00
|
|
|
psw |= PSW_W;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* If we are singlestepping, arrange a trap to be delivered
|
|
|
|
when we return to userspace. Note the semantics -- we
|
|
|
|
should trap before the first insn in the handler is
|
|
|
|
executed. Ref:
|
|
|
|
http://sources.redhat.com/ml/gdb/2004-11/msg00245.html
|
|
|
|
*/
|
|
|
|
if (pa_psw(current)->r) {
|
|
|
|
pa_psw(current)->r = 0;
|
|
|
|
psw |= PSW_R;
|
|
|
|
mtctl(-1, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
regs->gr[0] = psw;
|
|
|
|
regs->iaoq[0] = haddr | 3;
|
|
|
|
regs->iaoq[1] = regs->iaoq[0] + 4;
|
|
|
|
}
|
|
|
|
|
|
|
|
regs->gr[2] = rp; /* userland return pointer */
|
|
|
|
regs->gr[26] = sig; /* signal number */
|
|
|
|
|
2007-01-28 13:58:52 +00:00
|
|
|
#ifdef CONFIG_64BIT
|
2006-06-16 19:10:02 +00:00
|
|
|
if (is_compat_task()) {
|
2005-04-16 22:20:36 +00:00
|
|
|
regs->gr[25] = A(&compat_frame->info); /* siginfo pointer */
|
|
|
|
regs->gr[24] = A(&compat_frame->uc); /* ucontext pointer */
|
|
|
|
} else
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
regs->gr[25] = A(&frame->info); /* siginfo pointer */
|
|
|
|
regs->gr[24] = A(&frame->uc); /* ucontext pointer */
|
|
|
|
}
|
|
|
|
|
|
|
|
DBG(1,"setup_rt_frame: making sigreturn frame: %#lx + %#lx = %#lx\n",
|
|
|
|
regs->gr[30], sigframe_size,
|
|
|
|
regs->gr[30] + sigframe_size);
|
|
|
|
/* Raise the user stack pointer to make a proper call frame. */
|
|
|
|
regs->gr[30] = (A(frame) + sigframe_size);
|
|
|
|
|
|
|
|
|
|
|
|
DBG(1,"setup_rt_frame: sig deliver (%s,%d) frame=0x%p sp=%#lx iaoq=%#lx/%#lx rp=%#lx\n",
|
|
|
|
current->comm, current->pid, frame, regs->gr[30],
|
|
|
|
regs->iaoq[0], regs->iaoq[1], rp);
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
give_sigsegv:
|
|
|
|
DBG(1,"setup_rt_frame: sending SIGSEGV\n");
|
2005-10-22 02:49:47 +00:00
|
|
|
force_sigsegv(sig, current);
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* OK, we're invoking a handler.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static long
|
|
|
|
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
|
|
|
|
sigset_t *oldset, struct pt_regs *regs, int in_syscall)
|
|
|
|
{
|
|
|
|
DBG(1,"handle_signal: sig=%ld, ka=%p, info=%p, oldset=%p, regs=%p\n",
|
|
|
|
sig, ka, info, oldset, regs);
|
|
|
|
|
|
|
|
/* Set up the stack frame */
|
|
|
|
if (!setup_rt_frame(sig, ka, info, oldset, regs, in_syscall))
|
|
|
|
return 0;
|
|
|
|
|
[PATCH] convert signal handling of NODEFER to act like other Unix boxes.
It has been reported that the way Linux handles NODEFER for signals is
not consistent with the way other Unix boxes handle it. I've written a
program to test the behavior of how this flag affects signals and had
several reports from people who ran this on various Unix boxes,
confirming that Linux seems to be unique on the way this is handled.
The way NODEFER affects signals on other Unix boxes is as follows:
1) If NODEFER is set, other signals in sa_mask are still blocked.
2) If NODEFER is set and the signal is in sa_mask, then the signal is
still blocked. (Note: this is the behavior of all tested but Linux _and_
NetBSD 2.0 *).
The way NODEFER affects signals on Linux:
1) If NODEFER is set, other signals are _not_ blocked regardless of
sa_mask (Even NetBSD doesn't do this).
2) If NODEFER is set and the signal is in sa_mask, then the signal being
handled is not blocked.
The patch converts signal handling in all current Linux architectures to
the way most Unix boxes work.
Unix boxes that were tested: DU4, AIX 5.2, Irix 6.5, NetBSD 2.0, SFU
3.5 on WinXP, AIX 5.3, Mac OSX, and of course Linux 2.6.13-rcX.
* NetBSD was the only other Unix to behave like Linux on point #2. The
main concern was brought up by point #1 which even NetBSD isn't like
Linux. So with this patch, we leave NetBSD as the lonely one that
behaves differently here with #2.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-08-29 15:44:09 +00:00
|
|
|
spin_lock_irq(¤t->sighand->siglock);
|
|
|
|
sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
|
|
|
|
if (!(ka->sa.sa_flags & SA_NODEFER))
|
2005-04-16 22:20:36 +00:00
|
|
|
sigaddset(¤t->blocked,sig);
|
[PATCH] convert signal handling of NODEFER to act like other Unix boxes.
It has been reported that the way Linux handles NODEFER for signals is
not consistent with the way other Unix boxes handle it. I've written a
program to test the behavior of how this flag affects signals and had
several reports from people who ran this on various Unix boxes,
confirming that Linux seems to be unique on the way this is handled.
The way NODEFER affects signals on other Unix boxes is as follows:
1) If NODEFER is set, other signals in sa_mask are still blocked.
2) If NODEFER is set and the signal is in sa_mask, then the signal is
still blocked. (Note: this is the behavior of all tested but Linux _and_
NetBSD 2.0 *).
The way NODEFER affects signals on Linux:
1) If NODEFER is set, other signals are _not_ blocked regardless of
sa_mask (Even NetBSD doesn't do this).
2) If NODEFER is set and the signal is in sa_mask, then the signal being
handled is not blocked.
The patch converts signal handling in all current Linux architectures to
the way most Unix boxes work.
Unix boxes that were tested: DU4, AIX 5.2, Irix 6.5, NetBSD 2.0, SFU
3.5 on WinXP, AIX 5.3, Mac OSX, and of course Linux 2.6.13-rcX.
* NetBSD was the only other Unix to behave like Linux on point #2. The
main concern was brought up by point #1 which even NetBSD isn't like
Linux. So with this patch, we leave NetBSD as the lonely one that
behaves differently here with #2.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-08-29 15:44:09 +00:00
|
|
|
recalc_sigpending();
|
|
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
2009-04-27 04:29:53 +00:00
|
|
|
|
2010-02-12 15:53:08 +00:00
|
|
|
tracehook_signal_handler(sig, info, ka, regs,
|
|
|
|
test_thread_flag(TIF_SINGLESTEP) ||
|
|
|
|
test_thread_flag(TIF_BLOCKSTEP));
|
2009-04-27 04:29:53 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2007-01-15 05:36:26 +00:00
|
|
|
static inline void
|
|
|
|
syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
|
|
|
|
{
|
|
|
|
/* Check the return code */
|
|
|
|
switch (regs->gr[28]) {
|
|
|
|
case -ERESTART_RESTARTBLOCK:
|
|
|
|
current_thread_info()->restart_block.fn =
|
|
|
|
do_no_restart_syscall;
|
|
|
|
case -ERESTARTNOHAND:
|
|
|
|
DBG(1,"ERESTARTNOHAND: returning -EINTR\n");
|
|
|
|
regs->gr[28] = -EINTR;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case -ERESTARTSYS:
|
|
|
|
if (!(ka->sa.sa_flags & SA_RESTART)) {
|
|
|
|
DBG(1,"ERESTARTSYS: putting -EINTR\n");
|
|
|
|
regs->gr[28] = -EINTR;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
/* fallthrough */
|
|
|
|
case -ERESTARTNOINTR:
|
|
|
|
/* A syscall is just a branch, so all
|
|
|
|
* we have to do is fiddle the return pointer.
|
|
|
|
*/
|
|
|
|
regs->gr[31] -= 8; /* delayed branching */
|
|
|
|
/* Preserve original r28. */
|
|
|
|
regs->gr[28] = regs->orig_r28;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void
|
|
|
|
insert_restart_trampoline(struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
switch(regs->gr[28]) {
|
|
|
|
case -ERESTART_RESTARTBLOCK: {
|
|
|
|
/* Restart the system call - no handlers present */
|
|
|
|
unsigned int *usp = (unsigned int *)regs->gr[30];
|
|
|
|
|
|
|
|
/* Setup a trampoline to restart the syscall
|
|
|
|
* with __NR_restart_syscall
|
|
|
|
*
|
|
|
|
* 0: <return address (orig r31)>
|
|
|
|
* 4: <2nd half for 64-bit>
|
|
|
|
* 8: ldw 0(%sp), %r31
|
|
|
|
* 12: be 0x100(%sr2, %r0)
|
|
|
|
* 16: ldi __NR_restart_syscall, %r20
|
|
|
|
*/
|
|
|
|
#ifdef CONFIG_64BIT
|
|
|
|
put_user(regs->gr[31] >> 32, &usp[0]);
|
|
|
|
put_user(regs->gr[31] & 0xffffffff, &usp[1]);
|
|
|
|
put_user(0x0fc010df, &usp[2]);
|
|
|
|
#else
|
|
|
|
put_user(regs->gr[31], &usp[0]);
|
|
|
|
put_user(0x0fc0109f, &usp[2]);
|
|
|
|
#endif
|
|
|
|
put_user(0xe0008200, &usp[3]);
|
|
|
|
put_user(0x34140000, &usp[4]);
|
|
|
|
|
|
|
|
/* Stack is 64-byte aligned, and we only need
|
|
|
|
* to flush 1 cache line.
|
|
|
|
* Flushing one cacheline is cheap.
|
|
|
|
* "sync" on bigger (> 4 way) boxes is not.
|
|
|
|
*/
|
2008-04-15 22:36:38 +00:00
|
|
|
flush_user_dcache_range(regs->gr[30], regs->gr[30] + 4);
|
|
|
|
flush_user_icache_range(regs->gr[30], regs->gr[30] + 4);
|
2007-01-15 05:36:26 +00:00
|
|
|
|
|
|
|
regs->gr[31] = regs->gr[30] + 8;
|
|
|
|
/* Preserve original r28. */
|
|
|
|
regs->gr[28] = regs->orig_r28;
|
|
|
|
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
case -ERESTARTNOHAND:
|
|
|
|
case -ERESTARTSYS:
|
|
|
|
case -ERESTARTNOINTR: {
|
|
|
|
/* Hooray for delayed branching. We don't
|
|
|
|
* have to restore %r20 (the system call
|
|
|
|
* number) because it gets loaded in the delay
|
|
|
|
* slot of the branch external instruction.
|
|
|
|
*/
|
|
|
|
regs->gr[31] -= 8;
|
|
|
|
/* Preserve original r28. */
|
|
|
|
regs->gr[28] = regs->orig_r28;
|
|
|
|
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/*
|
|
|
|
* Note that 'init' is a special process: it doesn't get signals it doesn't
|
|
|
|
* want to handle. Thus you cannot kill init even with a SIGKILL even by
|
|
|
|
* mistake.
|
|
|
|
*
|
|
|
|
* We need to be able to restore the syscall arguments (r21-r26) to
|
|
|
|
* restart syscalls. Thus, the syscall path should save them in the
|
|
|
|
* pt_regs structure (it's okay to do so since they are caller-save
|
|
|
|
* registers). As noted below, the syscall number gets restored for
|
|
|
|
* us due to the magic of delayed branching.
|
|
|
|
*/
|
2007-01-08 21:28:06 +00:00
|
|
|
asmlinkage void
|
|
|
|
do_signal(struct pt_regs *regs, long in_syscall)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
siginfo_t info;
|
|
|
|
struct k_sigaction ka;
|
|
|
|
int signr;
|
2007-01-08 21:28:06 +00:00
|
|
|
sigset_t *oldset;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
DBG(1,"\ndo_signal: oldset=0x%p, regs=0x%p, sr7 %#lx, in_syscall=%d\n",
|
|
|
|
oldset, regs, regs->sr[7], in_syscall);
|
|
|
|
|
|
|
|
/* Everyone else checks to see if they are in kernel mode at
|
|
|
|
this point and exits if that's the case. I'm not sure why
|
|
|
|
we would be called in that case, but for some reason we
|
|
|
|
are. */
|
|
|
|
|
2007-01-08 21:28:06 +00:00
|
|
|
if (test_thread_flag(TIF_RESTORE_SIGMASK))
|
|
|
|
oldset = ¤t->saved_sigmask;
|
|
|
|
else
|
2005-04-16 22:20:36 +00:00
|
|
|
oldset = ¤t->blocked;
|
|
|
|
|
|
|
|
DBG(1,"do_signal: oldset %08lx / %08lx\n",
|
|
|
|
oldset->sig[0], oldset->sig[1]);
|
|
|
|
|
|
|
|
|
|
|
|
/* May need to force signal if handle_signal failed to deliver */
|
|
|
|
while (1) {
|
|
|
|
|
|
|
|
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
|
|
|
|
DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]);
|
|
|
|
|
|
|
|
if (signr <= 0)
|
|
|
|
break;
|
|
|
|
|
|
|
|
/* Restart a system call if necessary. */
|
2007-01-15 05:36:26 +00:00
|
|
|
if (in_syscall)
|
|
|
|
syscall_restart(regs, &ka);
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/* Whee! Actually deliver the signal. If the
|
|
|
|
delivery failed, we need to continue to iterate in
|
|
|
|
this loop so we can deliver the SIGSEGV... */
|
2007-01-15 05:36:26 +00:00
|
|
|
if (handle_signal(signr, &info, &ka, oldset,
|
|
|
|
regs, in_syscall)) {
|
2005-04-16 22:20:36 +00:00
|
|
|
DBG(1,KERN_DEBUG "do_signal: Exit (success), regs->gr[28] = %ld\n",
|
|
|
|
regs->gr[28]);
|
2007-01-08 21:28:06 +00:00
|
|
|
if (test_thread_flag(TIF_RESTORE_SIGMASK))
|
|
|
|
clear_thread_flag(TIF_RESTORE_SIGMASK);
|
|
|
|
return;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
/* end of while(1) looping forever if we can't force a signal */
|
|
|
|
|
|
|
|
/* Did we come from a system call? */
|
2007-01-15 05:36:26 +00:00
|
|
|
if (in_syscall)
|
|
|
|
insert_restart_trampoline(regs);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
DBG(1,"do_signal: Exit (not delivered), regs->gr[28] = %ld\n",
|
|
|
|
regs->gr[28]);
|
|
|
|
|
2007-01-08 21:28:06 +00:00
|
|
|
if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
|
|
|
|
clear_thread_flag(TIF_RESTORE_SIGMASK);
|
|
|
|
sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
void do_notify_resume(struct pt_regs *regs, long in_syscall)
|
|
|
|
{
|
|
|
|
if (test_thread_flag(TIF_SIGPENDING) ||
|
|
|
|
test_thread_flag(TIF_RESTORE_SIGMASK))
|
|
|
|
do_signal(regs, in_syscall);
|
2009-09-02 08:14:16 +00:00
|
|
|
|
|
|
|
if (test_thread_flag(TIF_NOTIFY_RESUME)) {
|
|
|
|
clear_thread_flag(TIF_NOTIFY_RESUME);
|
|
|
|
tracehook_notify_resume(regs);
|
KEYS: Add a keyctl to install a process's session keyring on its parent [try #6]
Add a keyctl to install a process's session keyring onto its parent. This
replaces the parent's session keyring. Because the COW credential code does
not permit one process to change another process's credentials directly, the
change is deferred until userspace next starts executing again. Normally this
will be after a wait*() syscall.
To support this, three new security hooks have been provided:
cred_alloc_blank() to allocate unset security creds, cred_transfer() to fill in
the blank security creds and key_session_to_parent() - which asks the LSM if
the process may replace its parent's session keyring.
The replacement may only happen if the process has the same ownership details
as its parent, and the process has LINK permission on the session keyring, and
the session keyring is owned by the process, and the LSM permits it.
Note that this requires alteration to each architecture's notify_resume path.
This has been done for all arches barring blackfin, m68k* and xtensa, all of
which need assembly alteration to support TIF_NOTIFY_RESUME. This allows the
replacement to be performed at the point the parent process resumes userspace
execution.
This allows the userspace AFS pioctl emulation to fully emulate newpag() and
the VIOCSETTOK and VIOCSETTOK2 pioctls, all of which require the ability to
alter the parent process's PAG membership. However, since kAFS doesn't use
PAGs per se, but rather dumps the keys into the session keyring, the session
keyring of the parent must be replaced if, for example, VIOCSETTOK is passed
the newpag flag.
This can be tested with the following program:
#include <stdio.h>
#include <stdlib.h>
#include <keyutils.h>
#define KEYCTL_SESSION_TO_PARENT 18
#define OSERROR(X, S) do { if ((long)(X) == -1) { perror(S); exit(1); } } while(0)
int main(int argc, char **argv)
{
key_serial_t keyring, key;
long ret;
keyring = keyctl_join_session_keyring(argv[1]);
OSERROR(keyring, "keyctl_join_session_keyring");
key = add_key("user", "a", "b", 1, keyring);
OSERROR(key, "add_key");
ret = keyctl(KEYCTL_SESSION_TO_PARENT);
OSERROR(ret, "KEYCTL_SESSION_TO_PARENT");
return 0;
}
Compiled and linked with -lkeyutils, you should see something like:
[dhowells@andromeda ~]$ keyctl show
Session Keyring
-3 --alswrv 4043 4043 keyring: _ses
355907932 --alswrv 4043 -1 \_ keyring: _uid.4043
[dhowells@andromeda ~]$ /tmp/newpag
[dhowells@andromeda ~]$ keyctl show
Session Keyring
-3 --alswrv 4043 4043 keyring: _ses
1055658746 --alswrv 4043 4043 \_ user: a
[dhowells@andromeda ~]$ /tmp/newpag hello
[dhowells@andromeda ~]$ keyctl show
Session Keyring
-3 --alswrv 4043 4043 keyring: hello
340417692 --alswrv 4043 4043 \_ user: a
Where the test program creates a new session keyring, sticks a user key named
'a' into it and then installs it on its parent.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
2009-09-02 08:14:21 +00:00
|
|
|
if (current->replacement_session_keyring)
|
|
|
|
key_replace_session_keyring();
|
2009-09-02 08:14:16 +00:00
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|