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Diffstat (limited to 'arch/x86/kernel/signal_32.c')
-rw-r--r--arch/x86/kernel/signal_32.c225
1 files changed, 117 insertions, 108 deletions
diff --git a/arch/x86/kernel/signal_32.c b/arch/x86/kernel/signal_32.c
index 20f29e4c1d3..caee1f002fe 100644
--- a/arch/x86/kernel/signal_32.c
+++ b/arch/x86/kernel/signal_32.c
@@ -23,6 +23,7 @@
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/i387.h>
+#include <asm/vdso.h>
#include "sigframe_32.h"
#define DEBUG_SIG 0
@@ -81,14 +82,14 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
}
asmlinkage int
-sys_sigaltstack(unsigned long ebx)
+sys_sigaltstack(unsigned long bx)
{
/* This is needed to make gcc realize it doesn't own the "struct pt_regs" */
- struct pt_regs *regs = (struct pt_regs *)&ebx;
- const stack_t __user *uss = (const stack_t __user *)ebx;
- stack_t __user *uoss = (stack_t __user *)regs->ecx;
+ struct pt_regs *regs = (struct pt_regs *)&bx;
+ const stack_t __user *uss = (const stack_t __user *)bx;
+ stack_t __user *uoss = (stack_t __user *)regs->cx;
- return do_sigaltstack(uss, uoss, regs->esp);
+ return do_sigaltstack(uss, uoss, regs->sp);
}
@@ -109,12 +110,12 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *peax
#define COPY_SEG(seg) \
{ unsigned short tmp; \
err |= __get_user(tmp, &sc->seg); \
- regs->x##seg = tmp; }
+ regs->seg = tmp; }
#define COPY_SEG_STRICT(seg) \
{ unsigned short tmp; \
err |= __get_user(tmp, &sc->seg); \
- regs->x##seg = tmp|3; }
+ regs->seg = tmp|3; }
#define GET_SEG(seg) \
{ unsigned short tmp; \
@@ -130,22 +131,22 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *peax
COPY_SEG(fs);
COPY_SEG(es);
COPY_SEG(ds);
- COPY(edi);
- COPY(esi);
- COPY(ebp);
- COPY(esp);
- COPY(ebx);
- COPY(edx);
- COPY(ecx);
- COPY(eip);
+ COPY(di);
+ COPY(si);
+ COPY(bp);
+ COPY(sp);
+ COPY(bx);
+ COPY(dx);
+ COPY(cx);
+ COPY(ip);
COPY_SEG_STRICT(cs);
COPY_SEG_STRICT(ss);
{
unsigned int tmpflags;
- err |= __get_user(tmpflags, &sc->eflags);
- regs->eflags = (regs->eflags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
- regs->orig_eax = -1; /* disable syscall checks */
+ err |= __get_user(tmpflags, &sc->flags);
+ regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
+ regs->orig_ax = -1; /* disable syscall checks */
}
{
@@ -164,7 +165,7 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *peax
}
}
- err |= __get_user(*peax, &sc->eax);
+ err |= __get_user(*peax, &sc->ax);
return err;
badframe:
@@ -174,9 +175,9 @@ badframe:
asmlinkage int sys_sigreturn(unsigned long __unused)
{
struct pt_regs *regs = (struct pt_regs *) &__unused;
- struct sigframe __user *frame = (struct sigframe __user *)(regs->esp - 8);
+ struct sigframe __user *frame = (struct sigframe __user *)(regs->sp - 8);
sigset_t set;
- int eax;
+ int ax;
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
goto badframe;
@@ -192,17 +193,20 @@ asmlinkage int sys_sigreturn(unsigned long __unused)
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
- if (restore_sigcontext(regs, &frame->sc, &eax))
+ if (restore_sigcontext(regs, &frame->sc, &ax))
goto badframe;
- return eax;
+ return ax;
badframe:
- if (show_unhandled_signals && printk_ratelimit())
- printk("%s%s[%d] bad frame in sigreturn frame:%p eip:%lx"
- " esp:%lx oeax:%lx\n",
+ if (show_unhandled_signals && printk_ratelimit()) {
+ printk("%s%s[%d] bad frame in sigreturn frame:%p ip:%lx"
+ " sp:%lx oeax:%lx",
task_pid_nr(current) > 1 ? KERN_INFO : KERN_EMERG,
- current->comm, task_pid_nr(current), frame, regs->eip,
- regs->esp, regs->orig_eax);
+ current->comm, task_pid_nr(current), frame, regs->ip,
+ regs->sp, regs->orig_ax);
+ print_vma_addr(" in ", regs->ip);
+ printk("\n");
+ }
force_sig(SIGSEGV, current);
return 0;
@@ -211,9 +215,9 @@ badframe:
asmlinkage int sys_rt_sigreturn(unsigned long __unused)
{
struct pt_regs *regs = (struct pt_regs *) &__unused;
- struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(regs->esp - 4);
+ struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(regs->sp - 4);
sigset_t set;
- int eax;
+ int ax;
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
goto badframe;
@@ -226,13 +230,13 @@ asmlinkage int sys_rt_sigreturn(unsigned long __unused)
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
- if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &eax))
+ if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
goto badframe;
- if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->esp) == -EFAULT)
+ if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT)
goto badframe;
- return eax;
+ return ax;
badframe:
force_sig(SIGSEGV, current);
@@ -249,27 +253,27 @@ setup_sigcontext(struct sigcontext __user *sc, struct _fpstate __user *fpstate,
{
int tmp, err = 0;
- err |= __put_user(regs->xfs, (unsigned int __user *)&sc->fs);
+ err |= __put_user(regs->fs, (unsigned int __user *)&sc->fs);
savesegment(gs, tmp);
err |= __put_user(tmp, (unsigned int __user *)&sc->gs);
- err |= __put_user(regs->xes, (unsigned int __user *)&sc->es);
- err |= __put_user(regs->xds, (unsigned int __user *)&sc->ds);
- err |= __put_user(regs->edi, &sc->edi);
- err |= __put_user(regs->esi, &sc->esi);
- err |= __put_user(regs->ebp, &sc->ebp);
- err |= __put_user(regs->esp, &sc->esp);
- err |= __put_user(regs->ebx, &sc->ebx);
- err |= __put_user(regs->edx, &sc->edx);
- err |= __put_user(regs->ecx, &sc->ecx);
- err |= __put_user(regs->eax, &sc->eax);
+ err |= __put_user(regs->es, (unsigned int __user *)&sc->es);
+ err |= __put_user(regs->ds, (unsigned int __user *)&sc->ds);
+ err |= __put_user(regs->di, &sc->di);
+ err |= __put_user(regs->si, &sc->si);
+ err |= __put_user(regs->bp, &sc->bp);
+ err |= __put_user(regs->sp, &sc->sp);
+ err |= __put_user(regs->bx, &sc->bx);
+ err |= __put_user(regs->dx, &sc->dx);
+ err |= __put_user(regs->cx, &sc->cx);
+ err |= __put_user(regs->ax, &sc->ax);
err |= __put_user(current->thread.trap_no, &sc->trapno);
err |= __put_user(current->thread.error_code, &sc->err);
- err |= __put_user(regs->eip, &sc->eip);
- err |= __put_user(regs->xcs, (unsigned int __user *)&sc->cs);
- err |= __put_user(regs->eflags, &sc->eflags);
- err |= __put_user(regs->esp, &sc->esp_at_signal);
- err |= __put_user(regs->xss, (unsigned int __user *)&sc->ss);
+ err |= __put_user(regs->ip, &sc->ip);
+ err |= __put_user(regs->cs, (unsigned int __user *)&sc->cs);
+ err |= __put_user(regs->flags, &sc->flags);
+ err |= __put_user(regs->sp, &sc->sp_at_signal);
+ err |= __put_user(regs->ss, (unsigned int __user *)&sc->ss);
tmp = save_i387(fpstate);
if (tmp < 0)
@@ -290,29 +294,36 @@ setup_sigcontext(struct sigcontext __user *sc, struct _fpstate __user *fpstate,
static inline void __user *
get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
{
- unsigned long esp;
+ unsigned long sp;
/* Default to using normal stack */
- esp = regs->esp;
+ sp = regs->sp;
+
+ /*
+ * If we are on the alternate signal stack and would overflow it, don't.
+ * Return an always-bogus address instead so we will die with SIGSEGV.
+ */
+ if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size)))
+ return (void __user *) -1L;
/* This is the X/Open sanctioned signal stack switching. */
if (ka->sa.sa_flags & SA_ONSTACK) {
- if (sas_ss_flags(esp) == 0)
- esp = current->sas_ss_sp + current->sas_ss_size;
+ if (sas_ss_flags(sp) == 0)
+ sp = current->sas_ss_sp + current->sas_ss_size;
}
/* This is the legacy signal stack switching. */
- else if ((regs->xss & 0xffff) != __USER_DS &&
+ else if ((regs->ss & 0xffff) != __USER_DS &&
!(ka->sa.sa_flags & SA_RESTORER) &&
ka->sa.sa_restorer) {
- esp = (unsigned long) ka->sa.sa_restorer;
+ sp = (unsigned long) ka->sa.sa_restorer;
}
- esp -= frame_size;
+ sp -= frame_size;
/* Align the stack pointer according to the i386 ABI,
* i.e. so that on function entry ((sp + 4) & 15) == 0. */
- esp = ((esp + 4) & -16ul) - 4;
- return (void __user *) esp;
+ sp = ((sp + 4) & -16ul) - 4;
+ return (void __user *) sp;
}
/* These symbols are defined with the addresses in the vsyscall page.
@@ -355,9 +366,9 @@ static int setup_frame(int sig, struct k_sigaction *ka,
}
if (current->binfmt->hasvdso)
- restorer = (void *)VDSO_SYM(&__kernel_sigreturn);
+ restorer = VDSO32_SYMBOL(current->mm->context.vdso, sigreturn);
else
- restorer = (void *)&frame->retcode;
+ restorer = &frame->retcode;
if (ka->sa.sa_flags & SA_RESTORER)
restorer = ka->sa.sa_restorer;
@@ -379,16 +390,16 @@ static int setup_frame(int sig, struct k_sigaction *ka,
goto give_sigsegv;
/* Set up registers for signal handler */
- regs->esp = (unsigned long) frame;
- regs->eip = (unsigned long) ka->sa.sa_handler;
- regs->eax = (unsigned long) sig;
- regs->edx = (unsigned long) 0;
- regs->ecx = (unsigned long) 0;
+ regs->sp = (unsigned long) frame;
+ regs->ip = (unsigned long) ka->sa.sa_handler;
+ regs->ax = (unsigned long) sig;
+ regs->dx = (unsigned long) 0;
+ regs->cx = (unsigned long) 0;
- regs->xds = __USER_DS;
- regs->xes = __USER_DS;
- regs->xss = __USER_DS;
- regs->xcs = __USER_CS;
+ regs->ds = __USER_DS;
+ regs->es = __USER_DS;
+ regs->ss = __USER_DS;
+ regs->cs = __USER_CS;
/*
* Clear TF when entering the signal handler, but
@@ -396,13 +407,13 @@ static int setup_frame(int sig, struct k_sigaction *ka,
* The tracer may want to single-step inside the
* handler too.
*/
- regs->eflags &= ~TF_MASK;
+ regs->flags &= ~TF_MASK;
if (test_thread_flag(TIF_SINGLESTEP))
ptrace_notify(SIGTRAP);
#if DEBUG_SIG
printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
- current->comm, current->pid, frame, regs->eip, frame->pretcode);
+ current->comm, current->pid, frame, regs->ip, frame->pretcode);
#endif
return 0;
@@ -442,7 +453,7 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
err |= __put_user(0, &frame->uc.uc_flags);
err |= __put_user(0, &frame->uc.uc_link);
err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
- err |= __put_user(sas_ss_flags(regs->esp),
+ err |= __put_user(sas_ss_flags(regs->sp),
&frame->uc.uc_stack.ss_flags);
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
@@ -452,13 +463,13 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
goto give_sigsegv;
/* Set up to return from userspace. */
- restorer = (void *)VDSO_SYM(&__kernel_rt_sigreturn);
+ restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn);
if (ka->sa.sa_flags & SA_RESTORER)
restorer = ka->sa.sa_restorer;
err |= __put_user(restorer, &frame->pretcode);
/*
- * This is movl $,%eax ; int $0x80
+ * This is movl $,%ax ; int $0x80
*
* WE DO NOT USE IT ANY MORE! It's only left here for historical
* reasons and because gdb uses it as a signature to notice
@@ -472,16 +483,16 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
goto give_sigsegv;
/* Set up registers for signal handler */
- regs->esp = (unsigned long) frame;
- regs->eip = (unsigned long) ka->sa.sa_handler;
- regs->eax = (unsigned long) usig;
- regs->edx = (unsigned long) &frame->info;
- regs->ecx = (unsigned long) &frame->uc;
+ regs->sp = (unsigned long) frame;
+ regs->ip = (unsigned long) ka->sa.sa_handler;
+ regs->ax = (unsigned long) usig;
+ regs->dx = (unsigned long) &frame->info;
+ regs->cx = (unsigned long) &frame->uc;
- regs->xds = __USER_DS;
- regs->xes = __USER_DS;
- regs->xss = __USER_DS;
- regs->xcs = __USER_CS;
+ regs->ds = __USER_DS;
+ regs->es = __USER_DS;
+ regs->ss = __USER_DS;
+ regs->cs = __USER_CS;
/*
* Clear TF when entering the signal handler, but
@@ -489,13 +500,13 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
* The tracer may want to single-step inside the
* handler too.
*/
- regs->eflags &= ~TF_MASK;
+ regs->flags &= ~TF_MASK;
if (test_thread_flag(TIF_SINGLESTEP))
ptrace_notify(SIGTRAP);
#if DEBUG_SIG
printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
- current->comm, current->pid, frame, regs->eip, frame->pretcode);
+ current->comm, current->pid, frame, regs->ip, frame->pretcode);
#endif
return 0;
@@ -516,35 +527,33 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
int ret;
/* Are we from a system call? */
- if (regs->orig_eax >= 0) {
+ if (regs->orig_ax >= 0) {
/* If so, check system call restarting.. */
- switch (regs->eax) {
+ switch (regs->ax) {
case -ERESTART_RESTARTBLOCK:
case -ERESTARTNOHAND:
- regs->eax = -EINTR;
+ regs->ax = -EINTR;
break;
case -ERESTARTSYS:
if (!(ka->sa.sa_flags & SA_RESTART)) {
- regs->eax = -EINTR;
+ regs->ax = -EINTR;
break;
}
/* fallthrough */
case -ERESTARTNOINTR:
- regs->eax = regs->orig_eax;
- regs->eip -= 2;
+ regs->ax = regs->orig_ax;
+ regs->ip -= 2;
}
}
/*
- * If TF is set due to a debugger (PT_DTRACE), clear the TF flag so
- * that register information in the sigcontext is correct.
+ * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF
+ * flag so that register information in the sigcontext is correct.
*/
- if (unlikely(regs->eflags & TF_MASK)
- && likely(current->ptrace & PT_DTRACE)) {
- current->ptrace &= ~PT_DTRACE;
- regs->eflags &= ~TF_MASK;
- }
+ if (unlikely(regs->flags & X86_EFLAGS_TF) &&
+ likely(test_and_clear_thread_flag(TIF_FORCED_TF)))
+ regs->flags &= ~X86_EFLAGS_TF;
/* Set up the stack frame */
if (ka->sa.sa_flags & SA_SIGINFO)
@@ -569,7 +578,7 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*/
-static void fastcall do_signal(struct pt_regs *regs)
+static void do_signal(struct pt_regs *regs)
{
siginfo_t info;
int signr;
@@ -599,8 +608,8 @@ static void fastcall do_signal(struct pt_regs *regs)
* have been cleared if the watchpoint triggered
* inside the kernel.
*/
- if (unlikely(current->thread.debugreg[7]))
- set_debugreg(current->thread.debugreg[7], 7);
+ if (unlikely(current->thread.debugreg7))
+ set_debugreg(current->thread.debugreg7, 7);
/* Whee! Actually deliver the signal. */
if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
@@ -616,19 +625,19 @@ static void fastcall do_signal(struct pt_regs *regs)
}
/* Did we come from a system call? */
- if (regs->orig_eax >= 0) {
+ if (regs->orig_ax >= 0) {
/* Restart the system call - no handlers present */
- switch (regs->eax) {
+ switch (regs->ax) {
case -ERESTARTNOHAND:
case -ERESTARTSYS:
case -ERESTARTNOINTR:
- regs->eax = regs->orig_eax;
- regs->eip -= 2;
+ regs->ax = regs->orig_ax;
+ regs->ip -= 2;
break;
case -ERESTART_RESTARTBLOCK:
- regs->eax = __NR_restart_syscall;
- regs->eip -= 2;
+ regs->ax = __NR_restart_syscall;
+ regs->ip -= 2;
break;
}
}
@@ -651,7 +660,7 @@ void do_notify_resume(struct pt_regs *regs, void *_unused,
{
/* Pending single-step? */
if (thread_info_flags & _TIF_SINGLESTEP) {
- regs->eflags |= TF_MASK;
+ regs->flags |= TF_MASK;
clear_thread_flag(TIF_SINGLESTEP);
}