* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
* 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
* 2000-12-* x86-64 compatibility mode signal handling by Andi Kleen
- *
- * $Id: ia32_signal.c,v 1.22 2002/07/29 10:34:03 ak Exp $
*/
#include <linux/sched.h>
#include <linux/stddef.h>
#include <linux/personality.h>
#include <linux/compat.h>
+#include <linux/binfmts.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/i387.h>
#include <asm/proto.h>
#include <asm/vsyscall32.h>
-#define ptr_to_u32(x) ((u32)(u64)(x)) /* avoid gcc warning */
-
#define DEBUG_SIG 0
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
-int ia32_copy_siginfo_to_user(siginfo_t32 __user *to, siginfo_t *from)
+int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
{
int err;
- if (!access_ok (VERIFY_WRITE, to, sizeof(siginfo_t32)))
+ if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
return -EFAULT;
/* If you change siginfo_t structure, please make sure that
- this code is fixed accordingly.
- It should never copy any pad contained in the structure
- to avoid security leaks, but must copy the generic
- 3 ints plus the relevant union member. */
- err = __put_user(from->si_signo, &to->si_signo);
- err |= __put_user(from->si_errno, &to->si_errno);
+ this code is fixed accordingly.
+ It should never copy any pad contained in the structure
+ to avoid security leaks, but must copy the generic
+ 3 ints plus the relevant union member. */
+ err = __put_user(from->si_signo, &to->si_signo);
+ err |= __put_user(from->si_errno, &to->si_errno);
err |= __put_user((short)from->si_code, &to->si_code);
if (from->si_code < 0) {
err |= __put_user(from->si_pid, &to->si_pid);
err |= __put_user(from->si_uid, &to->si_uid);
- err |= __put_user((u32)(u64)from->si_ptr, &to->si_ptr);
+ err |= __put_user(ptr_to_compat(from->si_ptr), &to->si_ptr);
} else {
/* First 32bits of unions are always present:
* si_pid === si_band === si_tid === si_addr(LS half) */
err |= __put_user(from->si_utime, &to->si_utime);
err |= __put_user(from->si_stime, &to->si_stime);
err |= __put_user(from->si_status, &to->si_status);
+ /* FALL THROUGH */
default:
case __SI_KILL >> 16:
err |= __put_user(from->si_uid, &to->si_uid);
break;
case __SI_TIMER >> 16:
err |= __put_user(from->si_overrun, &to->si_overrun);
- err |= __put_user((u32)(u64)from->si_ptr, &to->si_ptr);
+ err |= __put_user(ptr_to_compat(from->si_ptr),
+ &to->si_ptr);
break;
case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
case __SI_MESGQ >> 16:
return err;
}
-int ia32_copy_siginfo_from_user(siginfo_t *to, siginfo_t32 __user *from)
+int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
{
int err;
u32 ptr32;
- if (!access_ok (VERIFY_READ, from, sizeof(siginfo_t32)))
+ if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t)))
return -EFAULT;
err = __get_user(to->si_signo, &from->si_signo);
}
asmlinkage long
-sys32_sigsuspend(int history0, int history1, old_sigset_t mask, struct pt_regs regs)
+sys32_sigsuspend(int history0, int history1, old_sigset_t mask)
{
- sigset_t saveset;
-
mask &= _BLOCKABLE;
spin_lock_irq(¤t->sighand->siglock);
- saveset = current->blocked;
+ current->saved_sigmask = current->blocked;
siginitset(¤t->blocked, mask);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
- regs.rax = -EINTR;
- while (1) {
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- if (do_signal(®s, &saveset))
- return -EINTR;
- }
+ current->state = TASK_INTERRUPTIBLE;
+ schedule();
+ set_thread_flag(TIF_RESTORE_SIGMASK);
+ return -ERESTARTNOHAND;
}
asmlinkage long
sys32_sigaltstack(const stack_ia32_t __user *uss_ptr,
stack_ia32_t __user *uoss_ptr,
- struct pt_regs regs)
+ struct pt_regs *regs)
{
stack_t uss,uoss;
int ret;
}
seg = get_fs();
set_fs(KERNEL_DS);
- ret = do_sigaltstack(uss_ptr ? &uss : NULL, &uoss, regs.rsp);
+ ret = do_sigaltstack(uss_ptr ? &uss : NULL, &uoss, regs->rsp);
set_fs(seg);
if (ret >= 0 && uoss_ptr) {
if (!access_ok(VERIFY_WRITE,uoss_ptr,sizeof(stack_ia32_t)) ||
- __put_user((u32)(u64)uoss.ss_sp, &uoss_ptr->ss_sp) ||
+ __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;
int sig;
u32 pinfo;
u32 puc;
- struct siginfo32 info;
+ compat_siginfo_t info;
struct ucontext_ia32 uc;
struct _fpstate_ia32 fpstate;
char retcode[8];
sc, sc->err, sc->eip, sc->cs, sc->eflags);
#endif
#define COPY(x) { \
- unsigned int reg; \
+ unsigned int reg; \
err |= __get_user(reg, &sc->e ##x); \
regs->r ## x = reg; \
}
#define RELOAD_SEG(seg,mask) \
- { unsigned int cur; \
- unsigned short pre; \
+ { unsigned int cur; \
+ unsigned short pre; \
err |= __get_user(pre, &sc->seg); \
asm volatile("movl %%" #seg ",%0" : "=r" (cur)); \
pre |= mask; \
err |= __get_user(tmp, &sc->fpstate);
buf = compat_ptr(tmp);
if (buf) {
- if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
+ if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
goto badframe;
err |= restore_i387_ia32(current, buf, 0);
+ } else {
+ struct task_struct *me = current;
+ if (used_math()) {
+ clear_fpu(me);
+ clear_used_math();
+ }
}
}
return 1;
}
-asmlinkage long sys32_sigreturn(struct pt_regs regs)
+asmlinkage long sys32_sigreturn(struct pt_regs *regs)
{
- struct sigframe __user *frame = (struct sigframe __user *)(regs.rsp-8);
+ struct sigframe __user *frame = (struct sigframe __user *)(regs->rsp-8);
sigset_t set;
unsigned int eax;
- if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
+ if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
goto badframe;
if (__get_user(set.sig[0], &frame->sc.oldmask)
|| (_COMPAT_NSIG_WORDS > 1
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
- if (ia32_restore_sigcontext(®s, &frame->sc, &eax))
+ if (ia32_restore_sigcontext(regs, &frame->sc, &eax))
goto badframe;
return eax;
badframe:
- signal_fault(®s, frame, "32bit sigreturn");
+ signal_fault(regs, frame, "32bit sigreturn");
return 0;
}
-asmlinkage long sys32_rt_sigreturn(struct pt_regs regs)
+asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
{
- struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(regs.rsp - 4);
+ struct rt_sigframe __user *frame;
sigset_t set;
unsigned int eax;
+ struct pt_regs tregs;
+
+ frame = (struct rt_sigframe __user *)(regs->rsp - 4);
- if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
+ if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
goto badframe;
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
goto badframe;
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
- if (ia32_restore_sigcontext(®s, &frame->uc.uc_mcontext, &eax))
+ if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext, &eax))
goto badframe;
- if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, regs) == -EFAULT)
+ tregs = *regs;
+ if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT)
goto badframe;
return eax;
badframe:
- signal_fault(®s,frame,"32bit rt sigreturn");
+ signal_fault(regs,frame,"32bit rt sigreturn");
return 0;
}
tmp = save_i387_ia32(current, fpstate, regs, 0);
if (tmp < 0)
- err = -EFAULT;
+ err = -EFAULT;
else {
- current->used_math = 0;
+ clear_used_math();
stts();
- err |= __put_user((u32)(u64)(tmp ? fpstate : NULL), &sc->fpstate);
+ err |= __put_user(ptr_to_compat(tmp ? fpstate : NULL),
+ &sc->fpstate);
}
/* non-iBCS2 extensions.. */
rsp = (unsigned long) ka->sa.sa_restorer;
}
- return (void __user *)((rsp - frame_size) & -8UL);
+ rsp -= frame_size;
+ /* Align the stack pointer according to the i386 ABI,
+ * i.e. so that on function entry ((sp + 4) & 15) == 0. */
+ rsp = ((rsp + 4) & -16ul) - 4;
+ return (void __user *) rsp;
}
-void ia32_setup_frame(int sig, struct k_sigaction *ka,
- compat_sigset_t *set, struct pt_regs * regs)
+int ia32_setup_frame(int sig, struct k_sigaction *ka,
+ compat_sigset_t *set, struct pt_regs * regs)
{
struct sigframe __user *frame;
int err = 0;
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
goto give_sigsegv;
- {
- struct exec_domain *ed = current_thread_info()->exec_domain;
- err |= __put_user((ed
- && ed->signal_invmap
- && sig < 32
- ? ed->signal_invmap[sig]
- : sig),
- &frame->sig);
- }
+ err |= __put_user(sig, &frame->sig);
if (err)
goto give_sigsegv;
- err |= ia32_setup_sigcontext(&frame->sc, &frame->fpstate, regs, set->sig[0]);
+ err |= ia32_setup_sigcontext(&frame->sc, &frame->fpstate, regs,
+ set->sig[0]);
if (err)
goto give_sigsegv;
/* Return stub is in 32bit vsyscall page */
{
- void __user *restorer = VSYSCALL32_SIGRETURN;
+ void __user *restorer;
+ if (current->binfmt->hasvdso)
+ restorer = VSYSCALL32_SIGRETURN;
+ else
+ restorer = (void *)&frame->retcode;
if (ka->sa.sa_flags & SA_RESTORER)
restorer = ka->sa.sa_restorer;
- err |= __put_user(ptr_to_u32(restorer), &frame->pretcode);
+ err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
}
/* These are actually not used anymore, but left because some
gdb versions depend on them as a marker. */
regs->rsp = (unsigned long) frame;
regs->rip = (unsigned long) ka->sa.sa_handler;
+ /* Make -mregparm=3 work */
+ regs->rax = sig;
+ regs->rdx = 0;
+ regs->rcx = 0;
+
asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
regs->cs = __USER32_CS;
regs->ss = __USER32_DS;
-
set_fs(USER_DS);
- regs->eflags &= ~TF_MASK;
#if DEBUG_SIG
printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
current->comm, current->pid, frame, regs->rip, frame->pretcode);
#endif
- return;
+ return 0;
give_sigsegv:
- if (sig == SIGSEGV)
- ka->sa.sa_handler = SIG_DFL;
- signal_fault(regs,frame,"32bit signal deliver");
+ force_sigsegv(sig, current);
+ return -EFAULT;
}
-void ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
- compat_sigset_t *set, struct pt_regs * regs)
+int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+ compat_sigset_t *set, struct pt_regs * regs)
{
struct rt_sigframe __user *frame;
int err = 0;
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
goto give_sigsegv;
-
{
struct exec_domain *ed = current_thread_info()->exec_domain;
- err |= __put_user((ed
+ err |= __put_user((ed
&& ed->signal_invmap
&& sig < 32
? ed->signal_invmap[sig]
: sig),
&frame->sig);
}
- err |= __put_user((u32)(u64)&frame->info, &frame->pinfo);
- err |= __put_user((u32)(u64)&frame->uc, &frame->puc);
- err |= ia32_copy_siginfo_to_user(&frame->info, info);
+ err |= __put_user(ptr_to_compat(&frame->info), &frame->pinfo);
+ err |= __put_user(ptr_to_compat(&frame->uc), &frame->puc);
+ err |= copy_siginfo_to_user32(&frame->info, info);
if (err)
goto give_sigsegv;
void __user *restorer = VSYSCALL32_RTSIGRETURN;
if (ka->sa.sa_flags & SA_RESTORER)
restorer = ka->sa.sa_restorer;
- err |= __put_user(ptr_to_u32(restorer), &frame->pretcode);
+ err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
}
/* This is movl $,%eax ; int $0x80 */
regs->rsp = (unsigned long) frame;
regs->rip = (unsigned long) ka->sa.sa_handler;
+ /* Make -mregparm=3 work */
+ regs->rax = sig;
+ regs->rdx = (unsigned long) &frame->info;
+ regs->rcx = (unsigned long) &frame->uc;
+
+ /* Make -mregparm=3 work */
+ regs->rax = sig;
+ regs->rdx = (unsigned long) &frame->info;
+ regs->rcx = (unsigned long) &frame->uc;
+
asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
regs->ss = __USER32_DS;
set_fs(USER_DS);
- regs->eflags &= ~TF_MASK;
#if DEBUG_SIG
printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
current->comm, current->pid, frame, regs->rip, frame->pretcode);
#endif
- return;
+ return 0;
give_sigsegv:
- if (sig == SIGSEGV)
- ka->sa.sa_handler = SIG_DFL;
- signal_fault(regs, frame, "32bit rt signal setup");
+ force_sigsegv(sig, current);
+ return -EFAULT;
}
-
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