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authorAl Viro <viro@zeniv.linux.org.uk>2012-12-23 01:56:45 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2013-02-14 09:17:29 -0500
commit207bdae452e6d3eeba19cc3912e5dfb088adc376 (patch)
treeb2a11a7ba5ee7152d0a9e9f9d42a5dc02c48ed57 /arch/arm64/kernel/signal32.c
parent0aa0203fb43f04714004b2c4ad33b858e240555d (diff)
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arm64: switch to generic sigaltstack
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/arm64/kernel/signal32.c')
-rw-r--r--arch/arm64/kernel/signal32.c53
1 files changed, 2 insertions, 51 deletions
diff --git a/arch/arm64/kernel/signal32.c b/arch/arm64/kernel/signal32.c
index a4db3d22aac4..54920c5342b2 100644
--- a/arch/arm64/kernel/signal32.c
+++ b/arch/arm64/kernel/signal32.c
@@ -42,12 +42,6 @@ struct compat_old_sigaction {
compat_uptr_t sa_restorer;
};
-typedef struct compat_sigaltstack {
- compat_uptr_t ss_sp;
- int ss_flags;
- compat_size_t ss_size;
-} compat_stack_t;
-
struct compat_sigcontext {
/* We always set these two fields to 0 */
compat_ulong_t trap_no;
@@ -423,43 +417,6 @@ asmlinkage int compat_sys_rt_sigaction(int sig,
return ret;
}
-int compat_do_sigaltstack(compat_uptr_t compat_uss, compat_uptr_t compat_uoss,
- compat_ulong_t sp)
-{
- compat_stack_t __user *newstack = compat_ptr(compat_uss);
- compat_stack_t __user *oldstack = compat_ptr(compat_uoss);
- compat_uptr_t ss_sp;
- int ret;
- mm_segment_t old_fs;
- stack_t uss, uoss;
-
- /* Marshall the compat new stack into a stack_t */
- if (newstack) {
- if (get_user(ss_sp, &newstack->ss_sp) ||
- __get_user(uss.ss_flags, &newstack->ss_flags) ||
- __get_user(uss.ss_size, &newstack->ss_size))
- return -EFAULT;
- uss.ss_sp = compat_ptr(ss_sp);
- }
-
- old_fs = get_fs();
- set_fs(KERNEL_DS);
- /* The __user pointer casts are valid because of the set_fs() */
- ret = do_sigaltstack(
- newstack ? (stack_t __user *) &uss : NULL,
- oldstack ? (stack_t __user *) &uoss : NULL,
- (unsigned long)sp);
- set_fs(old_fs);
-
- /* Convert the old stack_t into a compat stack. */
- if (!ret && oldstack &&
- (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) ||
- __put_user(uoss.ss_flags, &oldstack->ss_flags) ||
- __put_user(uoss.ss_size, &oldstack->ss_size)))
- return -EFAULT;
- return ret;
-}
-
static int compat_restore_sigframe(struct pt_regs *regs,
struct compat_sigframe __user *sf)
{
@@ -562,9 +519,7 @@ asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs)
if (compat_restore_sigframe(regs, &frame->sig))
goto badframe;
- if (compat_do_sigaltstack(ptr_to_compat(&frame->sig.uc.uc_stack),
- ptr_to_compat((void __user *)NULL),
- regs->compat_sp) == -EFAULT)
+ if (compat_restore_altstack(&frame->sig.uc.uc_stack))
goto badframe;
return regs->regs[0];
@@ -705,11 +660,7 @@ int compat_setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
__put_user_error(0, &frame->sig.uc.uc_flags, err);
__put_user_error(NULL, &frame->sig.uc.uc_link, err);
- memset(&stack, 0, sizeof(stack));
- stack.ss_sp = (compat_uptr_t)current->sas_ss_sp;
- stack.ss_flags = sas_ss_flags(regs->compat_sp);
- stack.ss_size = current->sas_ss_size;
- err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack));
+ err |= __compat_save_altstack(&frame->sig.uc.uc_stack, regs->compat_sp);
err |= compat_setup_sigframe(&frame->sig, regs, set);