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authorAl Viro <viro@zeniv.linux.org.uk>2012-12-14 14:47:53 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2012-12-19 18:07:41 -0500
commit9026843952adac5b123c7b8dc961e5c15828d9e1 (patch)
tree4ef89cf05cf97427ceb2587fed94a6a12833d527 /arch/x86/ia32
parent6bf9adfc90370b695cb111116e15fdc0e1906270 (diff)
downloadop-kernel-dev-9026843952adac5b123c7b8dc961e5c15828d9e1.zip
op-kernel-dev-9026843952adac5b123c7b8dc961e5c15828d9e1.tar.gz
generic compat_sys_sigaltstack()
Again, conditional on CONFIG_GENERIC_SIGALTSTACK Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/x86/ia32')
-rw-r--r--arch/x86/ia32/ia32_signal.c50
-rw-r--r--arch/x86/ia32/ia32entry.S1
2 files changed, 1 insertions, 50 deletions
diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index efc6a95..a866411 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -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;
diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index 32e6f05..102ff7c 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -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
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