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Subject[RFC][PATCH v2 20/22] x86: x32_setup_rt_frame(): consolidate uaccess areas
Date
From: Al Viro <viro@zeniv.linux.org.uk>

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
arch/x86/kernel/signal.c | 17 +++++------------
1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index e37d5a1bb713..38b359325291 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -517,7 +517,6 @@ static int x32_setup_rt_frame(struct ksignal *ksig,
struct rt_sigframe_x32 __user *frame;
unsigned long uc_flags;
void __user *restorer;
- int err = 0;
void __user *fp = NULL;

if (!(ksig->ka.sa.sa_flags & SA_RESTORER))
@@ -525,14 +524,6 @@ static int x32_setup_rt_frame(struct ksignal *ksig,

frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fp);

- if (!access_ok(frame, sizeof(*frame)))
- return -EFAULT;
-
- if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
- if (__copy_siginfo_to_user32(&frame->info, &ksig->info, true))
- return -EFAULT;
- }
-
uc_flags = frame_uc_flags(regs);

if (!user_access_begin(frame, sizeof(*frame)))
@@ -546,11 +537,13 @@ static int x32_setup_rt_frame(struct ksignal *ksig,
restorer = ksig->ka.sa.sa_restorer;
unsafe_put_user(restorer, (unsigned long __user *)&frame->pretcode, Efault);
unsafe_put_sigcontext(&frame->uc.uc_mcontext, fp, regs, set, Efault);
+ unsafe_put_user(*(__u64 *)set, (__u64 __user *)&frame->uc.uc_sigmask, Efault);
user_access_end();
- err |= __put_user(*(__u64 *)set, (__u64 __user *)&frame->uc.uc_sigmask);

- if (err)
- return -EFAULT;
+ if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
+ if (__copy_siginfo_to_user32(&frame->info, &ksig->info, true))
+ return -EFAULT;
+ }

/* Set up registers for signal handler */
regs->sp = (unsigned long) frame;
--
2.11.0
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