PWN-Hunter/android_kernel_xiaomi_sdm845
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

x86: signal_64.c: get_stack() doesn't need entire regs

Browse Source 
Impact: cleanup

get_stack() uses sp only, entire regs is not needed.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Hiroshi Shimamoto 2008-10-23 17:15:28 -07:00 committed by Ingo Molnar
parent 709110bd56
commit fd4a2030a3
1 changed files with 4 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/x86/kernel/signal_64.c
View File

@ -199,12 +199,10 @@ setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
*/
static void __user *
get_stack(struct k_sigaction *ka, struct pt_regs *regs, unsigned long size)
get_stack(struct k_sigaction *ka, unsigned long sp, unsigned long size)
{
unsigned long sp;
/* Default to using normal stack - redzone*/
sp = regs->sp - 128;
sp -= 128;
/* This is the X/Open sanctioned signal stack switching. */
if (ka->sa.sa_flags & SA_ONSTACK) {
@ -224,14 +222,14 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
struct task_struct *me = current;
if (used_math()) {
fp = get_stack(ka, regs, sig_xstate_size);
fp = get_stack(ka, regs->sp, sig_xstate_size);
frame = (void __user *)round_down(
(unsigned long)fp - sizeof(struct rt_sigframe), 16) - 8;
if (save_i387_xstate(fp) < 0)
return -EFAULT;
} else
frame = get_stack(ka, regs, sizeof(struct rt_sigframe)) - 8;
frame = get_stack(ka, regs->sp, sizeof(struct rt_sigframe)) - 8;
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
return -EFAULT;