lkml.org 
[lkml]   [2020]   [Aug]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC PATCH v1 11/19] powerpc/signal32: Simplify logging in handle_rt_signal32()
Date
If something is bad in the frame, there is no point in
knowing which part of the frame exactly is wrong as it
got allocated as a single block.

Always print the root address of the frame in case on
failed user access, just like handle_signal32().

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/signal_32.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index d1087dd87174..495bee1b713d 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -754,7 +754,6 @@ int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
struct rt_sigframe __user *rt_sf;
struct mcontext __user *frame;
struct mcontext __user *tm_frame = NULL;
- void __user *addr;
unsigned long newsp = 0;
int sigret;
unsigned long tramp;
@@ -769,7 +768,6 @@ int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
/* Set up Signal Frame */
/* Put a Real Time Context onto stack */
rt_sf = get_sigframe(ksig, tsk, sizeof(*rt_sf), 1);
- addr = rt_sf;
if (!access_ok(rt_sf, sizeof(*rt_sf)))
goto badframe;

@@ -784,7 +782,6 @@ int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,

/* Save user registers on the stack */
frame = &rt_sf->uc.uc_mcontext;
- addr = frame;
if (vdso32_rt_sigtramp && tsk->mm->context.vdso_base) {
sigret = 0;
tramp = tsk->mm->context.vdso_base + vdso32_rt_sigtramp;
@@ -820,7 +817,6 @@ int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,

/* create a stack frame for the caller of the handler */
newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16);
- addr = (void __user *)regs->gpr[1];
if (put_user(regs->gpr[1], (u32 __user *)newsp))
goto badframe;

@@ -837,7 +833,7 @@ int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
return 0;

badframe:
- signal_fault(tsk, regs, "handle_rt_signal32", addr);
+ signal_fault(tsk, regs, "handle_rt_signal32", rt_sf);

return 1;
}
--
2.25.0
\
 
 \ /
  Last update: 2020-08-12 14:07    [W:0.070 / U:6.588 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site