[PATCH 3.12 17/83] ARC: SA_SIGINFO ucontext regs off-by-one

From: Jiri Slaby
Date: Mon Apr 27 2015 - 17:52:28 EST

From: Vineet Gupta <vgupta@xxxxxxxxxxxx>

3.12-stable review patch. If anyone has any objections, please let me know.


commit 6914e1e3f63caa829431160f0f7093292daef2d5 upstream.

The regfile provided to SA_SIGINFO signal handler as ucontext was off by
one due to pt_regs gutter cleanups in 2013.

Before handling signal, user pt_regs are copied onto user_regs_struct and copied
back later. Both structs are binary compatible. This was all fine until
commit 2fa919045b72 (ARC: pt_regs update #2) which removed the empty stack slot
at top of pt_regs (corresponding to first pad) and made the corresponding
fixup in struct user_regs_struct (the pad in there was moved out of
@scratch - not removed altogether as it is part of ptrace ABI)

struct user_regs_struct {
+ long pad;
struct {
- long pad;
long bta, lp_start, lp_end,....
} scratch;

This meant that now user_regs_struct was off by 1 reg w.r.t pt_regs and
signal code needs to user_regs_struct.scratch to reflect it as pt_regs,
which is what this commit does.

This problem was hidden for 2 years, because both save/restore, despite
using wrong location, were using the same location. Only an interim
inspection (reproducer below) exposed the issue.

void handle_segv(int signo, siginfo_t *info, void *context)
ucontext_t *uc = context;
struct user_regs_struct *regs = &(uc->uc_mcontext.regs);

printf("regs %x %x\n", <=== prints 7 8 (vs. 8 9)
regs->scratch.r8, regs->scratch.r9);

int main()
struct sigaction sa;

sa.sa_sigaction = handle_segv;
sa.sa_flags = SA_SIGINFO;
sigaction(SIGSEGV, &sa, NULL);

asm volatile(
"mov r7, 7 \n"
"mov r8, 8 \n"
"mov r9, 9 \n"
"mov r10, 10 \n"

*((unsigned int*)0x10) = 0;

Fixes: 2fa919045b72ec892e "ARC: pt_regs update #2: Remove unused gutter at start of pt_regs"
Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
arch/arc/kernel/signal.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arc/kernel/signal.c b/arch/arc/kernel/signal.c
index 7e95e1a86510..d68b410595c8 100644
--- a/arch/arc/kernel/signal.c
+++ b/arch/arc/kernel/signal.c
@@ -67,7 +67,7 @@ stash_usr_regs(struct rt_sigframe __user *sf, struct pt_regs *regs,
sigset_t *set)
int err;
- err = __copy_to_user(&(sf->uc.uc_mcontext.regs), regs,
+ err = __copy_to_user(&(sf->uc.uc_mcontext.regs.scratch), regs,
err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(sigset_t));

@@ -83,7 +83,7 @@ static int restore_usr_regs(struct pt_regs *regs, struct rt_sigframe __user *sf)
if (!err)

- err |= __copy_from_user(regs, &(sf->uc.uc_mcontext.regs),
+ err |= __copy_from_user(regs, &(sf->uc.uc_mcontext.regs.scratch),

return err;

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