diff options
| author | Jose Ricardo Ziviani <joserz@linux.vnet.ibm.com> | 2017-01-31 20:05:17 -0200 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2017-02-16 15:29:30 +0100 |
| commit | 26920a2961f7cc86bfbdb2184c0ec261d5629c2f (patch) | |
| tree | 2ada2985c606d7b19b0b6cca105d2e5a951a0832 | |
| parent | 35f2fd04ce8bd3eaad4b7790abb19fa2a56d7314 (diff) | |
linux-user: fill target sigcontext struct accordingly
A segfault is noticed when an emulated program uses any of ucontext
regs fields. Risu detected this issue in the following operation when
handling a signal:
ucontext_t *uc = (ucontext_t*)uc;
uc->uc_mcontext.regs->nip += 4;
but this works fine:
uc->uc_mcontext.gp_regs[PT_NIP] += 4;
This patch set regs to a valid location as well as other sigcontext
fields.
Signed-off-by: Jose Ricardo Ziviani <joserz@linux.vnet.ibm.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <1485900317-3256-1-git-send-email-joserz@linux.vnet.ibm.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
| -rw-r--r-- | linux-user/signal.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/linux-user/signal.c b/linux-user/signal.c index 5064de0c08..8209539555 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -5155,6 +5155,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka, target_ulong rt_sf_addr, newsp = 0; int i, err = 0; #if defined(TARGET_PPC64) + struct target_sigcontext *sc = 0; struct image_info *image = ((TaskState *)thread_cpu->opaque)->info; #endif @@ -5183,6 +5184,10 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka, #if defined(TARGET_PPC64) mctx = &rt_sf->uc.tuc_sigcontext.mcontext; trampptr = &rt_sf->trampoline[0]; + + sc = &rt_sf->uc.tuc_sigcontext; + __put_user(h2g(mctx), &sc->regs); + __put_user(sig, &sc->signal); #else mctx = &rt_sf->uc.tuc_mcontext; trampptr = (uint32_t *)&rt_sf->uc.tuc_mcontext.tramp; |