diff options
| author | David Woodhouse <dwmw2@shinybook.infradead.org> | 2005-08-27 10:23:46 +0100 |
|---|---|---|
| committer | David Woodhouse <dwmw2@shinybook.infradead.org> | 2005-08-27 10:23:46 +0100 |
| commit | 17888225c2f392bfdbac6c7f0713cbd9a4d02b05 (patch) | |
| tree | cf11f005d3a973be9fd06eec243ded4b776c1502 | |
| parent | 3c789a19054034847afe80af2f23ebb0eebfbad6 (diff) | |
Fix missing audit_syscall_exit() on ppc64 sigsuspend exit path
When we leave sigsuspend() directly into a signal handler, we don't want
to go via the normal syscall exit path -- it'll corrupt r4 and r5 which
are supposed to be giving information to the signal handler, and it'll
give us one more single-step SIGTRAP than we need if single-stepping is
in operation.
However, we _should_ be calling audit_syscall_exit(), which would
normally get invoked in that patch. It's not wonderfully pretty, but I
suspect the best answer is just to call it directly...
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
| -rw-r--r-- | arch/ppc64/kernel/asm-offsets.c | 1 | ||||
| -rw-r--r-- | arch/ppc64/kernel/entry.S | 16 |
2 files changed, 13 insertions, 4 deletions
diff --git a/arch/ppc64/kernel/asm-offsets.c b/arch/ppc64/kernel/asm-offsets.c index abb9e5b5da0..6f910fa2746 100644 --- a/arch/ppc64/kernel/asm-offsets.c +++ b/arch/ppc64/kernel/asm-offsets.c @@ -68,6 +68,7 @@ int main(void) DEFINE(THREAD_USED_VR, offsetof(struct thread_struct, used_vr)); #endif /* CONFIG_ALTIVEC */ DEFINE(MM, offsetof(struct task_struct, mm)); + DEFINE(AUDITCONTEXT, offsetof(struct task_struct, audit_context)); DEFINE(DCACHEL1LINESIZE, offsetof(struct ppc64_caches, dline_size)); DEFINE(DCACHEL1LOGLINESIZE, offsetof(struct ppc64_caches, log_dline_size)); diff --git a/arch/ppc64/kernel/entry.S b/arch/ppc64/kernel/entry.S index b61572eb2a7..ae5d563ad93 100644 --- a/arch/ppc64/kernel/entry.S +++ b/arch/ppc64/kernel/entry.S @@ -276,12 +276,20 @@ _GLOBAL(ppc64_rt_sigsuspend) _GLOBAL(ppc32_rt_sigsuspend) bl .save_nvgprs bl .sys32_rt_sigsuspend - /* If sigsuspend() returns zero, we are going into a signal handler */ 70: cmpdi 0,r3,0 - beq .ret_from_except - /* If it returned -EINTR, we need to return via syscall_exit to set + /* If it returned an error, we need to return via syscall_exit to set the SO bit in cr0 and potentially stop for ptrace. */ - b syscall_exit + bne syscall_exit + /* If sigsuspend() returns zero, we are going into a signal handler. We + may need to call audit_syscall_exit() to mark the exit from sigsuspend() */ + ld r3,PACACURRENT(r13) + ld r4,AUDITCONTEXT(r3) + cmpdi 0,r4,0 + beq .ret_from_except /* No audit_context: Leave immediately. */ + li r4, 2 /* AUDITSC_FAILURE */ + li r5,-4 /* It's always -EINTR */ + bl .audit_syscall_exit + b .ret_from_except _GLOBAL(ppc_fork) bl .save_nvgprs |