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| author | David Miller <davem@redhat.com> | 2018-10-25 20:36:46 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-10-26 15:04:41 -0700 |
| commit | 5b4fc3882a649c9411dd0dcad2ddb78e911d340e (patch) | |
| tree | 1e4d71d14473c440a48f1fbfdcd465cf478fc2f4 /arch/sparc/kernel/rtrap_64.S | |
| parent | caf539cd1087f7c36b9c4df271575e9aee49fde5 (diff) | |
| download | linux-5b4fc3882a649c9411dd0dcad2ddb78e911d340e.tar.gz | |
sparc64: Make corrupted user stacks more debuggable.
Right now if we get a corrupted user stack frame we do a do_exit(SIGILL) which is not helpful. If under a debugger, this behavior causes the inferior process to exit. So the register and other state cannot be examined at the time of the event. Instead, conditionally log a rate limited kernel log message and then force a SIGSEGV. With bits and ideas borrowed (as usual) from powerpc. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/kernel/rtrap_64.S')
| -rw-r--r-- | arch/sparc/kernel/rtrap_64.S | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/sparc/kernel/rtrap_64.S b/arch/sparc/kernel/rtrap_64.S index 4073e2b87dd0..29aa34f11720 100644 --- a/arch/sparc/kernel/rtrap_64.S +++ b/arch/sparc/kernel/rtrap_64.S @@ -39,6 +39,7 @@ __handle_preemption: wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate __handle_user_windows: + add %sp, PTREGS_OFF, %o0 call fault_in_user_windows 661: wrpr %g0, RTRAP_PSTATE, %pstate /* If userspace is using ADI, it could potentially pass |