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authorDavid Miller <davem@redhat.com>2018-10-25 20:36:46 -0700
committerDavid S. Miller <davem@davemloft.net>2018-10-26 15:04:41 -0700
commit5b4fc3882a649c9411dd0dcad2ddb78e911d340e (patch)
tree1e4d71d14473c440a48f1fbfdcd465cf478fc2f4 /arch/sparc/kernel/signal_64.c
parentcaf539cd1087f7c36b9c4df271575e9aee49fde5 (diff)
downloadlinux-5b4fc3882a649c9411dd0dcad2ddb78e911d340e.tar.bz2
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/signal_64.c')
-rw-r--r--arch/sparc/kernel/signal_64.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/sparc/kernel/signal_64.c b/arch/sparc/kernel/signal_64.c
index 48366e5eb5b2..e9de1803a22e 100644
--- a/arch/sparc/kernel/signal_64.c
+++ b/arch/sparc/kernel/signal_64.c
@@ -370,7 +370,11 @@ setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
get_sigframe(ksig, regs, sf_size);
if (invalid_frame_pointer (sf)) {
- do_exit(SIGILL); /* won't return, actually */
+ if (show_unhandled_signals)
+ pr_info("%s[%d] bad frame in setup_rt_frame: %016lx TPC %016lx O7 %016lx\n",
+ current->comm, current->pid, (unsigned long)sf,
+ regs->tpc, regs->u_regs[UREG_I7]);
+ force_sigsegv(ksig->sig, current);
return -EINVAL;
}