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authorRichard Weinberger <richard@nod.at>2013-05-17 14:21:01 +0200
committerRichard Weinberger <richard@nod.at>2013-07-19 10:45:18 +0200
commit0974a9cadc7886f7baaa458bb0c89f5c5f9d458e (patch)
treedaf5e00929c889654b8eb8974b9e42ca77deea70 /arch/um
parentdee20035b42d569984d2c16041b51e4d75e233b5 (diff)
downloadlinux-linaro-stable-0974a9cadc7886f7baaa458bb0c89f5c5f9d458e.tar.gz
um: Fix wait_stub_done() error handling
If we die within a stub handler we only way to reliable kill the (obviously) dying uml guest process is killing it's host twin on the host side. Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um')
-rw-r--r--arch/um/os-Linux/skas/process.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 4625949bf1e4..441e4ba074f4 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -54,7 +54,7 @@ static int ptrace_dump_regs(int pid)
void wait_stub_done(int pid)
{
- int n, status, err;
+ int n, status, err, bad_stop = 0;
while (1) {
CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED | __WALL));
@@ -74,6 +74,8 @@ void wait_stub_done(int pid)
if (((1 << WSTOPSIG(status)) & STUB_DONE_MASK) != 0)
return;
+ else
+ bad_stop = 1;
bad_wait:
err = ptrace_dump_regs(pid);
@@ -83,7 +85,10 @@ bad_wait:
printk(UM_KERN_ERR "wait_stub_done : failed to wait for SIGTRAP, "
"pid = %d, n = %d, errno = %d, status = 0x%x\n", pid, n, errno,
status);
- fatal_sigsegv();
+ if (bad_stop)
+ kill(pid, SIGKILL);
+ else
+ fatal_sigsegv();
}
extern unsigned long current_stub_stack(void);