The following faulty behavior was observed. The sandbox configured with CONFIG_SANDBOX_CRASH_RESET=y was invoked with
./u-boot -T -S
After executing `exception undefined' the sandbox reboots. When executing `exception undefined' the sandbox exits with SIGSEGV.
The expected behavior is that the sandbox should reboot again.
If we are relaunching the sandbox in a signal handler, we have to unblock the respective signal before calling execv(). See signal(7) man-page.
Signed-off-by: Heinrich Schuchardt heinrich.schuchardt@canonical.com --- arch/sandbox/cpu/os.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/arch/sandbox/cpu/os.c b/arch/sandbox/cpu/os.c index f937991139..2c7aeea070 100644 --- a/arch/sandbox/cpu/os.c +++ b/arch/sandbox/cpu/os.c @@ -1012,8 +1012,24 @@ void *os_find_text_base(void) return base; }
+/** + * os_unblock_signals() - unblock all signals + * + * If we are relaunching the sandbox in a signal handler, we have to unblock + * the respective signal before calling execv(). See signal(7) man-page. + */ +static void os_unblock_signals(void) +{ + sigset_t sigs; + + sigfillset(&sigs); + sigprocmask(SIG_UNBLOCK, &sigs, NULL); +} + void os_relaunch(char *argv[]) { + os_unblock_signals(); + execv(argv[0], argv); os_exit(1); }