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authorMax Filippov <jcmvbkbc@gmail.com>2023-08-02 10:49:47 -0700
committerWaldemar Brodkorb <wbx@openadk.org>2023-08-03 10:13:51 +0200
commiteb532bc1b7a635932fe5cef472d0442620a173a2 (patch)
treed7ce4e30c8f8202e48389c4fe26f6497018638a3 /INSTALL
parent7ecdaaad7835dc22c255839dac3b92093defb54f (diff)
linuxthreads/signal: improve sigaction behavior
Setting signal handler in the kernel and then updating sighandler[sig] results in a crash if a signal which handler is being changed from SIG_DFL to a non-default was pending. Improve the race a little and update the sighandler[sig] before the sigaction syscall. It doesn't eliminate the race entirely, but fixes this particular failing case. E.g. this fixes the 100% reproducible segfault in the busybox hush shell built with FEATURE_EDITING_WINCH on ssh client's terminal window resize, but in that case there's one more even bigger issue: busybox calls sigaction with both old and new signal pointers pointing to the same structure instance, as a result act->sa_handler after the sigaction syscall is not what the user requested, but the previous handler. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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