| commit | 2f41503d647629cfafea42cf6f827e4139536703 | [log] [tgz] |
|---|---|---|
| author | Kumar Kartikeya Dwivedi <memxor@gmail.com> | Thu Apr 10 08:31:42 2025 -0700 |
| committer | Alexei Starovoitov <ast@kernel.org> | Thu Apr 10 12:51:10 2025 -0700 |
| tree | a358232751e16230b804094cfeb38b43ec5411d7 | |
| parent | 92b90f780d056a28f3c751c2dfbcd9540c7ae28a [diff] |
bpf: Convert queue_stack map to rqspinlock Replace all usage of raw_spinlock_t in queue_stack_maps.c with rqspinlock. This is a map type with a set of open syzbot reports reproducing possible deadlocks. Prior attempt to fix the issues was at [0], but was dropped in favor of this approach. Make sure we return the -EBUSY error in case of possible deadlocks or timeouts, just to make sure user space or BPF programs relying on the error code to detect problems do not break. With these changes, the map should be safe to access in any context, including NMIs. [0]: https://lore.kernel.org/all/20240429165658.1305969-1-sidchintamaneni@gmail.com Reported-by: syzbot+8bdfc2c53fb2b63e1871@syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/0000000000004c3fc90615f37756@google.com Reported-by: syzbot+252bc5c744d0bba917e1@syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/000000000000c80abd0616517df9@google.com Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20250410153142.2064340-1-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>