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| author |   visa <visa@openbsd.org> | 2019-01-06 12:59:45 +0000 |
|---|---|---|
| committer | visa <visa@openbsd.org> | 2019-01-06 12:59:45 +0000 |
| commit | ec412da11be49c25266553c64da7e06a018ba909 (patch) | |
| tree | 448321fd2d08343c136e4be46e6c0fcbf75db7c3 /lib/libc | |
| parent | Rewrite ip_pcbopts() to fill a fresh mbuf with the ip options instead (diff) | |
| download | wireguard-openbsd-ec412da11be49c25266553c64da7e06a018ba909.tar.xz wireguard-openbsd-ec412da11be49c25266553c64da7e06a018ba909.zip | |
Fix unsafe use of ptsignal() in mi_switch().
ptsignal() has to be called with the kernel lock held. As ensuring the
locking in mi_switch() is not easy, and deferring the signaling using
the task API is not possible because of lock order issues in
mi_switch(), move the CPU time checking into a periodic timer where
the kernel can be locked without issues.
With this change, each process has a dedicated resource check timer.
The timer gets activated only when a CPU time limit is set. Because the
checking is not done as frequently as before, some precision is lost.
Use of timers adapted from FreeBSD.
OK tedu@
Reported-by: syzbot+2f5d62256e3280634623@syzkaller.appspotmail.com
Diffstat (limited to 'lib/libc')
0 files changed, 0 insertions, 0 deletions