Note: This commit series is stuff salvaged from jhibbits' local tree. Apologies for the malformed commit messages, Piotr and I were discussing them in IRC earlier and I was under the mistaken assumption that they would get reworded before the push.
On Wed, Dec 30, 2020, at 4:45 PM, Piotr Kubaj wrote: > The branch main has been updated by pkubaj (ports committer): > > URL: > https://cgit.FreeBSD.org/src/commit/?id=76ff03aef7411e601673dfc997bd6d691bd9a14e > > commit 76ff03aef7411e601673dfc997bd6d691bd9a14e > Author: Justin Hibbits <[email protected]> > AuthorDate: 2020-12-08 22:49:25 +0000 > Commit: Piotr Kubaj <[email protected]> > CommitDate: 2020-12-30 22:45:44 +0000 > > powerpc: Fix copyin/copyout race condition > > It's possible for a context switch, and CPU migration, to occur between > fetching the PCPU context and extracting the pc_curpcb. This can cause > the fault handler to be installed for the wrong thread, leading to a > panic in copyin()/copyout(). Since curthread is already in %r13, just > use that directly, as GPRs are migrated, so there is no migration race > risk. -- Brandon Bergren [email protected] _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/dev-commits-src-all To unsubscribe, send any mail to "[email protected]"
