HomeFreeBSD

amd64: clear PSL.AC in the right frame

Description

amd64: clear PSL.AC in the right frame

If copyin family of routines fault, kernel does clear PSL.AC on the
fault entry, but the AC flag of the faulted frame is kept intact. Since
onfault handler is effectively jump, AC survives until syscall exit.

Reported by: m00nbsd, via Sony
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
admbugs: 975

(cherry picked from commit 91aae953cb807d6fb7a70782b323bf9beb60d7c9)

Details

Provenance
kibAuthored on May 22 2021, 7:48 PM
markjCommitted on May 26 2021, 7:29 PM
Parents
rGfcb09b40339d: alc(4): add support for Mikrotik 10/25G NIC
Branches
Unknown
Tags
Unknown