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| author | Ian Dowse <iedowse@FreeBSD.org> | 2003-03-28 02:50:10 +0000 |
|---|---|---|
| committer | Ian Dowse <iedowse@FreeBSD.org> | 2003-03-28 02:50:10 +0000 |
| commit | 6205bf3107dc1918c3d09ff87a8e9989f01e2e0f (patch) | |
| tree | 30c3acce3e8fb42b966dd12505c6284f5d7c6b04 /sys/sys/msgbuf.h | |
| parent | c591e5ebeedfe5a6d9f0186dd5dc92f8442d7af8 (diff) | |
| download | src-6205bf3107dc1918c3d09ff87a8e9989f01e2e0f.tar.gz src-6205bf3107dc1918c3d09ff87a8e9989f01e2e0f.zip | |
Add a checksum to the kernel message buffer, and update it every
time a character is written. Use this at boot time to reject the
existing buffer contents if they are corrupt. This fixes a problem
seen on some hardware (especially laptops) where the message buffer
gets partially corrupted during a short power cycle or reset, but
the msgbuf structure is left intact so it gets reused, resulting
in random junk and control characters appearing in dmesg and
/var/log/messages.
PR: kern/28497
Notes
Notes:
svn path=/head/; revision=112732
Diffstat (limited to 'sys/sys/msgbuf.h')
| -rw-r--r-- | sys/sys/msgbuf.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/sys/msgbuf.h b/sys/sys/msgbuf.h index e6f6da22806a..22bd16110190 100644 --- a/sys/sys/msgbuf.h +++ b/sys/sys/msgbuf.h @@ -44,6 +44,7 @@ struct msgbuf { int msg_bufx; /* write pointer */ int msg_bufr; /* read pointer */ char *msg_ptr; /* pointer to buffer */ + u_int msg_cksum; /* checksum of contents */ }; #ifdef _KERNEL |