Date: Thu, 27 Mar 2003 18:50:10 -0800 (PST) From: Ian Dowse <iedowse@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/sys msgbuf.h src/sys/kern subr_prf.c Message-ID: <200303280250.h2S2oAim038046@repoman.freebsd.org>
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iedowse 2003/03/27 18:50:10 PST
FreeBSD src repository
Modified files:
sys/sys msgbuf.h
sys/kern subr_prf.c
Log:
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
Revision Changes Path
1.99 +24 -4 src/sys/kern/subr_prf.c
1.20 +1 -0 src/sys/sys/msgbuf.h
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