Date: Sun, 12 Dec 1999 18:55:49 -0800 (PST) From: Tor Egge <tegge@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/kern sys_pipe.c Message-ID: <199912130255.SAA67596@freefall.freebsd.org>
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tegge 1999/12/12 18:55:49 PST
Modified files:
sys/kern sys_pipe.c
Log:
Fix two problems with pipe_write():
1. Data written beyond end of pipe buffer, causing kernel memory corruption.
- Check that space is still valid after obtaining the pipe lock.
- Defer the calculation of transfer size until the pipe
lock has been obtained.
- Update the pipe buffer pointers while holding the pipe lock.
2. Writes of size <= PIPE_BUF not always atomic.
- Allow an internal write to span two contiguous segments,
so writes of size <= PIPE_BUF can be kept atomic
when wrapping around from the end to the start of the
pipe buffer.
PR: 15235
Reviewed by: Matt Dillon <dillon@FreeBSD.org>
Revision Changes Path
1.59 +65 -24 src/sys/kern/sys_pipe.c
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