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lguest example launcher truncates block device file to 0 length on problems 

The function should also use ftruncate64() rather than ftruncate() to prevent
files over 4GB (not uncommon for a root filesystem) being zeroed.

Signed-off-by: Chris Malley <mail@chrismalley.co.uk>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Chris Malley 2007-09-26 14:19:18 +10:00 committed by Linus Torvalds
parent 78bd8fbbcd
commit f6a592e8ab
1 changed files with 1 additions and 1 deletions
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2
Documentation/lguest/lguest.c
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@ -882,7 +882,7 @@ static u32 handle_block_output(int fd, const struct iovec *iov,
* of the block file (possibly extending it). */ * of the block file (possibly extending it). */
if (off + len > device_len) { if (off + len > device_len) {
/* Trim it back to the correct length */ /* Trim it back to the correct length */
ftruncate(dev->fd, device_len); ftruncate64(dev->fd, device_len);
/* Die, bad Guest, die. */ /* Die, bad Guest, die. */
errx(1, "Write past end %llu+%u", off, len); errx(1, "Write past end %llu+%u", off, len);
} }