Commit f6a592e8 authored Sep 26, 2007 by Chris Malley Committed by Linus Torvalds Sep 26, 2007

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>

parent 78bd8fbb

Documentation/lguest/lguest.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -882,7 +882,7 @@ static u32 handle_block_output(int fd, const struct iovec *iov,
		* of the block file (possibly extending it). */
		if (off + len > device_len) {
		/* Trim it back to the correct length */
		ftruncate(dev->fd, device_len);
		ftruncate64(dev->fd, device_len);
		/* Die, bad Guest, die. */
		errx(1, "Write past end %llu+%u", off, len);
		}