* [PATCH] lguest example launcher truncates block device file to 0 length on problems
@ 2007-09-26 4:19 Rusty Russell
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From: Rusty Russell @ 2007-09-26 4:19 UTC (permalink / raw)
To: Linus Torvalds; +Cc: lkml - Kernel Mailing List, lguest, Chris Malley
From: Chris Malley <mail@chrismalley.co.uk>
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>
diff -r bcbb99849fd9 Documentation/lguest/lguest.c
--- a/Documentation/lguest/lguest.c Wed Sep 26 12:21:40 2007 +1000
+++ b/Documentation/lguest/lguest.c Wed Sep 26 14:15:38 2007 +1000
@@ -882,7 +882,7 @@ static u32 handle_block_output(int fd, c
* 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);
}
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