The patch titled
Subject: fsioctl.c: make generic_block_fiemap() signal-tolerant
has been added to the -mm tree. Its filename is
fs-make-generic_block_fiemap-sig-tolerant.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/fs-make-generic_block_fiemap-sig-tolerant.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/fs-make-generic_block_fiemap-sig-tolerant.patch
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The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
Subject: fsioctl.c: make generic_block_fiemap() signal-tolerant
__generic_block_fiemap may spin very long time for large sparse files.
Without this patch an unprivileged user may abuse system resources simply
by spawning a vast number of unkilable busyloops (works on ext2/ext3):
truncate --size 1T test
for ((i=0;i<1024;i++))
do
filefrag test > /dev/null &
done
Signed-off-by: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ioctl.c | 5 +++++
1 file changed, 5 insertions(+)
diff -puN fs/ioctl.c~fs-make-generic_block_fiemap-sig-tolerant fs/ioctl.c
--- a/fs/ioctl.c~fs-make-generic_block_fiemap-sig-tolerant
+++ a/fs/ioctl.c
@@ -379,6 +379,11 @@ int __generic_block_fiemap(struct inode
past_eof = true;
}
cond_resched();
+ if (fatal_signal_pending(current)) {
+ ret = -EINTR;
+ break;
+ }
+
} while (1);
/* If ret is 1 then we just hit the end of the extent array */
_
Patches currently in -mm which might be from dmonakhov@xxxxxxxxxx are
origin.patch
fs-make-generic_block_fiemap-sig-tolerant.patch
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