Messages in this thread Patch in this message | | | From | Dmitry Monakhov <> | Subject | Re: [PATCH] fs: make generic_block_fiemap sig-tolerant PING2... | Date | Wed, 10 Dec 2014 16:49:18 +0300 |
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Hello. Someone please take care of this patch.
W/o that patch unprivileged user may abuse system resources simply by spawning wast number of unkilable busyloops (works on ext2/ext3):
truncate --size 1T test for ((i=0;i<1024;i++)) do filefrag test > /dev/null & done
Dmitry Monakhov <dmonakhov@openvz.org> writes: > Andrew can you please get this patch. IMHO it is simple and clean. > BTW: > >> __generic_block_fiemap may spin very long time for large sparse files. >> >> Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> >> --- >> fs/ioctl.c | 5 +++++ >> 1 files changed, 5 insertions(+), 0 deletions(-) >> >> diff --git a/fs/ioctl.c b/fs/ioctl.c >> index 8ac3fad..6fbeb68 100644 >> --- a/fs/ioctl.c >> +++ b/fs/ioctl.c >> @@ -379,6 +379,11 @@ int __generic_block_fiemap(struct inode *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 */ >> -- >> 1.7.1 [unhandled content-type:application/pgp-signature]
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