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fsioctl.c: make generic_block_fiemap() signal-tolerant

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__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 <[email protected]>
Cc: Theodore Ts'o <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Michael Kerrisk <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dmitry Monakhov 2015-02-10 14:09:29 -08:00 • committed by Linus Torvalds
commit 913e027ca1
2 changed files with 7 additions and 1 deletions
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5
fs/ioctl.c
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@ -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 */