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authorDmitry Monakhov2015-02-10 14:09:29 -0800
committerLinus Torvalds2015-02-10 14:30:30 -0800
commit913e027ca17ee06fa9436a21e54464795b0fa0e8 (patch)
treed583200d611573204224ac54bb7f7f1a633950ef /init
parent99b8874e79619498ade354357f64299768642af6 (diff)
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@openvz.org> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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