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v0.5.1
https://github.com/torvalds/linux
02 December 2023, 22:23:51 UTC
Revision 94f563c426a78c97fc2a377315995e6ec8343872 authored by Diego Calleja on 05 August 2006, 19:14:55 UTC, committed by Linus Torvalds on 06 August 2006, 15:57:48 UTC 
[PATCH] Fix BeFS slab corruption
 
In bugzilla #6941, Jens Kilian reported:

"The function befs_utf2nls (in fs/befs/linuxvfs.c) writes a 0 byte past the
end of a block of memory allocated via kmalloc(), leading to memory
corruption.  This happens only for filenames which are pure ASCII and a
multiple of 4 bytes in length.  [...]

Without DEBUG_SLAB, this leads to further corruption and hard lockups; I
believe this is the bug which has made kernels later than 2.6.8 unusable
for me.  (This must be due to changes in memory management, the bug has
been in the BeFS driver since the time it was introduced (AFAICT).)

Steps to reproduce:
Create a directory (in BeOS, naturally :-) with files named, e.g.,
"1", "22", "333", "4444", ...  Mount it in Linux and do an "ls" or "find""

This patch implements the suggested fix. Credits to Jens Kilian for
debugging the problem and finding the right fix.

Signed-off-by: Diego Calleja <diegocg@gmail.com>
Cc: Jens Kilian <jjk@acm.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1 parent e31f59c
History
Tip revision: 94f563c426a78c97fc2a377315995e6ec8343872 authored by Diego Calleja on 05 August 2006, 19:14:55 UTC
[PATCH] Fix BeFS slab corruption
Tip revision: 94f563c
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