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Fix crash in LZMA module when the Sandbox is enabled.

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This patch fixes a crash in our LZMA module where liblzma will allocate
slightly more data than it is allowed to by its limit, which leads to a
crash.

See: https://bugs.torproject.org/22751
This commit is contained in:
Alexander Færøy 2017-06-28 09:57:58 -04:00
parent 2cd49d9ea6
commit c239b2fc9c
2 changed files with 13 additions and 2 deletions
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5
changes/bug22751 Normal file
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@ -0,0 +1,5 @@
o Major bugfixes (compression):
- Fix crash in LZMA module, when the Sandbox is enabled, where
liblzma would allocate more than 16 MB of memory. We solve this
by bumping the mprotect() limit in the Sandbox module from 16 MB
to 20 MB. Fixes bug 22751; bugfix on 0.3.1.1-alpha.

10
src/common/sandbox.c
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@ -19,8 +19,14 @@
#define _LARGEFILE64_SOURCE
#endif
/** Malloc mprotect limit in bytes. */
#define MALLOC_MP_LIM (16*1024*1024)
/** Malloc mprotect limit in bytes.
*
* 28/06/2017: This value was increased from 16 MB to 20 MB after we introduced
* LZMA support in Tor (0.3.1.1-alpha). We limit our LZMA coder to 16 MB, but
* liblzma have a small overhead that we need to compensate for to avoid being
* killed by the sandbox.
*/
#define MALLOC_MP_LIM (20*1024*1024)
#include <stdio.h>
#include <string.h>