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| author | Noah Misch <noah@leadboat.com> | 2014-02-17 09:33:31 -0500 |
|---|---|---|
| committer | Noah Misch <noah@leadboat.com> | 2014-02-17 09:33:37 -0500 |
| commit | 0b7026d964c79515c8df00b37ab41d550bcdcbde (patch) | |
| tree | d7da8c1299e1168454b05be8f88897ea3ebfc221 /src/include/utils/varbit.h | |
| parent | 6a10e57b0f79678243f42e2a6033723975aa8530 (diff) | |
| download | postgresql-0b7026d964c79515c8df00b37ab41d550bcdcbde.tar.gz postgresql-0b7026d964c79515c8df00b37ab41d550bcdcbde.zip | |
Predict integer overflow to avoid buffer overruns.
Several functions, mostly type input functions, calculated an allocation
size such that the calculation wrapped to a small positive value when
arguments implied a sufficiently-large requirement. Writes past the end
of the inadvertent small allocation followed shortly thereafter.
Coverity identified the path_in() vulnerability; code inspection led to
the rest. In passing, add check_stack_depth() to prevent stack overflow
in related functions.
Back-patch to 8.4 (all supported versions). The non-comment hstore
changes touch code that did not exist in 8.4, so that part stops at 9.0.
Noah Misch and Heikki Linnakangas, reviewed by Tom Lane.
Security: CVE-2014-0064
Diffstat (limited to 'src/include/utils/varbit.h')
| -rw-r--r-- | src/include/utils/varbit.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/include/utils/varbit.h b/src/include/utils/varbit.h index e329d52e247..58727c66b9a 100644 --- a/src/include/utils/varbit.h +++ b/src/include/utils/varbit.h @@ -15,6 +15,8 @@ #ifndef VARBIT_H #define VARBIT_H +#include <limits.h> + #include "fmgr.h" /* @@ -53,6 +55,11 @@ typedef struct /* Number of bytes needed to store a bit string of a given length */ #define VARBITTOTALLEN(BITLEN) (((BITLEN) + BITS_PER_BYTE-1)/BITS_PER_BYTE + \ VARHDRSZ + VARBITHDRSZ) +/* + * Maximum number of bits. Several code sites assume no overflow from + * computing bitlen + X; VARBITTOTALLEN() has the largest such X. + */ +#define VARBITMAXLEN (INT_MAX - BITS_PER_BYTE + 1) /* pointer beyond the end of the bit string (like end() in STL containers) */ #define VARBITEND(PTR) (((bits8 *) (PTR)) + VARSIZE(PTR)) /* Mask that will cover exactly one byte, i.e. BITS_PER_BYTE bits */ |