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Predict integer overflow to avoid buffer overruns.

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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
This commit is contained in:
Noah Misch
2014-02-17 09:33:31 -05:00
parent e4a4fa2235
commit 7a362a176a
15 changed files with 177 additions and 19 deletions
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21
contrib/hstore/hstore_io.c
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@ -13,6 +13,7 @@
#include "utils/builtins.h"
#include "utils/json.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/typcache.h"
#include "hstore.h"
@ -439,6 +440,11 @@ hstore_recv(PG_FUNCTION_ARGS)
PG_RETURN_POINTER(out);
}
if (pcount < 0 || pcount > MaxAllocSize / sizeof(Pairs))
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("number of pairs (%d) exceeds the maximum allowed (%d)",
pcount, (int) (MaxAllocSize / sizeof(Pairs)))));
pairs = palloc(pcount * sizeof(Pairs));
for (i = 0; i < pcount; ++i)
@ -554,6 +560,13 @@ hstore_from_arrays(PG_FUNCTION_ARGS)
TEXTOID, -1, false, 'i',
&key_datums, &key_nulls, &key_count);
/* see discussion in hstoreArrayToPairs() */
if (key_count > MaxAllocSize / sizeof(Pairs))
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("number of pairs (%d) exceeds the maximum allowed (%d)",
key_count, (int) (MaxAllocSize / sizeof(Pairs)))));
/* value_array might be NULL */
if (PG_ARGISNULL(1))
@ -676,6 +689,13 @@ hstore_from_array(PG_FUNCTION_ARGS)
count = in_count / 2;
/* see discussion in hstoreArrayToPairs() */
if (count > MaxAllocSize / sizeof(Pairs))
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("number of pairs (%d) exceeds the maximum allowed (%d)",
count, (int) (MaxAllocSize / sizeof(Pairs)))));
pairs = palloc(count * sizeof(Pairs));
for (i = 0; i < count; ++i)
@ -807,6 +827,7 @@ hstore_from_record(PG_FUNCTION_ARGS)
my_extra->ncolumns = ncolumns;
}
Assert(ncolumns <= MaxTupleAttributeNumber); /* thus, no overflow */
pairs = palloc(ncolumns * sizeof(Pairs));
if (rec)