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Add missing checks to some of pageinspect's BRIN functions

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brin_page_type() and brin_metapage_info() did not enforce being called
by superuser, like other pageinspect functions that take bytea do.
Since they don't verify the passed page thoroughly, it is possible to
use them to read the server memory with a carefully crafted bytea value,
up to a file kilobytes from where the input bytea is located.

Have them throw errors if called by a non-superuser.

Report and initial patch: Andreas Seltenreich

Security: CVE-2016-3065
This commit is contained in:
Alvaro Herrera 2016-03-28 10:57:42 -03:00
parent 86ebf30fd6
commit 3e1338475f
1 changed files with 23 additions and 2 deletions
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25
contrib/pageinspect/brinfuncs.c
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@ -46,8 +46,23 @@ brin_page_type(PG_FUNCTION_ARGS)
{
bytea *raw_page = PG_GETARG_BYTEA_P(0);
Page page = VARDATA(raw_page);
int raw_page_size;
char *type;
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be superuser to use raw page functions"))));
raw_page_size = VARSIZE(raw_page) - VARHDRSZ;
if (raw_page_size != BLCKSZ)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("input page too small"),
errdetail("Expected size %d, got %d",
BLCKSZ, raw_page_size)));
switch (BrinPageType(page))
{
case BRIN_PAGETYPE_META:
@ -79,11 +94,12 @@ verify_brin_page(bytea *raw_page, uint16 type, const char *strtype)
raw_page_size = VARSIZE(raw_page) - VARHDRSZ;
if (raw_page_size < SizeOfPageHeaderData)
if (raw_page_size != BLCKSZ)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("input page too small"),
errdetail("Expected size %d, got %d", raw_page_size, BLCKSZ)));
errdetail("Expected size %d, got %d",
BLCKSZ, raw_page_size)));
page = VARDATA(raw_page);
@ -316,6 +332,11 @@ brin_metapage_info(PG_FUNCTION_ARGS)
bool nulls[4];
HeapTuple htup;
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be superuser to use raw page functions"))));
page = verify_brin_page(raw_page, BRIN_PAGETYPE_META, "metapage");
/* Build a tuple descriptor for our result type */