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Prevent pattern matching abuse (CVE-2024-31228)

This commit is contained in:
Oran Agra 2024-10-02 20:11:01 +03:00 committed by YaacovHazan
parent 8ec5da785b
commit 472d8a0df5
2 changed files with 12 additions and 3 deletions
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9
src/util.c
View File

@ -56,8 +56,11 @@
/* Glob-style pattern matching. */
static int stringmatchlen_impl(const char *pattern, int patternLen,
const char *string, int stringLen, int nocase, int *skipLongerMatches)
const char *string, int stringLen, int nocase, int *skipLongerMatches, int nesting)
{
/* Protection against abusive patterns. */
if (nesting > 1000) return 0;
while(patternLen && stringLen) {
switch(pattern[0]) {
case '*':
@ -69,7 +72,7 @@ static int stringmatchlen_impl(const char *pattern, int patternLen,
return 1; /* match */
while(stringLen) {
if (stringmatchlen_impl(pattern+1, patternLen-1,
string, stringLen, nocase, skipLongerMatches))
string, stringLen, nocase, skipLongerMatches, nesting+1))
return 1; /* match */
if (*skipLongerMatches)
return 0; /* no match */
@ -191,7 +194,7 @@ static int stringmatchlen_impl(const char *pattern, int patternLen,
int stringmatchlen(const char *pattern, int patternLen,
const char *string, int stringLen, int nocase) {
int skipLongerMatches = 0;
return stringmatchlen_impl(pattern,patternLen,string,stringLen,nocase,&skipLongerMatches);
return stringmatchlen_impl(pattern,patternLen,string,stringLen,nocase,&skipLongerMatches,0);
}
int stringmatch(const char *pattern, const char *string, int nocase) {

6
tests/unit/keyspace.tcl
View File

@ -509,6 +509,12 @@ foreach {type large} [array get largevalue] {
r KEYS "a*a*a*a*a*a*a*a*a*a*a*a*a*a*a*a*a*a*a*a*b"
} {}
test {Regression for pattern matching very long nested loops} {
r flushdb
r SET [string repeat "a" 50000] 1
r KEYS [string repeat "*?" 50000]
} {}
test {Coverage: basic SWAPDB test and unhappy path} {
r flushall
r select 0