68 lines
2.6 KiB
Diff
68 lines
2.6 KiB
Diff
From a30d367a71b7017581cf1ca104242a3c644dec0f Mon Sep 17 00:00:00 2001
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From: Oran Agra <oran@redislabs.com>
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Date: Sun, 26 Sep 2021 15:42:17 +0300
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Subject: [PATCH] Fix Integer overflow issue with intsets (CVE-2021-32687)
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The vulnerability involves changing the default set-max-intset-entries
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configuration parameter to a very large value and constructing specially
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crafted commands to manipulate sets
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---
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src/intset.c | 4 +++-
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src/rdb.c | 4 +++-
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src/t_set.c | 5 ++++-
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3 files changed, 10 insertions(+), 3 deletions(-)
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diff --git a/src/intset.c b/src/intset.c
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index 19f6562ed69c..3f8b754e3a3e 100644
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--- a/src/intset.c
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+++ b/src/intset.c
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@@ -34,6 +34,7 @@
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#include "intset.h"
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#include "zmalloc.h"
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#include "endianconv.h"
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+#include "redisassert.h"
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/* Note that these encodings are ordered, so:
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* INTSET_ENC_INT16 < INTSET_ENC_INT32 < INTSET_ENC_INT64. */
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@@ -103,7 +104,8 @@ intset *intsetNew(void) {
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/* Resize the intset */
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static intset *intsetResize(intset *is, uint32_t len) {
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- uint32_t size = len*intrev32ifbe(is->encoding);
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+ uint64_t size = (uint64_t)len*intrev32ifbe(is->encoding);
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+ assert(size <= SIZE_MAX - sizeof(intset));
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is = zrealloc(is,sizeof(intset)+size);
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return is;
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}
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diff --git a/src/rdb.c b/src/rdb.c
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index 82b4cf5065d1..ecd2c0e9870a 100644
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--- a/src/rdb.c
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+++ b/src/rdb.c
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@@ -1518,7 +1518,9 @@ robj *rdbLoadObject(int rdbtype, rio *rdb, sds key) {
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if ((len = rdbLoadLen(rdb,NULL)) == RDB_LENERR) return NULL;
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/* Use a regular set when there are too many entries. */
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- if (len > server.set_max_intset_entries) {
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+ size_t max_entries = server.set_max_intset_entries;
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+ if (max_entries >= 1<<30) max_entries = 1<<30;
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+ if (len > max_entries) {
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o = createSetObject();
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/* It's faster to expand the dict to the right size asap in order
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* to avoid rehashing */
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diff --git a/src/t_set.c b/src/t_set.c
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index f32565e41102..eea45c8df2d8 100644
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--- a/src/t_set.c
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+++ b/src/t_set.c
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@@ -66,7 +66,10 @@ int setTypeAdd(robj *subject, sds value) {
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if (success) {
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/* Convert to regular set when the intset contains
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* too many entries. */
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- if (intsetLen(subject->ptr) > server.set_max_intset_entries)
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+ size_t max_entries = server.set_max_intset_entries;
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+ /* limit to 1G entries due to intset internals. */
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+ if (max_entries >= 1<<30) max_entries = 1<<30;
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+ if (intsetLen(subject->ptr) > max_entries)
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setTypeConvert(subject,OBJ_ENCODING_HT);
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return 1;
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}
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