From: Florian Weimer <fweimer@redhat.com>
To: libc-alpha@sourceware.org
Subject: [PATCH 1/4] nscd: Stack-based buffer overflow in netgroup cache (bug 31677)
Date: Wed, 24 Apr 2024 18:08:37 +0200 [thread overview]
Message-ID: <73a91330cea898a1d48c0033ffcdb2cf8e6fbc4c.1713974801.git.fweimer@redhat.com> (raw)
In-Reply-To: <cover.1713974801.git.fweimer@redhat.com>
Using alloca matches what other caches do. The request length is
bounded by MAXKEYLEN.
---
nscd/netgroupcache.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
index 0c6e46f15c..24fbac7668 100644
--- a/nscd/netgroupcache.c
+++ b/nscd/netgroupcache.c
@@ -502,12 +502,11 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
= (struct indataset *) mempool_alloc (db,
sizeof (*dataset) + req->key_len,
1);
- struct indataset dataset_mem;
bool cacheable = true;
if (__glibc_unlikely (dataset == NULL))
{
cacheable = false;
- dataset = &dataset_mem;
+ dataset = alloca (sizeof (*dataset) + req->key_len);
}
datahead_init_pos (&dataset->head, sizeof (*dataset) + req->key_len,
--
2.44.0
next prev parent reply other threads:[~2024-04-24 16:08 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-24 16:08 [PATCH 0/4] Various nscd security fixes Florian Weimer
2024-04-24 16:08 ` Florian Weimer [this message]
2024-04-24 16:27 ` [PATCH 1/4] nscd: Stack-based buffer overflow in netgroup cache (bug 31677) Siddhesh Poyarekar
2024-04-24 16:08 ` [PATCH 2/4] nscd: Do not send missing not-found response in addgetnetgrentX (bug 31678) Florian Weimer
2024-04-24 16:35 ` Siddhesh Poyarekar
2024-04-24 16:08 ` [PATCH 3/4] nscd: Avoid null pointer crashes after notfound response " Florian Weimer
2024-04-24 16:39 ` Siddhesh Poyarekar
2024-04-24 16:08 ` [PATCH 4/4] nscd: netgroup: Use two buffers in addgetnetgrentX (bug 31680) Florian Weimer
2024-04-24 16:48 ` Siddhesh Poyarekar
2024-04-24 20:53 ` [PATCH 0/4] Various nscd security fixes Carlos O'Donell
2024-04-26 0:10 ` Cristian Rodríguez
2024-04-26 8:10 ` Florian Weimer
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