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| author | Florian Weimer <fweimer@redhat.com> | 2024-04-25 15:00:45 +0200 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2024-04-25 15:47:20 +0200 |
| commit | 7a95873543ce225376faf13bb71c43dea6d24f86 (patch) | |
| tree | 417a98fa03ae2af75fc6c27522d79aef89d9f8e8 | |
| parent | 36280d1ce5e245aabefb877fe4d3c6cff95dabfa (diff) | |
| download | glibc-7a95873543ce225376faf13bb71c43dea6d24f86.tar.gz glibc-7a95873543ce225376faf13bb71c43dea6d24f86.tar.xz glibc-7a95873543ce225376faf13bb71c43dea6d24f86.zip | |
CVE-2024-33599: nscd: Stack-based buffer overflow in netgroup cache (bug 31677)
Using alloca matches what other caches do. The request length is bounded by MAXKEYLEN. Reviewed-by: Carlos O'Donell <carlos@redhat.com> (cherry picked from commit 87801a8fd06db1d654eea3e4f7626ff476a9bdaa)
| -rw-r--r-- | nscd/netgroupcache.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c index 85977521a6..f0de064368 100644 --- a/nscd/netgroupcache.c +++ b/nscd/netgroupcache.c @@ -502,12 +502,13 @@ 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; + /* The alloca is safe because nscd_run_worker verfies that + key_len is not larger than MAXKEYLEN. */ + dataset = alloca (sizeof (*dataset) + req->key_len); } datahead_init_pos (&dataset->head, sizeof (*dataset) + req->key_len, |