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CVE-2024-33599: nscd: Stack-based buffer overflow in netgroup cache (bug 31677)

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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 87801a8fd0)
This commit is contained in:
Florian Weimer 2024-04-25 15:00:45 +02:00
parent 29e20bd122
commit 5968aebb86
1 changed files with 3 additions and 2 deletions
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5
nscd/netgroupcache.c
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@ -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,