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selinux: add __GFP_NOWARN to hashtab_init() allocations

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As reported by syzbot, hashtab_init() can be affected by abnormally
large policy loads which would cause the kernel's allocator to emit
a warning in some configurations.  Since the SELinux hashtab_init()
code handles the case where the allocation fails, due to a large
request or some other reason, we can safely add the __GFP_NOWARN flag
to squelch these abnormally large allocation warnings.

Reported-by: syzbot+bc2c99c2929c3d219fb3@syzkaller.appspotmail.com
Tested-by: syzbot+bc2c99c2929c3d219fb3@syzkaller.appspotmail.com
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Paul Moore
2025-06-18 12:17:33 -04:00
parent 951b2de06a
commit 9ab71d9204
1 changed files with 2 additions and 1 deletions
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3
security/selinux/ss/hashtab.c
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@@ -40,7 +40,8 @@ int hashtab_init(struct hashtab *h, u32 nel_hint)
h->htable = NULL;
if (size) {
h->htable = kcalloc(size, sizeof(*h->htable), GFP_KERNEL);
h->htable = kcalloc(size, sizeof(*h->htable),
GFP_KERNEL | __GFP_NOWARN);
if (!h->htable)
return -ENOMEM;
h->size = size;