linux-kernel - Re: [External] [PATCH 04/20] mm: zswap: warn when referencing a dead entry

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Tue, 30 Jan 2024 11:39:02 +0800
From: Chengming Zhou <zhouchengming@...edance.com>
To: Johannes Weiner <hannes@...xchg.org>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: Nhat Pham <nphamcs@...il.com>, Yosry Ahmed <yosryahmed@...gle.com>,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [External] [PATCH 04/20] mm: zswap: warn when referencing a dead
 entry

On 2024/1/30 09:36, Johannes Weiner wrote:
> Put a standard sanity check on zswap_entry_get() for UAF scenario.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Reviewed-by: Chengming Zhou <zhouchengming@...edance.com>

> ---
>  mm/zswap.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/mm/zswap.c b/mm/zswap.c
> index 9f05282efe3c..0c6adaf2fdb6 100644
> --- a/mm/zswap.c
> +++ b/mm/zswap.c
> @@ -542,6 +542,7 @@ static void zswap_entry_free(struct zswap_entry *entry)
>  /* caller must hold the tree lock */
>  static void zswap_entry_get(struct zswap_entry *entry)
>  {
> +	WARN_ON_ONCE(!entry->refcount);
>  	entry->refcount++;
>  }
>