From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D2C111C68F; Mon, 4 May 2026 14:15:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777904128; cv=none; b=C3GFxGoBNtdJtVB+8bgqrOAtsul6z8+H2/lMmxk8kOTInfTSoznu3hc+pIqGvg2+0LHSVFdT4Ar0bCHgj0qi84JErdfmv1NSaCkuNXlvuWN+myXMsHV59YY0EgXzzVSfaYxbcAvLzeFr2JvFMCWCyVPI0cZpA+8SYCDs64QTdYo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777904128; c=relaxed/simple; bh=rum3pUC+gv1GbwVpErrRNN/Jmqxfywsv2hX3pBuEA/U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=puhUfyDaAAhLwhEWGwb38mVKv6BwboOLzjeXMr1pwT/Y43yeeYjbefLdK2Jd8gkBc5Ds1odd9DVHc3O0EwyrGeFOnwAYOvRKQqQHE7fc73Iza1xgmx8Y1ealCEbeXuW/SiUDxV2Q4eSbtMzsYRqbNWVhsSTlTVcuRDgAqtmxRDY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=xxhRf8C7; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="xxhRf8C7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6A158C2BCC4; Mon, 4 May 2026 14:15:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1777904128; bh=rum3pUC+gv1GbwVpErrRNN/Jmqxfywsv2hX3pBuEA/U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xxhRf8C7uMBpqBofkpP1HlRBHPnys9qC6Dvv5HVI4oAJmHJlV8BKq9wt2a9ISYV84 EtK5bKjqsSTXnCh9TglUYbGKWmtS40vOmozBT4xIsM5PNtTcJVsRUGo4Awu0t0D5Qw YMbyW8lBtzF6ClaQdBn7sgmit59EE1E/eaRt3QwQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Uladzislau Rezki (Sony)" , Baoquan He , chenyichong , Andrew Morton Subject: [PATCH 6.18 161/275] mm/vmalloc: take vmap_purge_lock in shrinker Date: Mon, 4 May 2026 15:51:41 +0200 Message-ID: <20260504135149.028306219@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260504135142.929052779@linuxfoundation.org> References: <20260504135142.929052779@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Uladzislau Rezki (Sony) commit ec05f51f1e65bce95528543eb73fda56fd201d94 upstream. decay_va_pool_node() can be invoked concurrently from two paths: __purge_vmap_area_lazy() when pools are being purged, and the shrinker via vmap_node_shrink_scan(). However, decay_va_pool_node() is not safe to run concurrently, and the shrinker path currently lacks serialization, leading to races and possible leaks. Protect decay_va_pool_node() by taking vmap_purge_lock in the shrinker path to ensure serialization with purge users. Link: https://lore.kernel.org/20260413192646.14683-1-urezki@gmail.com Fixes: 7679ba6b36db ("mm: vmalloc: add a shrinker to drain vmap pools") Signed-off-by: Uladzislau Rezki (Sony) Reviewed-by: Baoquan He Cc: chenyichong Cc: Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- mm/vmalloc.c | 1 + 1 file changed, 1 insertion(+) --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -5255,6 +5255,7 @@ vmap_node_shrink_scan(struct shrinker *s { struct vmap_node *vn; + guard(mutex)(&vmap_purge_lock); for_each_vmap_node(vn) decay_va_pool_node(vn, true);