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 BA8E8355049 for ; Sat, 28 Feb 2026 17:50:31 +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=1772301031; cv=none; b=TXjYECY63vvKt46HyfdB6iFQzod0DHjssnK6IOQsTabUtQtrNKFUN6TAPw+3nQAeb/HXWTt6EeGiUYFzWSPKDrZWcHcgvqu0D1shKd5LXyMVgfrGYpFh/EUbIf3Xd18YJ9yFatpkXqfvSLV+vNeeTHZ+zWHqyY3it4RDU/VChgI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772301031; c=relaxed/simple; bh=T9FGvJhnf/Nzrx56iXUJ+P2/8aqv2CDO+boMUZgDRfw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TklOMi/5f3RwW7usrQiMyVzwWOGj/20VYBSoc/DRYWibUEjC3Yo1wun2YR7cVQ5/LDs//kHiAYARjMC7z5A3q1TqeFQfyNExsT0/hkyRH3gaLqFmD31T2DijcZ9Wny5cRNC3hh/xh3q35VIjIPcST4CcDzkUDiw/KasfDs5M1+I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=efYMmLor; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="efYMmLor" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 08A58C19423; Sat, 28 Feb 2026 17:50:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772301031; bh=T9FGvJhnf/Nzrx56iXUJ+P2/8aqv2CDO+boMUZgDRfw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=efYMmLorXpq50ZYEQx7hBcPCgCCBtWzXTPsyBlSLZAT6mVypZaXCG3wg1LO2H+6Ot glOupue9QBey10OJR1HpeyG5VioxyhjGk0BdEIqbkZW1qpjcPc5/W20Cuajf9p8PKq L08O6C6vSfb3UYiGzBqmbljqXKfT3h6p3MNEBtbWqed0Euz+V9RsUrS+JAP7OKV/oB 8jfha6nr30A4cXmPjUFQ4sGGACjjyJOnhU4nyYdtkfGaKP23kRo8wuk/hcQhzzckHm IZ/CTXIoi8TZxExx6ZGDJWHYRxUj7BuAaJzl8QVoGqGT4PhWhj7uu2gIj6u4osE0H6 4lkerwKrsWNZA== From: Sasha Levin To: patches@lists.linux.dev Cc: Xiao Kan <814091656@qq.com>, Xiao Kan , Maxime Ripard , Sasha Levin Subject: [PATCH 6.18 169/752] drm: Account property blob allocations to memcg Date: Sat, 28 Feb 2026 12:38:00 -0500 Message-ID: <20260228174750.1542406-169-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260228174750.1542406-1-sashal@kernel.org> References: <20260228174750.1542406-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Xiao Kan <814091656@qq.com> [ Upstream commit 26b4309a3ab82a0697751cde52eb336c29c19035 ] DRM_IOCTL_MODE_CREATEPROPBLOB allows userspace to allocate arbitrary-sized property blobs backed by kernel memory. Currently, the blob data allocation is not accounted to the allocating process's memory cgroup, allowing unprivileged users to trigger unbounded kernel memory consumption and potentially cause system-wide OOM. Mark the property blob data allocation with GFP_KERNEL_ACCOUNT so that the memory is properly charged to the caller's memcg. This ensures existing cgroup memory limits apply and prevents uncontrolled kernel memory growth without introducing additional policy or per-file limits. Signed-off-by: Xiao Kan <814091656@qq.com> Signed-off-by: Xiao Kan Link: https://patch.msgid.link/tencent_D12AA2DEDE6F359E1AF59405242FB7A5FD05@qq.com Signed-off-by: Maxime Ripard Signed-off-by: Sasha Levin --- drivers/gpu/drm/drm_property.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_property.c b/drivers/gpu/drm/drm_property.c index 596272149a359..3c88b5fbdf28c 100644 --- a/drivers/gpu/drm/drm_property.c +++ b/drivers/gpu/drm/drm_property.c @@ -562,7 +562,7 @@ drm_property_create_blob(struct drm_device *dev, size_t length, if (!length || length > INT_MAX - sizeof(struct drm_property_blob)) return ERR_PTR(-EINVAL); - blob = kvzalloc(sizeof(struct drm_property_blob)+length, GFP_KERNEL); + blob = kvzalloc(sizeof(struct drm_property_blob) + length, GFP_KERNEL_ACCOUNT); if (!blob) return ERR_PTR(-ENOMEM); -- 2.51.0