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 2397A19D07A for ; Sun, 1 Mar 2026 01:45:24 +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=1772329524; cv=none; b=UAAXeRGgWdYGJ3d1u61EZr1QZmXa0CzkZzv7kpErqUwKLQFxizy5nEy6YhKzS3nmUVFWJvKoA56O3S8ICy0YKq1wyCETSF+4w93bfxoDeIdwXQodEAfr5hAvZMJ+3fF5LnALZYNdIkyWewJpLt27YeX9jS5qWyVwC/ZMhMEdv2M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772329524; c=relaxed/simple; bh=nmSfmUk2vTOuP/UDO0LJGxOzJ5e/h1JIAxQOjdzJ6HY=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=NBstCFedZGEJDU8y5J2EzBWj1UDZdinlbp8HHLyidP2tkBKw+qt7wk80qnuCHVTejwaUEu+Q9Q4gXsFmv0hlmY/gu6+O5rYqKYbKWlSDiPrnbpsvt/S00QpY/5mDyDXiW4QVobcc1si4B2wd0NKaPHOOPlZqEIbjAplD1wZjdwU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=sk4J0P1d; 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="sk4J0P1d" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 52F64C19421; Sun, 1 Mar 2026 01:45:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772329524; bh=nmSfmUk2vTOuP/UDO0LJGxOzJ5e/h1JIAxQOjdzJ6HY=; h=From:To:Cc:Subject:Date:From; b=sk4J0P1dgPWDOg3I+BIFbGmfeqgVICKVSR0ySN7ShQClsHQ4GRcbQgCyMUcRAqCuH mJBigPtQvzWf91Wu6Xr3j4x5dBW05KRFxtbjpMQigBWFuL3xaKnVZB4oyhgImuzYbf WWl7NloKwE8UIUyMzRAsIW8yDikuxqOAyCq7M6FR/eA2H0I8NNYPbg7/KfAhG7ibJm lD4XdrJI6gtDrtRJWHskMCSGee38jJWuRtAjg8fT70wwW9LQJH7RtM1gzzbxYV5rHl 2thGRcu92aZ419imOjKS8O1wInSCufuTGI9a1WJfGROGBRqlI9F58MD5xAAs6utbms hIZHn/hD4XT4Q== From: Sasha Levin To: stable@vger.kernel.org, Sunday.Clement@amd.com Cc: Alexander Deucher , Alex Deucher , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: FAILED: Patch "drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set()" failed to apply to 6.1-stable tree Date: Sat, 28 Feb 2026 20:45:21 -0500 Message-ID: <20260301014522.1707955-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From 8a70a26c9f34baea6c3199a9862ddaff4554a96d Mon Sep 17 00:00:00 2001 From: Sunday Clement Date: Mon, 2 Feb 2026 12:41:39 -0500 Subject: [PATCH] drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set() The kfd_event_page_set() function writes KFD_SIGNAL_EVENT_LIMIT * 8 bytes via memset without checking the buffer size parameter. This allows unprivileged userspace to trigger an out-of bounds kernel memory write by passing a small buffer, leading to potential privilege escalation. Signed-off-by: Sunday Clement Reviewed-by: Alexander Deucher Signed-off-by: Alex Deucher Cc: stable@vger.kernel.org --- drivers/gpu/drm/amd/amdkfd/kfd_events.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_events.c index 1ad312af8ff0c..13416bff77636 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_events.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_events.c @@ -331,6 +331,12 @@ static int kfd_event_page_set(struct kfd_process *p, void *kernel_address, if (p->signal_page) return -EBUSY; + if (size < KFD_SIGNAL_EVENT_LIMIT * 8) { + pr_err("Event page size %llu is too small, need at least %lu bytes\n", + size, (unsigned long)(KFD_SIGNAL_EVENT_LIMIT * 8)); + return -EINVAL; + } + page = kzalloc(sizeof(*page), GFP_KERNEL); if (!page) return -ENOMEM; -- 2.51.0