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 211CC372231; Sat, 28 Feb 2026 17:58:04 +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=1772301484; cv=none; b=nipq1FHF7A/CH1Xeta/pRQTGUTzbtIvIAWQg+2cv1gAWp7e0wOvUymrdA+LpFvO3rI/QVY+REJa3F+aGQXUPgz32HyRlNIARUE93m4anr0Opwe1hbffgd5LyTICrzfz/xXvdLBV+CUG/VtY7lCCyPXJinOkw11/YJfEtdWfbp6E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772301484; c=relaxed/simple; bh=rHQyhSkZLfruEDSRgKCaCdndA1wB7IyQXgtVqkS4znY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=L2nVUqcvNGt6gX0tiltiMEhVe0JyzC+THRyaM5iT1KMICmXJ+eDTJy5V8DB5LZ/SA8Yl30E+sU+I13rg3SwFla+QWXP1bUb8TL+48AkR6KNeH4WJsppt9ImdWaKX8sIdlb6l7ofqaZNUOtLvCL/n1lUCmLxEiyCqjNF1RDJt79s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dyVEmROY; 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="dyVEmROY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 559FFC116D0; Sat, 28 Feb 2026 17:58:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772301484; bh=rHQyhSkZLfruEDSRgKCaCdndA1wB7IyQXgtVqkS4znY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dyVEmROYzoHgyRbRpGTj0N49Ml3IUwpAjuoRqQb6k+wttIWyPYmGFr2lxLi9JxjdC dH3sV7BjW850vE1OV1Nh6/S5WdzJq6kTwoZlFMtpNYdRv0m/D+2Y+9ECBOqeA0dxJD xdEj91mRF6OOo4QpkOY+CBMtXj+JtRBysOolbNUin8DOvpvS6htCqfvYb7Ykt3nmdS 2aKiGNWJyHpnxH0ZdoENDbDXKBSMuvVe0t9JvkqhOnjl1Z/La5Gk2v/0ezK00girc9 lOangpKFamgk4RXJzn0eWs+dDITrh1LdR+PESG0jhbZ2KstIvRGNIENqAgULTd368i vrLjrPoHhE9IA== From: Sasha Levin To: patches@lists.linux.dev Cc: Sunday Clement , Alexander Deucher , Alex Deucher , stable@vger.kernel.org, Sasha Levin Subject: [PATCH 6.18 669/752] drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set() Date: Sat, 28 Feb 2026 12:46:20 -0500 Message-ID: <20260228174750.1542406-669-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: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Sunday Clement [ Upstream commit 8a70a26c9f34baea6c3199a9862ddaff4554a96d ] 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 Signed-off-by: Sasha Levin --- 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 82905f3e54ddd..261db87e86fe6 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