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 8498A3F871C; Fri, 15 May 2026 16:12:54 +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=1778861574; cv=none; b=Y5j7aiBRTC2+lP0QwLqtW4czHE714LySiKF8oVtZIuLbtoQcHvx17+refJ9WYYnMl8FbK5BELYKae9u5tOnYUhA3t/VIkQU+I8oCwlTv0ROycTvdkMOL4HGdfAiiudId3ufGdWMB8n/Hzghz6SQqsr3dqd4lHDBOM4m0GyvsIRE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778861574; c=relaxed/simple; bh=vJ9yP/Ta0Dyg5aag/dEiu5GO0AJswFVJDPtgNVpwnd4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=qkysFLLIHtd1J5wJ4yQTIk5BdtlfnxGHQcQrbOiLPZYZxNkVGyFbjNq4UM4cfShEBrL3JulnaS5nOplwufavNxpmbRc039cIdTHEkOPewIkZsOIIWhSYJgJS0ec5c/qZTO5Nd57ZHk9+0InX9+3lnW1xmNzFjr6oBkRWNtJZ0Rs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=wIJrVqxB; 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="wIJrVqxB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1A7A1C2BCB0; Fri, 15 May 2026 16:12:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778861574; bh=vJ9yP/Ta0Dyg5aag/dEiu5GO0AJswFVJDPtgNVpwnd4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wIJrVqxBSw0nd0x5RYaFvTvbp8Sbb7bBxRoMldKd6eMaS1su+x+640AuLxDH5RE0q gJ4U2WYLIPnMZew89MDHHIjre618RgoshcbktmmVGh5jYi6Xj4cLZo+fpEgQIj7LJ4 SnXFP2ijn69FfU16HqNWEDmW+4vm9BmN8Rj//KpI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Amir Shetaia , =?UTF-8?q?Christian=20K=C3=B6nig?= , Alex Deucher Subject: [PATCH 6.6 340/474] drm/amdkfd: Clear VRAM on allocation to prevent stale data exposure Date: Fri, 15 May 2026 17:47:29 +0200 Message-ID: <20260515154722.371750394@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260515154715.053014143@linuxfoundation.org> References: <20260515154715.053014143@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Amir Shetaia commit ad52d61d82181dbdb7f05826de38352d5e550cc2 upstream. KFD VRAM allocations set AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE but not AMDGPU_GEM_CREATE_VRAM_CLEARED, leaving freshly allocated VRAM with stale data from prior use observable by compute kernels. The GEM ioctl path already sets VRAM_CLEARED for all userspace allocations via amdgpu_gem_create_ioctl() and amdgpu_mode_dumb_create(). The KFD path was missing this flag, allowing stale page table remnants to leak into user buffers. This causes crashes in RCCL P2P transport where non-zero data in ptrExchange/head/tail fields corrupts the protocol handshake. Signed-off-by: Amir Shetaia Reviewed-by: Christian König Signed-off-by: Alex Deucher Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c @@ -1665,7 +1665,8 @@ int amdgpu_amdkfd_gpuvm_alloc_memory_of_ alloc_domain = AMDGPU_GEM_DOMAIN_GTT; alloc_flags = 0; } else { - alloc_flags = AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE; + alloc_flags = AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE | + AMDGPU_GEM_CREATE_VRAM_CLEARED; alloc_flags |= (flags & KFD_IOC_ALLOC_MEM_FLAGS_PUBLIC) ? AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED : 0; }