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 73B7024728E; Sat, 3 Jan 2026 17:25:36 +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=1767461136; cv=none; b=nZYi6fiFHiH0dUyodSOe5XQ+D+D2SrCxTdwOtg+Z6FLxXCc/ymr27zPihMYVeP8YkEMfNucTBCQtkhnc1LMSEJMlVfuktpHRMV3TeOSGt6FWug/vUMFg1dPaKwuAkD1Ya8rCObGz/KDy/PyLeJ0fb0tOFU0j+LoUq4LmVZToQPM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767461136; c=relaxed/simple; bh=6WZ0AOXtP02BpTrVImKKq/I9TOcXb2K0dpB3xUXTtm0=; h=Date:To:From:Subject:Message-Id; b=DzHRZ9ZnWdtYsPJJUSA2e0hO99zLvGS7EKJ1llkIukxXsiXEOLcPt9py4U89wpYxlOlv0IJ6U8KDDvpSV3d2EJ/dwFalTUmA56mCgInT7xqa6I6HL7oHWT/2Gk1Gs+jWV4iab1VBt4UT0JAi8vZQhcjPtt9GJkcRLm6QCEmfToo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=SisapzQ8; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="SisapzQ8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DBF29C113D0; Sat, 3 Jan 2026 17:25:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1767461136; bh=6WZ0AOXtP02BpTrVImKKq/I9TOcXb2K0dpB3xUXTtm0=; h=Date:To:From:Subject:From; b=SisapzQ8GQwwWNjyAf47iWmdZAvU0kDz7J6PdxWZnAw9pXYHYxSyXVMUpGfyFFjJp 1ysHWFwJqpkrpAIv6j6MtxWVau5sTIdDqgvrXl7ENK7OTAhWmP4MYaIZzZWpFoHw/7 vex5IOFH5VCriBXKX74DHX0NXuht5hzFEwZ/kvXk= Date: Sat, 03 Jan 2026 09:25:35 -0800 To: mm-commits@vger.kernel.org,will@kernel.org,stable@vger.kernel.org,mark.rutland@arm.com,leitao@debian.org,coxu@redhat.com,catalin.marinas@arm.com,yeoreum.yun@arm.com,akpm@linux-foundation.org From: Andrew Morton Subject: + arm64-kernel-initialize-missing-kexec_buf-random-field.patch added to mm-hotfixes-unstable branch Message-Id: <20260103172535.DBF29C113D0@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: arm64: kernel: initialize missing kexec_buf->random field has been added to the -mm mm-hotfixes-unstable branch. Its filename is arm64-kernel-initialize-missing-kexec_buf-random-field.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arm64-kernel-initialize-missing-kexec_buf-random-field.patch This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Yeoreum Yun Subject: arm64: kernel: initialize missing kexec_buf->random field Date: Mon, 1 Dec 2025 10:51:18 +0000 Commit bf454ec31add ("kexec_file: allow to place kexec_buf randomly") introduced the kexec_buf->random field to enable random placement of kexec_buf. However, this field was never properly initialized for kexec images that do not need to be placed randomly, leading to the following UBSAN warning: [ +0.364528] ------------[ cut here ]------------ [ +0.000019] UBSAN: invalid-load in ./include/linux/kexec.h:210:12 [ +0.000131] load of value 2 is not a valid value for type 'bool' (aka '_Bool') [ +0.000003] CPU: 4 UID: 0 PID: 927 Comm: kexec Not tainted 6.18.0-rc7+ #3 PREEMPT(full) [ +0.000002] Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015 [ +0.000000] Call trace: [ +0.000001] show_stack+0x24/0x40 (C) [ +0.000006] __dump_stack+0x28/0x48 [ +0.000002] dump_stack_lvl+0x7c/0xb0 [ +0.000002] dump_stack+0x18/0x34 [ +0.000001] ubsan_epilogue+0x10/0x50 [ +0.000002] __ubsan_handle_load_invalid_value+0xc8/0xd0 [ +0.000003] locate_mem_hole_callback+0x28c/0x2a0 [ +0.000003] kexec_locate_mem_hole+0xf4/0x2f0 [ +0.000001] kexec_add_buffer+0xa8/0x178 [ +0.000002] image_load+0xf0/0x258 [ +0.000001] __arm64_sys_kexec_file_load+0x510/0x718 [ +0.000002] invoke_syscall+0x68/0xe8 [ +0.000001] el0_svc_common+0xb0/0xf8 [ +0.000002] do_el0_svc+0x28/0x48 [ +0.000001] el0_svc+0x40/0xe8 [ +0.000002] el0t_64_sync_handler+0x84/0x140 [ +0.000002] el0t_64_sync+0x1bc/0x1c0 To address this, initialise kexec_buf->random field properly. Link: https://lkml.kernel.org/r/20251201105118.2786335-1-yeoreum.yun@arm.com Fixes: bf454ec31add ("kexec_file: allow to place kexec_buf randomly") Signed-off-by: Yeoreum Yun Suggested-by: Breno Leitao Reviewed-by: Breno Leitao Cc: Catalin Marinas Cc: Coiby Xu Cc: levi.yun Cc: Marc Rutland Cc: Will Deacon Cc: Signed-off-by: Andrew Morton --- arch/arm64/kernel/kexec_image.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/arm64/kernel/kexec_image.c~arm64-kernel-initialize-missing-kexec_buf-random-field +++ a/arch/arm64/kernel/kexec_image.c @@ -41,7 +41,7 @@ static void *image_load(struct kimage *i struct arm64_image_header *h; u64 flags, value; bool be_image, be_kernel; - struct kexec_buf kbuf; + struct kexec_buf kbuf = {}; unsigned long text_offset, kernel_segment_number; struct kexec_segment *kernel_segment; int ret; _ Patches currently in -mm which might be from yeoreum.yun@arm.com are arm64-kernel-initialize-missing-kexec_buf-random-field.patch