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 69B564A341C; Sat, 28 Feb 2026 17:55:10 +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=1772301310; cv=none; b=biuOIUlF0NnkC1/IsFp6wjpXPgmZMIiQkAZEuXX6ro7HiulhtV7+oiZQHPv4FJIjqZDqMIjl0r6/B7JX0HdLot1PheqVlCV5ubcIGYNmj8wwvIDg9QTiNJiIegvk8g3C0AJfEbJH3boZZzp33av01SIoQROot1CYr1ZKkAdheWg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772301310; c=relaxed/simple; bh=XMJpDTLdhtk0HnBKXtLfwrh8DmxRCR19o+jYxY50M94=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ofgWfC9zlEMXrgHnGcAaSn6UaJfi/IvgJp5AHwfReh5rS+snHmY0oOvD/E3F8FWAEjgMi0Vps2VoeazOVDuswH4tinBqjmHDzrYyiHOUTKzx9LFSz6LA7zvGes4lV7yOVe3mrb1FBGJSDERBxVhJBvmwWZyX9d4OfOWVTdG5cJI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=s2dBcI7e; 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="s2dBcI7e" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7C348C116D0; Sat, 28 Feb 2026 17:55:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772301310; bh=XMJpDTLdhtk0HnBKXtLfwrh8DmxRCR19o+jYxY50M94=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=s2dBcI7eQZilL31ko7zBv8DIbMoTcjyruPCG1pWc6rxPBLC9Nq/EOcdZXkTcLF9t5 O5l1i5o7CCADbFiMLfafoOkQWvbzil+LXoPlXhOtUeaU7nU0cXz+nL7zTTyBc/BF+1 zbEudck9Tuwt2QIlcBzUeUVSfFNv3MJ/xtDVZeGCP7bdl6B4kjYHSLGEUI/m6dhHDo owYNMT9rRlGajMm7+aeGRdGIUOrntACP0x/TlhGU3sbWkKMm6zb6ig71ppUPk6jzuP UIB62Z2ZkbYenpErRfwSmHCe0BDBSwbF28RnLlOWlM9bMrVjJFpFh0xTuDYY1LssCb sM47USZvqOSYw== From: Sasha Levin To: patches@lists.linux.dev Cc: Yeoreum Yun , Breno Leitao , stable@vger.kernel.org, Andrew Morton , Pratyush Yadav , Will Deacon , Sasha Levin Subject: [PATCH 6.18 495/752] arm64: kernel: initialize missing kexec_buf->random field Date: Sat, 28 Feb 2026 12:43:26 -0500 Message-ID: <20260228174750.1542406-495-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: Yeoreum Yun [ Upstream commit 15dd20dda979ebab72f6df97845828e78d63ab91 ] 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. Fixes: bf454ec31add ("kexec_file: allow to place kexec_buf randomly") Suggested-by: Breno Leitao Cc: stable@vger.kernel.org Signed-off-by: Yeoreum Yun Reviewed-by: Breno Leitao Link: https://lore.kernel.org/all/oninomspajhxp4omtdapxnckxydbk2nzmrix7rggmpukpnzadw@c67o7njgdgm3/ [1] Link: https://lore.kernel.org/all/20250825180531.94bfb86a26a43127c0a1296f@linux-foundation.org/ [2] Link: https://lkml.kernel.org/r/20250826-akpm-v1-1-3c831f0e3799@debian.org Signed-off-by: Breno Leitao Suggested-by: Andrew Morton Signed-off-by: Andrew Morton Reviewed-by: Pratyush Yadav Signed-off-by: Will Deacon Signed-off-by: Sasha Levin --- arch/arm64/kernel/kexec_image.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kernel/kexec_image.c b/arch/arm64/kernel/kexec_image.c index 532d72ea42ee8..b70f4df15a1ae 100644 --- a/arch/arm64/kernel/kexec_image.c +++ b/arch/arm64/kernel/kexec_image.c @@ -41,7 +41,7 @@ static void *image_load(struct kimage *image, 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; -- 2.51.0