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 D37BB1D68D for ; Wed, 4 Oct 2023 18:14:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 005F5C433C7; Wed, 4 Oct 2023 18:14:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1696443278; bh=cBVKFjnUKC09UEBclA+WGL27oZHQDcKsnVPRsRU7Y78=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=E6gOxZG8soKoDzUmxr8P2tTRK4IuMvEF+dHYYRoIRB1aNsujebZ+LoZeKw/z5h2oP 4h87CQXAKj3pofXEAHvf56hj8/fUn5s5sP4ZBQl9GlYrUvC3oWTkBlsulL/EC3RSh7 Wzxo2SCjZD5rJje4YGBOSxsby1nJfrGhd9chUIac= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Mike Rappoport , Rik van Riel , Ingo Molnar , Sasha Levin Subject: [PATCH 6.1 061/259] x86/mm, kexec, ima: Use memblock_free_late() from ima_free_kexec_buffer() Date: Wed, 4 Oct 2023 19:53:54 +0200 Message-ID: <20231004175220.221224682@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231004175217.404851126@linuxfoundation.org> References: <20231004175217.404851126@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Rik van Riel [ Upstream commit 34cf99c250d5cd2530b93a57b0de31d3aaf8685b ] The code calling ima_free_kexec_buffer() runs long after the memblock allocator has already been torn down, potentially resulting in a use after free in memblock_isolate_range(). With KASAN or KFENCE, this use after free will result in a BUG from the idle task, and a subsequent kernel panic. Switch ima_free_kexec_buffer() over to memblock_free_late() to avoid that bug. Fixes: fee3ff99bc67 ("powerpc: Move arch independent ima kexec functions to drivers/of/kexec.c") Suggested-by: Mike Rappoport Signed-off-by: Rik van Riel Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20230817135558.67274c83@imladris.surriel.com Signed-off-by: Sasha Levin --- arch/x86/kernel/setup.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 892609cde4a20..804a252382da7 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -363,15 +363,11 @@ static void __init add_early_ima_buffer(u64 phys_addr) #if defined(CONFIG_HAVE_IMA_KEXEC) && !defined(CONFIG_OF_FLATTREE) int __init ima_free_kexec_buffer(void) { - int rc; - if (!ima_kexec_buffer_size) return -ENOENT; - rc = memblock_phys_free(ima_kexec_buffer_phys, - ima_kexec_buffer_size); - if (rc) - return rc; + memblock_free_late(ima_kexec_buffer_phys, + ima_kexec_buffer_size); ima_kexec_buffer_phys = 0; ima_kexec_buffer_size = 0; -- 2.40.1