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 65B39277CBA; Wed, 30 Jul 2025 09:47:43 +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=1753868863; cv=none; b=p7lWNqdEVtXKr9pBUhDjLYA08x817aNp3teRcQkZnhDjQlTvBGNrNBekKKXNmahBvAGQHA9am03+bB41k+15Nezusbfo8lYHdml0LNdoRQldI+19YaeJlvesHmIzqLaD3aHFHD18Ast/U5PzyXKOZzTDyuEO4db2KDLpNK63X3s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753868863; c=relaxed/simple; bh=ojoqNfQlxoqSvfzFvuH8mnf2rPnaEK090CEjHHO5jN4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uCUlEAISpdjNvvJUycLUu+fkGZyJcxS3lNWMFj/Sd9oYriGOqynmwKzYde0n6NWCEd7/BIG3Q4XGUIxNEMEU1IznJg85Hq8e9p0sBlnksE8NBItb9MXl3G7qS33WFqTdeb/1qxrjmJM09CBnria1eJU+AmKC3uPKbOxgxyHh1gw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Z5TVH3pH; 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="Z5TVH3pH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CE08EC4CEF5; Wed, 30 Jul 2025 09:47:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1753868863; bh=ojoqNfQlxoqSvfzFvuH8mnf2rPnaEK090CEjHHO5jN4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Z5TVH3pH0TghudOnPM9GLePo3+AaWUt9ZFV6gmYjfOMgO37AK1ro2vvUvit4EgKyL DHBGKgVBpD2LtYitcf7V98GBKCFx6apVJn5wCkDDulaS1ieYTXC/E9gZxDOB+Q9nIY 9Ad8bvXIYlC3ZZPsB+VOOJNf1AwiofQckXgyOjaM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Liebes Wang , Zhang Yi , Jan Kara , Baokun Li , Theodore Tso , stable@kernel.org, Sasha Levin Subject: [PATCH 6.12 095/117] ext4: fix out of bounds punch offset Date: Wed, 30 Jul 2025 11:36:04 +0200 Message-ID: <20250730093237.488116366@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250730093233.592541778@linuxfoundation.org> References: <20250730093233.592541778@linuxfoundation.org> User-Agent: quilt/0.68 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-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhang Yi [ Upstream commit b5e58bcd79625423487fa3ecba8e8411b5396327 ] Punching a hole with a start offset that exceeds max_end is not permitted and will result in a negative length in the truncate_inode_partial_folio() function while truncating the page cache, potentially leading to undesirable consequences. A simple reproducer: truncate -s 9895604649994 /mnt/foo xfs_io -c "pwrite 8796093022208 4096" /mnt/foo xfs_io -c "fpunch 8796093022213 25769803777" /mnt/foo kernel BUG at include/linux/highmem.h:275! Oops: invalid opcode: 0000 [#1] SMP PTI CPU: 3 UID: 0 PID: 710 Comm: xfs_io Not tainted 6.15.0-rc3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40 04/01/2014 RIP: 0010:zero_user_segments.constprop.0+0xd7/0x110 RSP: 0018:ffffc90001cf3b38 EFLAGS: 00010287 RAX: 0000000000000005 RBX: ffffea0001485e40 RCX: 0000000000001000 RDX: 000000000040b000 RSI: 0000000000000005 RDI: 000000000040b000 RBP: 000000000040affb R08: ffff888000000000 R09: ffffea0000000000 R10: 0000000000000003 R11: 00000000fffc7fc5 R12: 0000000000000005 R13: 000000000040affb R14: ffffea0001485e40 R15: ffff888031cd3000 FS: 00007f4f63d0b780(0000) GS:ffff8880d337d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000001ae0b038 CR3: 00000000536aa000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: truncate_inode_partial_folio+0x3dd/0x620 truncate_inode_pages_range+0x226/0x720 ? bdev_getblk+0x52/0x3e0 ? ext4_get_group_desc+0x78/0x150 ? crc32c_arch+0xfd/0x180 ? __ext4_get_inode_loc+0x18c/0x840 ? ext4_inode_csum+0x117/0x160 ? jbd2_journal_dirty_metadata+0x61/0x390 ? __ext4_handle_dirty_metadata+0xa0/0x2b0 ? kmem_cache_free+0x90/0x5a0 ? jbd2_journal_stop+0x1d5/0x550 ? __ext4_journal_stop+0x49/0x100 truncate_pagecache_range+0x50/0x80 ext4_truncate_page_cache_block_range+0x57/0x3a0 ext4_punch_hole+0x1fe/0x670 ext4_fallocate+0x792/0x17d0 ? __count_memcg_events+0x175/0x2a0 vfs_fallocate+0x121/0x560 ksys_fallocate+0x51/0xc0 __x64_sys_fallocate+0x24/0x40 x64_sys_call+0x18d2/0x4170 do_syscall_64+0xa7/0x220 entry_SYSCALL_64_after_hwframe+0x76/0x7e Fix this by filtering out cases where the punching start offset exceeds max_end. Fixes: 982bf37da09d ("ext4: refactor ext4_punch_hole()") Reported-by: Liebes Wang Closes: https://lore.kernel.org/linux-ext4/ac3a58f6-e686-488b-a9ee-fc041024e43d@huawei.com/ Tested-by: Liebes Wang Signed-off-by: Zhang Yi Reviewed-by: Jan Kara Reviewed-by: Baokun Li Link: https://patch.msgid.link/20250506012009.3896990-1-yi.zhang@huaweicloud.com Signed-off-by: Theodore Ts'o Cc: stable@kernel.org Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- fs/ext4/inode.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4009,7 +4009,7 @@ int ext4_punch_hole(struct file *file, l max_end = EXT4_SB(sb)->s_bitmap_maxbytes - sb->s_blocksize; /* No need to punch hole beyond i_size */ - if (offset >= inode->i_size) + if (offset >= inode->i_size || offset >= max_end) return 0; /*