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Thu, 01 Dec 2022 22:38:22 +0800 (CST) From: Ye Bin To: tytso@mit.edu, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org Cc: linux-kernel@vger.kernel.org, jack@suse.cz, Ye Bin , syzbot+4d99a966fd74bdeeec36@syzkaller.appspotmail.com Subject: [PATCH v2] ext4: fix WARNING in ext4_expand_extra_isize_ea Date: Thu, 1 Dec 2022 22:59:23 +0800 Message-Id: <20221201145923.73028-1-yebin@huaweicloud.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: gCh0CgAnmdZcvIhjVMXmBQ--.22010S4 X-Coremail-Antispam: 1UD129KBjvJXoWxGrW3JFy5KrWkJr4rZr4kXrb_yoWrZF1Up3 yayry8Cr48WryUCF48Cr1UJ34DWwn3CF4UJrW7Wr4xZFy7Xw1xKFyDKF43ZFy8tFW8Jr9F qF4Dtw10gr15G3DanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUgEb4IE77IF4wAFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4 vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjxv20xvEc7Cj xVAFwI0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x 0267AKxVW0oVCq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG 6I80ewAv7VC0I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFV Cjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JMxAIw28IcxkI7VAKI48JMxC20s026xCaFVCj c4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4 CE17CEb7AF67AKxVWUAVWUtwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1j6r1x MIIF0xvE2Ix0cI8IcVCY1x0267AKxVWUJVW8JwCI42IY6xAIw20EY4v20xvaj40_WFyUJV Cq3wCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIY CTnIWIevJa73UjIFyTuYvjxUrR6zUUUUU X-CM-SenderInfo: p1hex046kxt4xhlfz01xgou0bp/ X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Ye Bin Syzbot found the following issue: Reported-by: syzbot+4d99a966fd74bdeeec36@syzkaller.appspotmail.com Reviewed-by: Jan Kara ------------[ cut here ]------------ WARNING: CPU: 1 PID: 3631 at mm/page_alloc.c:5534 __alloc_pages+0x30a/0x560= mm/page_alloc.c:5534 Modules linked in: CPU: 1 PID: 3631 Comm: syz-executor261 Not tainted 6.1.0-rc6-syzkaller-0030= 8-g644e9524388a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Goo= gle 10/26/2022 RIP: 0010:__alloc_pages+0x30a/0x560 mm/page_alloc.c:5534 RSP: 0018:ffffc90003ccf080 EFLAGS: 00010246 RAX: ffffc90003ccf0e0 RBX: 000000000000000c RCX: 0000000000000000 RDX: 0000000000000028 RSI: 0000000000000000 RDI: ffffc90003ccf108 RBP: ffffc90003ccf198 R08: dffffc0000000000 R09: ffffc90003ccf0e0 R10: fffff52000799e21 R11: 1ffff92000799e1c R12: 0000000000040c40 R13: 1ffff92000799e18 R14: dffffc0000000000 R15: 1ffff92000799e14 FS: 0000555555c10300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc36f70000 CR3: 00000000744ad000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __alloc_pages_node include/linux/gfp.h:223 [inline] alloc_pages_node include/linux/gfp.h:246 [inline] __kmalloc_large_node+0x8a/0x1a0 mm/slab_common.c:1096 __do_kmalloc_node mm/slab_common.c:943 [inline] __kmalloc+0xfe/0x1a0 mm/slab_common.c:968 kmalloc include/linux/slab.h:558 [inline] ext4_xattr_move_to_block fs/ext4/xattr.c:2558 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2673 [inline] ext4_expand_extra_isize_ea+0xe3f/0x1cd0 fs/ext4/xattr.c:2765 __ext4_expand_extra_isize+0x2b8/0x3f0 fs/ext4/inode.c:5857 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5900 [inline] __ext4_mark_inode_dirty+0x51a/0x670 fs/ext4/inode.c:5978 ext4_inline_data_truncate+0x548/0xd00 fs/ext4/inline.c:2021 ext4_truncate+0x341/0xeb0 fs/ext4/inode.c:4221 ext4_process_orphan+0x1aa/0x2d0 fs/ext4/orphan.c:339 ext4_orphan_cleanup+0xb60/0x1340 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5515 [inline] ext4_fill_super+0x80ed/0x8610 fs/ext4/super.c:5643 get_tree_bdev+0x400/0x620 fs/super.c:1324 vfs_get_tree+0x88/0x270 fs/super.c:1531 do_new_mount+0x289/0xad0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Reason is allocate 16M memory by kmalloc, but MAX_ORDER is 11, kmalloc can allocate maxium size memory is 4M. XATTR_SIZE_MAX is currently 64k, but EXT4_XATTR_SIZE_MAX is '(1 << 24)', so 'ext4_xattr_check_entries()' regards this length as legal. Then trigger warning in 'ext4_xattr_move_to_block()'. To solve above issue, according to Jan Kara's suggestion use kvmalloc() to allocate memory in ext4_xattr_move_to_block(). Reported-by: syzbot+4d99a966fd74bdeeec36@syzkaller.appspotmail.com Fixes: 54dd0e0a1b25 ("ext4: add extra checks to ext4_xattr_block_get()") Signed-off-by: Ye Bin --- fs/ext4/xattr.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index 718ef3987f94..23cfefc6d262 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -2556,7 +2556,7 @@ static int ext4_xattr_move_to_block(handle_t *handle,= struct inode *inode, =20 is =3D kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); bs =3D kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); - buffer =3D kmalloc(value_size, GFP_NOFS); + buffer =3D kvmalloc(value_size, GFP_NOFS); b_entry_name =3D kmalloc(entry->e_name_len + 1, GFP_NOFS); if (!is || !bs || !buffer || !b_entry_name) { error =3D -ENOMEM; @@ -2608,7 +2608,7 @@ static int ext4_xattr_move_to_block(handle_t *handle,= struct inode *inode, error =3D 0; out: kfree(b_entry_name); - kfree(buffer); + kvfree(buffer); if (is) brelse(is->iloc.bh); if (bs) --=20 2.31.1