From: Baokun Li libaokun1@huawei.com

stable inclusion from stable-v5.10.210 commit e7b9fa6c298fbe6d329ffdf0c98b91938e046946 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9BV4P CVE: CVE-2023-52622

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit b099eb87de105cf07cad731ded6fb40b2675108b ]

In commit 967ac8af4475 ("ext4: fix potential integer overflow in alloc_flex_gd()"), an overflow check is added to alloc_flex_gd() to prevent the allocated memory from being smaller than expected due to the overflow. However, after kmalloc() is replaced with kmalloc_array() in commit 6da2ec56059c ("treewide: kmalloc() -> kmalloc_array()"), the kmalloc_array() function has an overflow check, so the above problem will not occur. Therefore, the extra check is removed.

Signed-off-by: Baokun Li libaokun1@huawei.com Reviewed-by: Jan Kara jack@suse.cz Link: https://lore.kernel.org/r/20231023013057.2117948-3-libaokun1@huawei.com Signed-off-by: Theodore Ts'o tytso@mit.edu Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Lin Yujun linyujun809@huawei.com Signed-off-by: Yifan Qiao qiaoyifan4@huawei.com --- fs/ext4/resize.c | 3 --- 1 file changed, 3 deletions(-)

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index b8e9ea475a59..cb6bc917fc98 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -245,10 +245,7 @@ static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) if (flex_gd == NULL) goto out3;

- if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data)) - goto out2; flex_gd->count = flexbg_size; - flex_gd->groups = kmalloc_array(flexbg_size, sizeof(struct ext4_new_group_data), GFP_NOFS);

From: Baokun Li libaokun1@huawei.com

stable inclusion from stable-v5.10.210 commit cfbbb3199e71b63fc26cee0ebff327c47128a1e8 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9BV4P CVE: CVE-2023-52622

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit 5d1935ac02ca5aee364a449a35e2977ea84509b0 ]

When we online resize an ext4 filesystem with a oversized flexbg_size,

mkfs.ext4 -F -G 67108864 $dev -b 4096 100M mount $dev $dir resize2fs $dev 16G

the following WARN_ON is triggered: ================================================================== WARNING: CPU: 0 PID: 427 at mm/page_alloc.c:4402 __alloc_pages+0x411/0x550 Modules linked in: sg(E) CPU: 0 PID: 427 Comm: resize2fs Tainted: G E 6.6.0-rc5+ #314 RIP: 0010:__alloc_pages+0x411/0x550 Call Trace: <TASK> __kmalloc_large_node+0xa2/0x200 __kmalloc+0x16e/0x290 ext4_resize_fs+0x481/0xd80 __ext4_ioctl+0x1616/0x1d90 ext4_ioctl+0x12/0x20 __x64_sys_ioctl+0xf0/0x150 do_syscall_64+0x3b/0x90 ==================================================================

This is because flexbg_size is too large and the size of the new_group_data array to be allocated exceeds MAX_ORDER. Currently, the minimum value of MAX_ORDER is 8, the minimum value of PAGE_SIZE is 4096, the corresponding maximum number of groups that can be allocated is:

(PAGE_SIZE << MAX_ORDER) / sizeof(struct ext4_new_group_data) ≈ 21845

And the value that is down-aligned to the power of 2 is 16384. Therefore, this value is defined as MAX_RESIZE_BG, and the number of groups added each time does not exceed this value during resizing, and is added multiple times to complete the online resizing. The difference is that the metadata in a flex_bg may be more dispersed.

Signed-off-by: Baokun Li libaokun1@huawei.com Reviewed-by: Jan Kara jack@suse.cz Link: https://lore.kernel.org/r/20231023013057.2117948-4-libaokun1@huawei.com Signed-off-by: Theodore Ts'o tytso@mit.edu Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Lin Yujun linyujun809@huawei.com Signed-off-by: Yifan Qiao qiaoyifan4@huawei.com --- fs/ext4/resize.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index 74aa3cb0da4f..767cbebf04ee 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -227,10 +227,17 @@ struct ext4_new_flex_group_data { in the flex group */ __u16 *bg_flags; /* block group flags of groups in @groups */ + ext4_group_t resize_bg; /* number of allocated + new_group_data */ ext4_group_t count; /* number of groups in @groups */ };

+/* + * Avoiding memory allocation failures due to too many groups added each time. + */ +#define MAX_RESIZE_BG 16384 + /* * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of * @flexbg_size. @@ -245,14 +252,18 @@ static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned int flexbg_size) if (flex_gd == NULL) goto out3;

- flex_gd->count = flexbg_size; - flex_gd->groups = kmalloc_array(flexbg_size, + if (unlikely(flexbg_size > MAX_RESIZE_BG)) + flex_gd->resize_bg = MAX_RESIZE_BG; + else + flex_gd->resize_bg = flexbg_size; + + flex_gd->groups = kmalloc_array(flex_gd->resize_bg, sizeof(struct ext4_new_group_data), GFP_NOFS); if (flex_gd->groups == NULL) goto out2;

- flex_gd->bg_flags = kmalloc_array(flexbg_size, sizeof(__u16), + flex_gd->bg_flags = kmalloc_array(flex_gd->resize_bg, sizeof(__u16), GFP_NOFS); if (flex_gd->bg_flags == NULL) goto out1; @@ -1570,8 +1581,7 @@ static int ext4_flex_group_add(struct super_block *sb,

static int ext4_setup_next_flex_gd(struct super_block *sb, struct ext4_new_flex_group_data *flex_gd, - ext4_fsblk_t n_blocks_count, - unsigned int flexbg_size) + ext4_fsblk_t n_blocks_count) { struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_super_block *es = sbi->s_es; @@ -1595,7 +1605,7 @@ static int ext4_setup_next_flex_gd(struct super_block *sb, BUG_ON(last); ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last);

- last_group = group | (flexbg_size - 1); + last_group = group | (flex_gd->resize_bg - 1); if (last_group > n_group) last_group = n_group;

@@ -2102,8 +2112,7 @@ int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) /* Add flex groups. Note that a regular group is a * flex group with 1 group. */ - while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count, - flexbg_size)) { + while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count)) { if (jiffies - last_update_time > HZ * 10) { if (last_update_time) ext4_msg(sb, KERN_INFO,