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Message-ID: <tencent_B6953CE9AEEEFACC2C788A6D302F656DD80A@qq.com>
Date: Tue, 19 Dec 2023 17:46:31 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+33f23b49ac24f986c9e8@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [btrfs?] KASAN: slab-out-of-bounds Read in getname_kernel (2)
please test slab-out-of-bounds Read in getname_kernel
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 3bd7d7488169
diff --git a/mm/util.c b/mm/util.c
index 744b4d7e3fae..2581d687df87 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -194,7 +194,7 @@ void *memdup_user(const void __user *src, size_t len)
{
void *p;
- p = kmalloc_track_caller(len, GFP_USER | __GFP_NOWARN);
+ p = kmalloc_track_caller(len, GFP_USER | __GFP_NOWARN | __GFP_ZERO);
if (!p)
return ERR_PTR(-ENOMEM);
diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index f9544fda38e9..8318f6a21b3d 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -730,7 +730,7 @@ static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info,
int btrfs_dev_replace_by_ioctl(struct btrfs_fs_info *fs_info,
struct btrfs_ioctl_dev_replace_args *args)
{
- int ret;
+ int ret, len;
switch (args->start.cont_reading_from_srcdev_mode) {
case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS:
@@ -740,8 +740,11 @@ int btrfs_dev_replace_by_ioctl(struct btrfs_fs_info *fs_info,
return -EINVAL;
}
+ len = strnlen(args->start.tgtdev_name, BTRFS_DEVICE_PATH_NAME_MAX + 1);
+ printk("l: %d, %s\n", len, __func__);
if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') ||
- args->start.tgtdev_name[0] == '\0')
+ args->start.tgtdev_name[0] == '\0' ||
+ len == BTRFS_DEVICE_PATH_NAME_MAX + 1)
return -EINVAL;
ret = btrfs_dev_replace_start(fs_info, args->start.tgtdev_name,
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