• Randall Huang's avatar
    f2fs: fix to avoid accessing xattr across the boundary · 980628e3
    Randall Huang authored
    [ Upstream commit 2777e654 ]
    
    When we traverse xattr entries via __find_xattr(),
    if the raw filesystem content is faked or any hardware failure occurs,
    out-of-bound error can be detected by KASAN.
    Fix the issue by introducing boundary check.
    
    [   38.402878] c7   1827 BUG: KASAN: slab-out-of-bounds in f2fs_getxattr+0x518/0x68c
    [   38.402891] c7   1827 Read of size 4 at addr ffffffc0b6fb35dc by task
    [   38.402935] c7   1827 Call trace:
    [   38.402952] c7   1827 [<ffffff900809003c>] dump_backtrace+0x0/0x6bc
    [   38.402966] c7   1827 [<ffffff9008090030>] show_stack+0x20/0x2c
    [   38.402981] c7   1827 [<ffffff900871ab10>] dump_stack+0xfc/0x140
    [   38.402995] c7   1827 [<ffffff9008325c40>] print_address_description+0x80/0x2d8
    [   38.403009] c7   1827 [<ffffff900832629c>] kasan_report_error+0x198/0x1fc
    [   38.403022] c7   1827 [<ffffff9008326104>] kasan_report_error+0x0/0x1fc
    [   38.403037] c7   1827 [<ffffff9008325000>] __asan_load4+0x1b0/0x1b8
    [   38.403051] c7   1827 [<ffffff90085fcc44>] f2fs_getxattr+0x518/0x68c
    [   38.403066] c7   1827 [<ffffff90085fc508>] f2fs_xattr_generic_get+0xb0/0xd0
    [   38.403080] c7   1827 [<ffffff9008395708>] __vfs_getxattr+0x1f4/0x1fc
    [   38.403096] c7   1827 [<ffffff9008621bd0>] inode_doinit_with_dentry+0x360/0x938
    [   38.403109] c7   1827 [<ffffff900862d6cc>] selinux_d_instantiate+0x2c/0x38
    [   38.403123] c7   1827 [<ffffff900861b018>] security_d_instantiate+0x68/0x98
    [   38.403136] c7   1827 [<ffffff9008377db8>] d_splice_alias+0x58/0x348
    [   38.403149] c7   1827 [<ffffff900858d16c>] f2fs_lookup+0x608/0x774
    [   38.403163] c7   1827 [<ffffff900835eacc>] lookup_slow+0x1e0/0x2cc
    [   38.403177] c7   1827 [<ffffff9008367fe0>] walk_component+0x160/0x520
    [   38.403190] c7   1827 [<ffffff9008369ef4>] path_lookupat+0x110/0x2b4
    [   38.403203] c7   1827 [<ffffff900835dd38>] filename_lookup+0x1d8/0x3a8
    [   38.403216] c7   1827 [<ffffff900835eeb0>] user_path_at_empty+0x54/0x68
    [   38.403229] c7   1827 [<ffffff9008395f44>] SyS_getxattr+0xb4/0x18c
    [   38.403241] c7   1827 [<ffffff9008084200>] el0_svc_naked+0x34/0x38
    Signed-off-by: default avatarRandall Huang <huangrandall@google.com>
    [Jaegeuk Kim: Fix wrong ending boundary]
    Reviewed-by: default avatarChao Yu <yuchao0@huawei.com>
    Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
    Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
    980628e3
xattr.c 18.1 KB