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f2fs: remove write attribute of main_blkaddr sysfs node 

Fuzzing main_blkaddr sysfs node will corrupt this field's value,
causing kernel panic, remove its write attribute to avoid potential
security risk.

[Chao Yu: add description]

Signed-off-by: Dehe Gu <gudehe@huawei.com>
Signed-off-by: Daiyue Zhang <zhangdaiyue1@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Dehe Gu 2020-07-03 17:51:29 +08:00 committed by Jaegeuk Kim
parent 0e5e81114d
commit ffcde4b29a
1 changed files with 8 additions and 1 deletions
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9
fs/f2fs/sysfs.c
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@ -223,6 +223,13 @@ static ssize_t avg_vblocks_show(struct f2fs_attr *a,
}
#endif
static ssize_t main_blkaddr_show(struct f2fs_attr *a,
struct f2fs_sb_info *sbi, char *buf)
{
return snprintf(buf, PAGE_SIZE, "%llu\n",
(unsigned long long)MAIN_BLKADDR(sbi));
}
static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
struct f2fs_sb_info *sbi, char *buf)
{
@ -526,7 +533,6 @@ F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_idle, gc_mode);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_urgent, gc_mode);
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, main_blkaddr, main_blkaddr);
F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_small_discards, max_discards);
F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, discard_granularity, discard_granularity);
F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, reserved_blocks, reserved_blocks);
@ -569,6 +575,7 @@ F2FS_GENERAL_RO_ATTR(current_reserved_blocks);
F2FS_GENERAL_RO_ATTR(unusable);
F2FS_GENERAL_RO_ATTR(encoding);
F2FS_GENERAL_RO_ATTR(mounted_time_sec);
F2FS_GENERAL_RO_ATTR(main_blkaddr);
#ifdef CONFIG_F2FS_STAT_FS
F2FS_STAT_ATTR(STAT_INFO, f2fs_stat_info, cp_foreground_calls, cp_count);
F2FS_STAT_ATTR(STAT_INFO, f2fs_stat_info, cp_background_calls, bg_cp_count);