diff options
author | Chao Yu <chao2.yu@samsung.com> | 2015-12-15 09:58:18 +0800 |
---|---|---|
committer | Sasha Levin <alexander.levin@verizon.com> | 2017-06-13 09:29:18 -0400 |
commit | c5ef0e9f70d182cda057417b98cb8f88cf1dea42 (patch) | |
tree | 7d08e35b39ea8498a63ef2fa402bd6cddbc4f1ba /fs | |
parent | 5f1cef9e823aa35c881745446ea3c865da338e4e (diff) |
f2fs: do more integrity verification for superblock
[ Upstream commit 9a59b62fd88196844cee5fff851bee2cfd7afb6e ]
Do more sanity check for superblock during ->mount.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/f2fs/super.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index b2dd1b01f076..37f61388a64d 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -819,6 +819,79 @@ static loff_t max_file_size(unsigned bits) return result; } +static inline bool sanity_check_area_boundary(struct super_block *sb, + struct f2fs_super_block *raw_super) +{ + u32 segment0_blkaddr = le32_to_cpu(raw_super->segment0_blkaddr); + u32 cp_blkaddr = le32_to_cpu(raw_super->cp_blkaddr); + u32 sit_blkaddr = le32_to_cpu(raw_super->sit_blkaddr); + u32 nat_blkaddr = le32_to_cpu(raw_super->nat_blkaddr); + u32 ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr); + u32 main_blkaddr = le32_to_cpu(raw_super->main_blkaddr); + u32 segment_count_ckpt = le32_to_cpu(raw_super->segment_count_ckpt); + u32 segment_count_sit = le32_to_cpu(raw_super->segment_count_sit); + u32 segment_count_nat = le32_to_cpu(raw_super->segment_count_nat); + u32 segment_count_ssa = le32_to_cpu(raw_super->segment_count_ssa); + u32 segment_count_main = le32_to_cpu(raw_super->segment_count_main); + u32 segment_count = le32_to_cpu(raw_super->segment_count); + u32 log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg); + + if (segment0_blkaddr != cp_blkaddr) { + f2fs_msg(sb, KERN_INFO, + "Mismatch start address, segment0(%u) cp_blkaddr(%u)", + segment0_blkaddr, cp_blkaddr); + return true; + } + + if (cp_blkaddr + (segment_count_ckpt << log_blocks_per_seg) != + sit_blkaddr) { + f2fs_msg(sb, KERN_INFO, + "Wrong CP boundary, start(%u) end(%u) blocks(%u)", + cp_blkaddr, sit_blkaddr, + segment_count_ckpt << log_blocks_per_seg); + return true; + } + + if (sit_blkaddr + (segment_count_sit << log_blocks_per_seg) != + nat_blkaddr) { + f2fs_msg(sb, KERN_INFO, + "Wrong SIT boundary, start(%u) end(%u) blocks(%u)", + sit_blkaddr, nat_blkaddr, + segment_count_sit << log_blocks_per_seg); + return true; + } + + if (nat_blkaddr + (segment_count_nat << log_blocks_per_seg) != + ssa_blkaddr) { + f2fs_msg(sb, KERN_INFO, + "Wrong NAT boundary, start(%u) end(%u) blocks(%u)", + nat_blkaddr, ssa_blkaddr, + segment_count_nat << log_blocks_per_seg); + return true; + } + + if (ssa_blkaddr + (segment_count_ssa << log_blocks_per_seg) != + main_blkaddr) { + f2fs_msg(sb, KERN_INFO, + "Wrong SSA boundary, start(%u) end(%u) blocks(%u)", + ssa_blkaddr, main_blkaddr, + segment_count_ssa << log_blocks_per_seg); + return true; + } + + if (main_blkaddr + (segment_count_main << log_blocks_per_seg) != + segment0_blkaddr + (segment_count << log_blocks_per_seg)) { + f2fs_msg(sb, KERN_INFO, + "Wrong MAIN_AREA boundary, start(%u) end(%u) blocks(%u)", + main_blkaddr, + segment0_blkaddr + (segment_count << log_blocks_per_seg), + segment_count_main << log_blocks_per_seg); + return true; + } + + return false; +} + static int sanity_check_raw_super(struct super_block *sb, struct f2fs_super_block *raw_super) { @@ -848,6 +921,14 @@ static int sanity_check_raw_super(struct super_block *sb, return 1; } + /* check log blocks per segment */ + if (le32_to_cpu(raw_super->log_blocks_per_seg) != 9) { + f2fs_msg(sb, KERN_INFO, + "Invalid log blocks per segment (%u)\n", + le32_to_cpu(raw_super->log_blocks_per_seg)); + return 1; + } + /* Currently, support 512/1024/2048/4096 bytes sector size */ if (le32_to_cpu(raw_super->log_sectorsize) > F2FS_MAX_LOG_SECTOR_SIZE || @@ -866,6 +947,23 @@ static int sanity_check_raw_super(struct super_block *sb, le32_to_cpu(raw_super->log_sectorsize)); return 1; } + + /* check reserved ino info */ + if (le32_to_cpu(raw_super->node_ino) != 1 || + le32_to_cpu(raw_super->meta_ino) != 2 || + le32_to_cpu(raw_super->root_ino) != 3) { + f2fs_msg(sb, KERN_INFO, + "Invalid Fs Meta Ino: node(%u) meta(%u) root(%u)", + le32_to_cpu(raw_super->node_ino), + le32_to_cpu(raw_super->meta_ino), + le32_to_cpu(raw_super->root_ino)); + return 1; + } + + /* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */ + if (sanity_check_area_boundary(sb, raw_super)) + return 1; + return 0; } |