Messages in this thread Patch in this message | | | Date | Thu, 8 Sep 2022 10:11:41 +0800 | Subject | Re: [PATCH v2] f2fs: fix to disallow getting inner inode via f2fs_iget() | From | Chao Yu <> |
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On 2022/9/8 10:02, Jaegeuk Kim wrote: > On 08/31, Chao Yu wrote: >> From: Chao Yu <chao.yu@oppo.com> >> >> Introduce f2fs_iget_inner() for f2fs_fill_super() to get inner inode: >> meta inode, node inode or compressed inode, and add f2fs_check_nid_range() >> in f2fs_iget() to avoid getting inner inode from external interfaces. > > So, we don't want to check the range of inner inode numbers? What'd be the > way to check it's okay?
For node_ino, meta_ino, root_ino, we have checked them in sanity_check_raw_super() as below:
/* 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_info(sbi, "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 -EFSCORRUPTED; }
compressed_ino should always be NM_I(sbi)->max_nid, it can be checked in f2fs_init_compress_inode()?
Thanks,
> >> >> Signed-off-by: Chao Yu <chao.yu@oppo.com> >> --- >> v2: >> - don't override errno from f2fs_check_nid_range() >> - fix compile error >> fs/f2fs/compress.c | 2 +- >> fs/f2fs/f2fs.h | 1 + >> fs/f2fs/inode.c | 13 ++++++++++++- >> fs/f2fs/super.c | 4 ++-- >> 4 files changed, 16 insertions(+), 4 deletions(-) >> >> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c >> index 730256732a9e..c38b22bb6432 100644 >> --- a/fs/f2fs/compress.c >> +++ b/fs/f2fs/compress.c >> @@ -1947,7 +1947,7 @@ int f2fs_init_compress_inode(struct f2fs_sb_info *sbi) >> if (!test_opt(sbi, COMPRESS_CACHE)) >> return 0; >> >> - inode = f2fs_iget(sbi->sb, F2FS_COMPRESS_INO(sbi)); >> + inode = f2fs_iget_inner(sbi->sb, F2FS_COMPRESS_INO(sbi)); >> if (IS_ERR(inode)) >> return PTR_ERR(inode); >> sbi->compress_inode = inode; >> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h >> index 408d8034ed74..35f9e1a6a1bf 100644 >> --- a/fs/f2fs/f2fs.h >> +++ b/fs/f2fs/f2fs.h >> @@ -3467,6 +3467,7 @@ int f2fs_pin_file_control(struct inode *inode, bool inc); >> void f2fs_set_inode_flags(struct inode *inode); >> bool f2fs_inode_chksum_verify(struct f2fs_sb_info *sbi, struct page *page); >> void f2fs_inode_chksum_set(struct f2fs_sb_info *sbi, struct page *page); >> +struct inode *f2fs_iget_inner(struct super_block *sb, unsigned long ino); >> struct inode *f2fs_iget(struct super_block *sb, unsigned long ino); >> struct inode *f2fs_iget_retry(struct super_block *sb, unsigned long ino); >> int f2fs_try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink); >> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c >> index 6d11c365d7b4..965f87c1dd63 100644 >> --- a/fs/f2fs/inode.c >> +++ b/fs/f2fs/inode.c >> @@ -480,7 +480,7 @@ static int do_read_inode(struct inode *inode) >> return 0; >> } >> >> -struct inode *f2fs_iget(struct super_block *sb, unsigned long ino) >> +struct inode *f2fs_iget_inner(struct super_block *sb, unsigned long ino) >> { >> struct f2fs_sb_info *sbi = F2FS_SB(sb); >> struct inode *inode; >> @@ -568,6 +568,17 @@ struct inode *f2fs_iget(struct super_block *sb, unsigned long ino) >> return ERR_PTR(ret); >> } >> >> +struct inode *f2fs_iget(struct super_block *sb, unsigned long ino) >> +{ >> + int ret; >> + >> + ret = f2fs_check_nid_range(F2FS_SB(sb), ino); >> + if (ret) >> + return ERR_PTR(ret); >> + >> + return f2fs_iget_inner(sb, ino); >> +} >> + >> struct inode *f2fs_iget_retry(struct super_block *sb, unsigned long ino) >> { >> struct inode *inode; >> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c >> index b8e5fe244596..a5f5e7483791 100644 >> --- a/fs/f2fs/super.c >> +++ b/fs/f2fs/super.c >> @@ -4157,7 +4157,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent) >> goto free_xattr_cache; >> >> /* get an inode for meta space */ >> - sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi)); >> + sbi->meta_inode = f2fs_iget_inner(sb, F2FS_META_INO(sbi)); >> if (IS_ERR(sbi->meta_inode)) { >> f2fs_err(sbi, "Failed to read F2FS meta data inode"); >> err = PTR_ERR(sbi->meta_inode); >> @@ -4265,7 +4265,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent) >> goto free_nm; >> >> /* get an inode for node space */ >> - sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi)); >> + sbi->node_inode = f2fs_iget_inner(sb, F2FS_NODE_INO(sbi)); >> if (IS_ERR(sbi->node_inode)) { >> f2fs_err(sbi, "Failed to read node inode"); >> err = PTR_ERR(sbi->node_inode); >> -- >> 2.25.1
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