From: Chao Yu chao@kernel.org
commit 677a82b44ebf263d4f9a0cfbd576a6ade797a07b upstream.
Yanming reported a kernel bug in Bugzilla kernel [1], which can be reproduced. The bug message is:
The kernel message is shown below:
kernel BUG at fs/inode.c:611! Call Trace: evict+0x282/0x4e0 __dentry_kill+0x2b2/0x4d0 dput+0x2dd/0x720 do_renameat2+0x596/0x970 __x64_sys_rename+0x78/0x90 do_syscall_64+0x3b/0x90
[1] https://bugzilla.kernel.org/show_bug.cgi?id=215895
The bug is due to fuzzed inode has both inline_data and encrypted flags. During f2fs_evict_inode(), as the inode was deleted by rename(), it will cause inline data conversion due to conflicting flags. The page cache will be polluted and the panic will be triggered in clear_inode().
Try fixing the bug by doing more sanity checks for inline data inode in sanity_check_inode().
Cc: stable@vger.kernel.org Reported-by: Ming Yan yanming@tju.edu.cn Signed-off-by: Chao Yu chao.yu@oppo.com Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/f2fs/f2fs.h | 1 + fs/f2fs/inline.c | 29 ++++++++++++++++++++++++----- fs/f2fs/inode.c | 3 +-- 3 files changed, 26 insertions(+), 7 deletions(-)
--- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -3916,6 +3916,7 @@ extern struct kmem_cache *f2fs_inode_ent * inline.c */ bool f2fs_may_inline_data(struct inode *inode); +bool f2fs_sanity_check_inline_data(struct inode *inode); bool f2fs_may_inline_dentry(struct inode *inode); void f2fs_do_read_inline_data(struct page *page, struct page *ipage); void f2fs_truncate_inline_inode(struct inode *inode, --- a/fs/f2fs/inline.c +++ b/fs/f2fs/inline.c @@ -14,21 +14,40 @@ #include "node.h" #include <trace/events/f2fs.h>
-bool f2fs_may_inline_data(struct inode *inode) +static bool support_inline_data(struct inode *inode) { if (f2fs_is_atomic_file(inode)) return false; - if (!S_ISREG(inode->i_mode) && !S_ISLNK(inode->i_mode)) return false; - if (i_size_read(inode) > MAX_INLINE_DATA(inode)) return false; + return true; +} + +bool f2fs_may_inline_data(struct inode *inode) +{ + if (!support_inline_data(inode)) + return false; + + return !f2fs_post_read_required(inode); +}
- if (f2fs_post_read_required(inode)) +bool f2fs_sanity_check_inline_data(struct inode *inode) +{ + if (!f2fs_has_inline_data(inode)) return false;
- return true; + if (!support_inline_data(inode)) + return true; + + /* + * used by sanity_check_inode(), when disk layout fields has not + * been synchronized to inmem fields. + */ + return (S_ISREG(inode->i_mode) && + (file_is_encrypt(inode) || file_is_verity(inode) || + (F2FS_I(inode)->i_flags & F2FS_COMPR_FL))); }
bool f2fs_may_inline_dentry(struct inode *inode) --- a/fs/f2fs/inode.c +++ b/fs/f2fs/inode.c @@ -276,8 +276,7 @@ static bool sanity_check_inode(struct in } }
- if (f2fs_has_inline_data(inode) && - (!S_ISREG(inode->i_mode) && !S_ISLNK(inode->i_mode))) { + if (f2fs_sanity_check_inline_data(inode)) { set_sbi_flag(sbi, SBI_NEED_FSCK); f2fs_warn(sbi, "%s: inode (ino=%lx, mode=%u) should not have inline_data, run fsck to fix", __func__, inode->i_ino, inode->i_mode);