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f2fs: fix to do sanity check for inline inode

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commit 677a82b44e 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>
This commit is contained in:
Chao Yu
2022-05-18 20:28:41 +08:00
committed by Greg Kroah-Hartman
parent 2221a2d410
commit efdefbe8b7
3 changed files with 26 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
fs/f2fs/f2fs.h
View File

@@ -3735,6 +3735,7 @@ extern struct kmem_cache *f2fs_inode_entry_slab;
* 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,

27
fs/f2fs/inline.c
View File

@@ -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;
}
if (f2fs_post_read_required(inode))
bool f2fs_may_inline_data(struct inode *inode)
{
if (!support_inline_data(inode))
return false;
return !f2fs_post_read_required(inode);
}
bool f2fs_sanity_check_inline_data(struct inode *inode)
{
if (!f2fs_has_inline_data(inode))
return false;
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)

3
fs/f2fs/inode.c
View File

@@ -272,8 +272,7 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page)
}
}
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);