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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-08-04 18:34:55 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-08-04 18:34:55 -0700 |
| commit | 60f5a21736322c25b297b022aa48aeb28fd56f9e (patch) | |
| tree | aa9e89380ef0810ba25de912aa7253513c1cf635 | |
| parent | f639bef55d2bf4847d98f45087e1a5874e2320e8 (diff) | |
| parent | 961b33c244e5ba1543ae26270a1ba29f29c2db83 (diff) | |
| download | linux-60f5a21736322c25b297b022aa48aeb28fd56f9e.tar.gz | |
Merge tag 'usercopy-fix-v4.18-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull usercopy whitelisting fix from Kees Cook:
"Bart Massey discovered that the usercopy whitelist for JFS was
incomplete: the inline inode data may intentionally "overflow" into
the neighboring "extended area", so the size of the whitelist needed
to be raised to include the neighboring field"
* tag 'usercopy-fix-v4.18-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
jfs: Fix usercopy whitelist for inline inode data
| -rw-r--r-- | fs/jfs/jfs_dinode.h | 7 | ||||
| -rw-r--r-- | fs/jfs/jfs_incore.h | 1 | ||||
| -rw-r--r-- | fs/jfs/super.c | 3 |
3 files changed, 9 insertions, 2 deletions
diff --git a/fs/jfs/jfs_dinode.h b/fs/jfs/jfs_dinode.h index 395c4c0d0f0667..1682a87c00b259 100644 --- a/fs/jfs/jfs_dinode.h +++ b/fs/jfs/jfs_dinode.h @@ -115,6 +115,13 @@ struct dinode { dxd_t _dxd; /* 16: */ union { __le32 _rdev; /* 4: */ + /* + * The fast symlink area + * is expected to overflow + * into _inlineea when + * needed (which will clear + * INLINEEA). + */ u8 _fastsymlink[128]; } _u; u8 _inlineea[128]; diff --git a/fs/jfs/jfs_incore.h b/fs/jfs/jfs_incore.h index 1f26d1910409af..9940a1e04cbfb7 100644 --- a/fs/jfs/jfs_incore.h +++ b/fs/jfs/jfs_incore.h @@ -87,6 +87,7 @@ struct jfs_inode_info { struct { unchar _unused[16]; /* 16: */ dxd_t _dxd; /* 16: */ + /* _inline may overflow into _inline_ea when needed */ unchar _inline[128]; /* 128: inline symlink */ /* _inline_ea may overlay the last part of * file._xtroot if maxentry = XTROOTINITSLOT diff --git a/fs/jfs/super.c b/fs/jfs/super.c index 1b9264fd54b686..f08571433aba2b 100644 --- a/fs/jfs/super.c +++ b/fs/jfs/super.c @@ -967,8 +967,7 @@ static int __init init_jfs_fs(void) jfs_inode_cachep = kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info), 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT, - offsetof(struct jfs_inode_info, i_inline), - sizeof_field(struct jfs_inode_info, i_inline), + offsetof(struct jfs_inode_info, i_inline), IDATASIZE, init_once); if (jfs_inode_cachep == NULL) return -ENOMEM; |