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ntfs: fix ntfs_test_inode and ntfs_init_locked_inode function type

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Clang's Control Flow Integrity (CFI) is a security mechanism that can help
prevent JOP chains, deployed extensively in downstream kernels used in
Android.

Its deployment is hindered by mismatches in function signatures.  For this
case, we make callbacks match their intended function signature, and cast
parameters within them rather than casting the callback when passed as a
parameter.

When running `mount -t ntfs ...` we observe the following trace:

Call trace:
__cfi_check_fail+0x1c/0x24
name_to_dev_t+0x0/0x404
iget5_locked+0x594/0x5e8
ntfs_fill_super+0xbfc/0x43ec
mount_bdev+0x30c/0x3cc
ntfs_mount+0x18/0x24
mount_fs+0x1b0/0x380
vfs_kern_mount+0x90/0x398
do_mount+0x5d8/0x1a10
SyS_mount+0x108/0x144
el0_svc_naked+0x34/0x38

Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: freak07 <michalechner92@googlemail.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Acked-by: Anton Altaparmakov <anton@tuxera.com>
Link: http://lkml.kernel.org/r/20200718112513.533800-1-luca.stefani.ge1@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Luca Stefani
2020-08-06 23:17:53 -07:00
committed by Linus Torvalds
parent 70a175e507
commit 1146f7e2dc
4 changed files with 18 additions and 19 deletions
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4
fs/ntfs/mft.c
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@@ -958,7 +958,7 @@ bool ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
* dirty code path of the inode dirty code path when writing
* $MFT occurs.
*/
vi = ilookup5_nowait(sb, mft_no, (test_t)ntfs_test_inode, &na);
vi = ilookup5_nowait(sb, mft_no, ntfs_test_inode, &na);
}
if (vi) {
ntfs_debug("Base inode 0x%lx is in icache.", mft_no);
@@ -1019,7 +1019,7 @@ bool ntfs_may_write_mft_record(ntfs_volume *vol, const unsigned long mft_no,
vi = igrab(mft_vi);
BUG_ON(vi != mft_vi);
} else
vi = ilookup5_nowait(sb, na.mft_no, (test_t)ntfs_test_inode,
vi = ilookup5_nowait(sb, na.mft_no, ntfs_test_inode,
&na);
if (!vi) {
/*