linux-kernel - Re: [PATCH v2] ntfs: Fix ntfs_test_inode and ntfs_init_locked

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Message-ID: <YbIiVL404/Px0gXl@kroah.com>
Date:   Thu, 9 Dec 2021 16:35:48 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Mark-PK Tsai <mark-pk.tsai@...iatek.com>
Cc:     luca.stefani.ge1@...il.com, akpm@...ux-foundation.org,
        anton@...era.com, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, linux-ntfs-dev@...ts.sourceforge.net,
        michalechner92@...glemail.com, stable@...r.kernel.org,
        yj.chiang@...iatek.com
Subject: Re: [PATCH v2] ntfs: Fix ntfs_test_inode and ntfs_init_locked_inode
 function type

On Thu, Dec 09, 2021 at 10:38:39PM +0800, Mark-PK Tsai wrote:
> > Clang's Control Flow Integrity (CFI) is a security mechanism that can
> > help prevent JOP chains, deployed extensively in downstream kernels
> > used in Android.
> > 
> > It's 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@...il.com>
> > Tested-by: freak07 <michalechner92@...glemail.com>
> > Acked-by: Anton Altaparmakov <anton@...era.com>
> > ---
> >  fs/ntfs/dir.c   |  2 +-
> >  fs/ntfs/inode.c | 27 ++++++++++++++-------------
> >  fs/ntfs/inode.h |  4 +---
> >  fs/ntfs/mft.c   |  4 ++--
> >  4 files changed, 18 insertions(+), 19 deletions(-)
> > 
> 
> Hi,
> 
> I think stable tree should pick this change.
> 
> Below is the mainline commit.
> 
> (1146f7e2dc15 ntfs: fix ntfs_test_inode and ntfs_init_locked_inode function type)
> 
> 5.4 stable have the same issue when CFI is enabled.

Now queued up, thanks.

greg k-h