linux-kernel - Re: [PATCH] debugfs: add fsd's methods initialization

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Message-ID: <2025020354-diabolic-freezable-095d@gregkh>
Date: Mon, 3 Feb 2025 12:27:04 +0100
From: Greg KH <gregkh@...uxfoundation.org>
To: Edward Adam Davis <eadavis@...com>
Cc: dakr@...nel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, rafael@...nel.org,
	syzbot+8928e473a91452caca2f@...kaller.appspotmail.com,
	syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] debugfs: add fsd's methods initialization

On Mon, Feb 03, 2025 at 07:05:32PM +0800, Edward Adam Davis wrote:
> On Mon, 3 Feb 2025 09:14:51 +0100, Greg KH wrote:
> > On Mon, Feb 03, 2025 at 11:27:56AM +0800, Edward Adam Davis wrote:
> > > syzbot reported a uninit-value in full_proxy_unlocked_ioctl. [1]
> > >
> > > The newly created fsd does not initialize methods, and increases the
> > > initialization of methods for fsd.
> > >
> > > [1]
> > > BUG: KMSAN: uninit-value in full_proxy_unlocked_ioctl+0xed/0x3a0 fs/debugfs/file.c:399
> > >  full_proxy_unlocked_ioctl+0xed/0x3a0 fs/debugfs/file.c:399
> > >  vfs_ioctl fs/ioctl.c:51 [inline]
> > >  __do_sys_ioctl fs/ioctl.c:906 [inline]
> > >  __se_sys_ioctl+0x246/0x440 fs/ioctl.c:892
> > >  __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:892
> > >  x64_sys_call+0x19f0/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:17
> > >  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> > >  do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
> > >  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> > >
> > > Fixes: 41a0ecc0997c ("debugfs: get rid of dynamically allocation proxy_ops")
> > > Reported-by: syzbot+8928e473a91452caca2f@...kaller.appspotmail.com
> > > Closes: https://syzkaller.appspot.com/bug?extid=8928e473a91452caca2f
> > > Tested-by: syzbot+8928e473a91452caca2f@...kaller.appspotmail.com
> > > Signed-off-by: Edward Adam Davis <eadavis@...com>
> > > ---
> > >  fs/debugfs/file.c | 1 +
> > >  1 file changed, 1 insertion(+)
> > 
> > Is this still an issue on 6.14-rc1, specifically after commit
> > 57b314752ec0 ("debugfs: Fix the missing initializations in
> > __debugfs_file_get()")?
> No.

Great, I'll forget about it then :)

thanks!

greg k-h