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From: "Lev R. Oshvang ." <levonshe@gmail.com>
To: kernelnewbies@kernelnewbies.org
Subject: passing __user function parameter from kernel_module result in EFAULT
Date: Tue, 21 Apr 2020 21:14:00 +0300	[thread overview]
Message-ID: <CAP22eLHaJCmSPD6n1HsknD-b2UUDm92CssaTdU7vmNHw_p6d0g@mail.gmail.com> (raw)

Hi all, I am trying to do a mount from kernel module in kernel 5.4 on x86_64.
It fails with -14,  I tried to set_fs(USER_DS) before calling do_mount
but it did not
 help.


do_mount() returns -EFAUTL when it checks filename validity just at
the very first lines of do_mount ().

Are there other tricks to do in order to overcome and access_ok checks?


Thanks,
Lev

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             reply	other threads:[~2020-04-24 18:16 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-21 18:14 Lev R. Oshvang . [this message]
2020-04-25  7:43 ` passing __user function parameter from kernel_module result in EFAULT Greg KH

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