linux-kernel - Re: [git pull] misc uaccess stuff

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Date:   Wed, 3 Jun 2020 13:44:39 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [git pull] misc uaccess stuff

On Wed, Jun 03, 2020 at 08:23:06PM +0100, Al Viro wrote:
> 	uaccess patches that really didn't fit anywhere else.
> kvm_hv_set_msr() patch left as-is; __put_user() is by no means
> final there, but that'll be dealt with along with other KVM
> uaccess stuff next cycle.
> 
> The following changes since commit b44f687386875b714dae2afa768e73401e45c21c:
> 
>   drm/i915/gem: Replace user_access_begin by user_write_access_begin (2020-05-01 12:35:22 +1000)
> 
> are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git uaccess.misc
> 
> for you to fetch changes up to 4ec76a2b74c72ef9eed875ce63e27a5e7f8d80cc:
> 
>   bpf: make bpf_check_uarg_tail_zero() use check_zeroed_user() (2020-06-01 14:42:37 -0400)
> 
> ----------------------------------------------------------------
> Al Viro (9):
>       pselect6() and friends: take handling the combined 6th/7th args into helper
>       binfmt_elf: don't bother with __{put,copy_to}_user()
>       binfmt_elf_fdpic: don't use __... uaccess primitives

This patch breaks arm32:

$ make -sj"$(nproc)" ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- allyesconfig fs/binfmt_elf_fdpic.o
...
In file included from ./include/linux/sched/task.h:11,
                 from ./include/linux/sched/signal.h:9,
                 from ./include/linux/rcuwait.h:6,
                 from ./include/linux/percpu-rwsem.h:7,
                 from ./include/linux/fs.h:34,
                 from fs/binfmt_elf_fdpic.c:11:
./include/linux/uaccess.h:149:1: note: declared here
  149 | copy_to_user(void __user *to, const void *from, unsigned long n)
      | ^~~~~~~~~~~~
fs/binfmt_elf_fdpic.c:612:7: error: too few arguments to function 'copy_to_user'
  612 |   if (copy_to_user(ent + nr, &v))    \
      |       ^~~~~~~~~~~~
fs/binfmt_elf_fdpic.c:659:2: note: in expansion of macro 'NEW_AUX_ENT'
  659 |  NEW_AUX_ENT(AT_EXECFN, bprm->exec);
      |  ^~~~~~~~~~~
...

Cheers,
Nathan