+ syscalls-use-uaccess_kernel-in-addr_limit_user_check.patch added to -mm tree

+ syscalls-use-uaccess_kernel-in-addr_limit_user_check.patch added to -mm tree

[akpm]

The patch titled
     Subject: syscalls: use uaccess_kernel in addr_limit_user_check
has been added to the -mm tree.  Its filename is
     syscalls-use-uaccess_kernel-in-addr_limit_user_check.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/syscalls-use-uaccess_kernel-in-addr_limit_user_check.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/syscalls-use-uaccess_kernel-in-addr_limit_user_check.patch

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Christoph Hellwig <hch@lst.de>
Subject: syscalls: use uaccess_kernel in addr_limit_user_check

Patch series "clean up address limit helpers".

In preparation for eventually phasing out direct use of set_fs(), this
series removes the segment_eq() arch helper that is only used to implement
or duplicate the uaccess_kernel() API, and then adds descriptive helpers
to force the kernel address limit.


This patch (of 6):

Use the uaccess_kernel helper instead of duplicating it.

Link: http://lkml.kernel.org/r/20200710135706.537715-1-hch@lst.de
Link: http://lkml.kernel.org/r/20200710135706.537715-2-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/syscalls.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/syscalls.h~syscalls-use-uaccess_kernel-in-addr_limit_user_check
+++ a/include/linux/syscalls.h
@@ -263,7 +263,7 @@ static inline void addr_limit_user_check
 		return;
 #endif
 
-	if (CHECK_DATA_CORRUPTION(!segment_eq(get_fs(), USER_DS),
+	if (CHECK_DATA_CORRUPTION(uaccess_kernel(),
 				  "Invalid address limit on user-mode return"))
 		force_sig(SIGKILL);
 
_

Patches currently in -mm which might be from hch@lst.de are

syscalls-use-uaccess_kernel-in-addr_limit_user_check.patch
nds32-use-uaccess_kernel-in-show_regs.patch
riscv-include-asm-pgtableh-in-asm-uaccessh.patch
uaccess-remove-segment_eq.patch
uaccess-add-force_uaccess_beginend-helpers.patch
exec-use-force_uaccess_begin-during-exec-and-exit.patch