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exec: use force_uaccess_begin during exec and exit

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Both exec and exit want to ensure that the uaccess routines actually do
access user pointers.  Use the newly added force_uaccess_begin helper
instead of an open coded set_fs for that to prepare for kernel builds
where set_fs() does not exist.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Link: http://lkml.kernel.org/r/20200710135706.537715-7-hch@lst.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2020-08-11 18:33:50 -07:00 committed by Linus Torvalds
parent 3d13f313ce
commit fe81417596
2 changed files with 7 additions and 2 deletions
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7
fs/exec.c
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@ -1402,7 +1402,12 @@ int begin_new_exec(struct linux_binprm * bprm)
if (retval)
goto out_unlock;
set_fs(USER_DS);
/*
* Ensure that the uaccess routines can actually operate on userspace
* pointers:
*/
force_uaccess_begin();
me->flags &= ~(PF_RANDOMIZE | PF_FORKNOEXEC | PF_KTHREAD |
PF_NOFREEZE | PF_NO_SETAFFINITY);
flush_thread();

2
kernel/exit.c
View File

@ -732,7 +732,7 @@ void __noreturn do_exit(long code)
* mm_release()->clear_child_tid() from writing to a user-controlled
* kernel address.
*/
set_fs(USER_DS);
force_uaccess_begin();
if (unlikely(in_atomic())) {
pr_info("note: %s[%d] exited with preempt_count %d\n",