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powerpc fixes for 5.10 #6

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One commit to implement copy_from_kernel_nofault_allowed(), otherwise
 copy_from_kernel_nofault() can trigger warnings when accessing bad addresses in
 some configurations.
 
 Thanks to:
   Christophe Leroy, Qian Cai.
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Merge tag 'powerpc-5.10-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fix from Michael Ellerman:
 "One commit to implement copy_from_kernel_nofault_allowed(), otherwise
  copy_from_kernel_nofault() can trigger warnings when accessing bad
  addresses in some configurations.

  Thanks to Christophe Leroy and Qian Cai"

* tag 'powerpc-5.10-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/mm: Fix KUAP warning by providing copy_from_kernel_nofault_allowed()
This commit is contained in:
Linus Torvalds 2020-12-10 16:36:30 -08:00
commit 47003b9971
2 changed files with 10 additions and 1 deletions
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2
arch/powerpc/mm/Makefile
View File

@ -5,7 +5,7 @@
ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC)
obj-y := fault.o mem.o pgtable.o mmap.o \
obj-y := fault.o mem.o pgtable.o mmap.o maccess.o \
init_$(BITS).o pgtable_$(BITS).o \
pgtable-frag.o ioremap.o ioremap_$(BITS).o \
init-common.o mmu_context.o drmem.o

9
arch/powerpc/mm/maccess.c Normal file
View File

@ -0,0 +1,9 @@
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/uaccess.h>
#include <linux/kernel.h>
bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
{
return is_kernel_addr((unsigned long)unsafe_src);
}