A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-07 20:33:58 -04:00
Code Issues Projects Releases Packages Wiki Activity

ANDROID: mm: add generic __va_function and __pa_function

Browse source 
We use non-canonical CFI jump tables with CONFIG_CFI_CLANG, which
means the compiler replaces function address references with the
address of the function's CFI jump table entry. This results in
__pa_symbol(function), for example, returning the physical address
of the jump table entry, which can lead to address space confusion
since the jump table itself points to a virtual address.

This change adds generic definitions for __pa/va_function, which
architectures that support CFI can override.

Bug: 166220312
Change-Id: If4a162de7854547d8437bf59be03eb6d16220832
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Git-commit: d509371db88a829fa13fbb066423b20fc4698845
Git-repo: https://android.googlesource.com/kernel/common/
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
This commit is contained in:
Sami Tolvanen 2020-09-10 15:33:56 -07:00 • committed by Prasad Sodagudi
commit 2c0cdded94
1 changed files with 8 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

8
include/linux/mm.h
View file

@ -116,6 +116,14 @@ extern int mmap_rnd_compat_bits __read_mostly;
#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
#endif
#ifndef __va_function
#define __va_function(x) (x)
#endif
#ifndef __pa_function
#define __pa_function(x) __pa_symbol(x)
#endif
#ifndef page_to_virt
#define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
#endif