leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ARM: Prepare for randomized task_struct

Browse Source 
With the new task struct randomization, we can run into a build
failure for certain random seeds, which will place fields beyond
the allow immediate size in the assembly:

arch/arm/kernel/entry-armv.S: Assembler messages:
arch/arm/kernel/entry-armv.S:803: Error: bad immediate value for offset (4096)

Only two constants in asm-offset.h are affected, and I'm changing
both of them here to work correctly in all configurations.

One more macro has the problem, but is currently unused, so this
removes it instead of adding complexity.

Suggested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
[kees: Adjust commit log slightly]
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Arnd Bergmann
2017-06-30 18:03:59 +02:00
committed by Kees Cook
parent 1854c19cae
commit ffa47aa678
3 changed files with 10 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/include/asm/assembler.h
View File

@@ -87,6 +87,8 @@
#define CALGN(code...)
#endif
#define IMM12_MASK 0xfff
/*
* Enable and disable interrupts
*/