diff options
| author | Rabin Vincent <rabin@rab.in> | 2014-04-24 23:28:57 +0200 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2014-10-16 23:38:53 +0200 |
| commit | ab0615e2d6fb074764a3e4d05f1326fa2fdb4627 (patch) | |
| tree | 50f160291b6102404b8482c29247099eaf1e68a8 /arch/arm/include/asm/fixmap.h | |
| parent | arm: fixmap: implement __set_fixmap() (diff) | |
| download | linux-ab0615e2d6fb074764a3e4d05f1326fa2fdb4627.tar.xz linux-ab0615e2d6fb074764a3e4d05f1326fa2fdb4627.zip | |
arm: use fixmap for text patching when text is RO
Use fixmaps for text patching when the kernel text is read-only,
inspired by x86. This makes jump labels and kprobes work with the
currently available CONFIG_DEBUG_SET_MODULE_RONX and the upcoming
CONFIG_DEBUG_RODATA options.
Signed-off-by: Rabin Vincent <rabin@rab.in>
[kees: fixed up for merge with "arm: use generic fixmap.h"]
[kees: added parse acquire/release annotations to pass C=1 builds]
[kees: always use stop_machine to keep TLB flushing local]
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
Diffstat (limited to 'arch/arm/include/asm/fixmap.h')
| -rw-r--r-- | arch/arm/include/asm/fixmap.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/include/asm/fixmap.h b/arch/arm/include/asm/fixmap.h index 714606f70425..0415eae1df27 100644 --- a/arch/arm/include/asm/fixmap.h +++ b/arch/arm/include/asm/fixmap.h @@ -11,6 +11,10 @@ enum fixed_addresses { FIX_KMAP_BEGIN, FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1, + /* Support writing RO kernel text via kprobes, jump labels, etc. */ + FIX_TEXT_POKE0, + FIX_TEXT_POKE1, + __end_of_fixed_addresses }; |