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| author | Kees Cook <keescook@chromium.org> | 2014-04-03 22:29:50 +0200 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2014-10-16 23:38:54 +0200 |
| commit | 80d6b0c2eed2a504f6740cd1f5ea76dc50abfc4d (patch) | |
| tree | 32f6d8a1c5a2250cc3f303df545dfbf52da62d19 /arch/arm/kernel/vmlinux.lds.S | |
| parent | ARM: mm: allow non-text sections to be non-executable (diff) | |
| download | linux-80d6b0c2eed2a504f6740cd1f5ea76dc50abfc4d.tar.xz linux-80d6b0c2eed2a504f6740cd1f5ea76dc50abfc4d.zip | |
ARM: mm: allow text and rodata sections to be read-only
This introduces CONFIG_DEBUG_RODATA, making kernel text and rodata
read-only. Additionally, this splits rodata from text so that rodata can
also be NX, which may lead to wasted memory when aligning to SECTION_SIZE.
The read-only areas are made writable during ftrace updates and kexec.
Signed-off-by: Kees Cook <keescook@chromium.org>
Tested-by: Laura Abbott <lauraa@codeaurora.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
Diffstat (limited to 'arch/arm/kernel/vmlinux.lds.S')
| -rw-r--r-- | arch/arm/kernel/vmlinux.lds.S | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S index 18fd68a295ea..3afcb6c2cf06 100644 --- a/arch/arm/kernel/vmlinux.lds.S +++ b/arch/arm/kernel/vmlinux.lds.S @@ -120,6 +120,9 @@ SECTIONS ARM_CPU_KEEP(PROC_INFO) } +#ifdef CONFIG_DEBUG_RODATA + . = ALIGN(1<<SECTION_SHIFT); +#endif RO_DATA(PAGE_SIZE) . = ALIGN(4); |