ab0615e2d6
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>
26 lines
547 B
C
26 lines
547 B
C
#ifndef _ASM_FIXMAP_H
|
|
#define _ASM_FIXMAP_H
|
|
|
|
#define FIXADDR_START 0xffc00000UL
|
|
#define FIXADDR_END 0xfff00000UL
|
|
#define FIXADDR_TOP (FIXADDR_END - PAGE_SIZE)
|
|
|
|
#include <asm/kmap_types.h>
|
|
|
|
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
|
|
};
|
|
|
|
void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
|
|
|
|
#include <asm-generic/fixmap.h>
|
|
|
|
#endif
|