8969691343
If we use jump table in module init, there are marked as removed in __jump_table section after init is done. But we already applied ro permissions on the module, so we can't modify a read only section (crash in remove_jump_label_module_init). Make the __jump_table section rw. Signed-off-by: Matthieu CASTET <castet.matthieu@free.fr> Cc: Xiaotian Feng <xtfeng@gmail.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Siarhei Liakh <sliakh.lkml@gmail.com> Cc: Xuxian Jiang <jiang@cs.ncsu.edu> Cc: James Morris <jmorris@namei.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Dave Jones <davej@redhat.com> Cc: Kees Cook <kees.cook@canonical.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> LKML-Reference: <4D3C3F20.7030203@free.fr> Signed-off-by: Ingo Molnar <mingo@elte.hu>
37 lines
695 B
C
37 lines
695 B
C
#ifndef _ASM_X86_JUMP_LABEL_H
|
|
#define _ASM_X86_JUMP_LABEL_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/types.h>
|
|
#include <asm/nops.h>
|
|
|
|
#define JUMP_LABEL_NOP_SIZE 5
|
|
|
|
# define JUMP_LABEL_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t"
|
|
|
|
# define JUMP_LABEL(key, label) \
|
|
do { \
|
|
asm goto("1:" \
|
|
JUMP_LABEL_INITIAL_NOP \
|
|
".pushsection __jump_table, \"aw\" \n\t"\
|
|
_ASM_PTR "1b, %l[" #label "], %c0 \n\t" \
|
|
".popsection \n\t" \
|
|
: : "i" (key) : : label); \
|
|
} while (0)
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#ifdef CONFIG_X86_64
|
|
typedef u64 jump_label_t;
|
|
#else
|
|
typedef u32 jump_label_t;
|
|
#endif
|
|
|
|
struct jump_entry {
|
|
jump_label_t code;
|
|
jump_label_t target;
|
|
jump_label_t key;
|
|
};
|
|
|
|
#endif
|