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>
38 lines
695 B
C
38 lines
695 B
C
#ifndef _ASM_X86_JUMP_LABEL_H
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#define _ASM_X86_JUMP_LABEL_H
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#ifdef __KERNEL__
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#include <linux/types.h>
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#include <asm/nops.h>
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#define JUMP_LABEL_NOP_SIZE 5
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# define JUMP_LABEL_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t"
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# define JUMP_LABEL(key, label) \
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do { \
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asm goto("1:" \
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JUMP_LABEL_INITIAL_NOP \
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".pushsection __jump_table, \"aw\" \n\t"\
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_ASM_PTR "1b, %l[" #label "], %c0 \n\t" \
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".popsection \n\t" \
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: : "i" (key) : : label); \
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} while (0)
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#endif /* __KERNEL__ */
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#ifdef CONFIG_X86_64
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typedef u64 jump_label_t;
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#else
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typedef u32 jump_label_t;
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#endif
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struct jump_entry {
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jump_label_t code;
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jump_label_t target;
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jump_label_t key;
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};
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#endif
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