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>
40 lines
808 B
C
40 lines
808 B
C
#include <linux/kernel.h>
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#include <linux/jump_label.h>
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#include "insn.h"
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#include "patch.h"
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#ifdef HAVE_JUMP_LABEL
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static void __arch_jump_label_transform(struct jump_entry *entry,
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enum jump_label_type type,
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bool is_static)
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{
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void *addr = (void *)entry->code;
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unsigned int insn;
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if (type == JUMP_LABEL_ENABLE)
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insn = arm_gen_branch(entry->code, entry->target);
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else
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insn = arm_gen_nop();
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if (is_static)
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__patch_text_early(addr, insn);
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else
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patch_text(addr, insn);
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}
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void arch_jump_label_transform(struct jump_entry *entry,
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enum jump_label_type type)
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{
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__arch_jump_label_transform(entry, type, false);
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}
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void arch_jump_label_transform_static(struct jump_entry *entry,
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enum jump_label_type type)
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{
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__arch_jump_label_transform(entry, type, true);
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}
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#endif
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