46 lines
1.7 KiB
Diff
46 lines
1.7 KiB
Diff
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From aaaec2d292b7e1d07c35e07ba92917ee05a4a141 Mon Sep 17 00:00:00 2001
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From: Zhipeng Xie <xiezhipeng1@huawei.com>
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Date: Fri, 2 Nov 2018 17:25:03 +0000
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Subject: [PATCH 1008/1015] livepatch-patch-hook: support force enable/disable
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function
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we use immediate to indicate patch which bypass stack check.
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Signed-off-by: Zhipeng Xie <xiezhipeng1@huawei.com>
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---
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kmod/patch/livepatch-patch-hook.c | 11 +++++++++++
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1 files changed, 11 insertions(+), 0 deletions(-)
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diff --git a/kmod/patch/livepatch-patch-hook.c b/kmod/patch/livepatch-patch-hook.c
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index 2c0cadd..625ffbd 100644
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--- a/kmod/patch/livepatch-patch-hook.c
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+++ b/kmod/patch/livepatch-patch-hook.c
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@@ -228,6 +228,16 @@ extern struct kpatch_pre_patch_callback __kpatch_callbacks_pre_patch[], __kpatch
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extern struct kpatch_post_patch_callback __kpatch_callbacks_post_patch[], __kpatch_callbacks_post_patch_end[];
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extern struct kpatch_pre_unpatch_callback __kpatch_callbacks_pre_unpatch[], __kpatch_callbacks_pre_unpatch_end[];
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extern struct kpatch_post_unpatch_callback __kpatch_callbacks_post_unpatch[], __kpatch_callbacks_post_unpatch_end[];
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+extern unsigned long __kpatch_force_funcs[], __kpatch_force_funcs_end[];
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+
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+static int patch_is_func_forced(unsigned long addr)
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+{
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+ unsigned long *a;
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+ for (a = __kpatch_force_funcs; a < __kpatch_force_funcs_end; a++)
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+ if (*a == addr)
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+ return 1;
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+ return 0;
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+}
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#ifdef HAVE_CALLBACKS
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static int add_callbacks_to_patch_objects(void)
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@@ -393,6 +403,7 @@ static int __init patch_init(void)
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lfunc = &lfuncs[j];
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lfunc->old_name = func->kfunc->name;
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lfunc->new_func = (void *)func->kfunc->new_addr;
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+ lfunc->immediate = patch_is_func_forced(lfunc->new_func);
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#ifdef HAVE_SYMPOS
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lfunc->old_sympos = func->kfunc->sympos;
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#else
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--
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1.7.5.4
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