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| author |   Adrian Hunter <adrian.hunter@intel.com> | 2020-05-12 15:19:11 +0300 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2020-06-15 14:09:49 +0200 |
| commit | 69e49088692899d25dedfa22f00dfb9761e86ed7 (patch) | |
| tree | 1efb7c7e3b4a231830ed40bec4f16016ccfb40ce /kernel/kprobes.c | |
| parent | kprobes: Add symbols for kprobe insn pages (diff) | |
| download | wireguard-linux-69e49088692899d25dedfa22f00dfb9761e86ed7.tar.xz wireguard-linux-69e49088692899d25dedfa22f00dfb9761e86ed7.zip | |
kprobes: Add perf ksymbol events for kprobe insn pages
Symbols are needed for tools to describe instruction addresses. Pages
allocated for kprobe's purposes need symbols to be created for them.
Add such symbols to be visible via perf ksymbol events.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Link: https://lkml.kernel.org/r/20200512121922.8997-5-adrian.hunter@intel.com
Diffstat (limited to 'kernel/kprobes.c')
| -rw-r--r-- | kernel/kprobes.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 058c0be3464b..2b58740ca0f3 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -35,6 +35,7 @@ #include <linux/ftrace.h> #include <linux/cpu.h> #include <linux/jump_label.h> +#include <linux/perf_event.h> #include <asm/sections.h> #include <asm/cacheflush.h> @@ -184,6 +185,10 @@ kprobe_opcode_t *__get_insn_slot(struct kprobe_insn_cache *c) kip->cache = c; list_add_rcu(&kip->list, &c->pages); slot = kip->insns; + + /* Record the perf ksymbol register event after adding the page */ + perf_event_ksymbol(PERF_RECORD_KSYMBOL_TYPE_OOL, (unsigned long)kip->insns, + PAGE_SIZE, false, c->sym); out: mutex_unlock(&c->mutex); return slot; @@ -202,6 +207,13 @@ static int collect_one_slot(struct kprobe_insn_page *kip, int idx) * next time somebody inserts a probe. */ if (!list_is_singular(&kip->list)) { + /* + * Record perf ksymbol unregister event before removing + * the page. + */ + perf_event_ksymbol(PERF_RECORD_KSYMBOL_TYPE_OOL, + (unsigned long)kip->insns, PAGE_SIZE, true, + kip->cache->sym); list_del_rcu(&kip->list); synchronize_rcu(); kip->cache->free(kip->insns); |