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Date: Mon, 13 Jul 2020 21:19:39 +0300
From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To: linux-kernel@...r.kernel.org
Cc: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
Andi Kleen <ak@...ux.intel.com>, Jessica Yu <jeyu@...nel.org>,
"Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
"David S. Miller" <davem@...emloft.net>,
Masami Hiramatsu <mhiramat@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Ingo Molnar <mingo@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Peter Zijlstra <peterz@...radead.org>,
"Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
Kees Cook <keescook@...omium.org>,
Will Deacon <will@...nel.org>, Alexandre Ghiti <alex@...ti.fr>,
Thomas Gleixner <tglx@...utronix.de>,
Arnd Bergmann <arnd@...db.de>,
Sami Tolvanen <samitolvanen@...gle.com>,
Peter Collingbourne <pcc@...gle.com>,
Krzysztof Kozlowski <krzk@...nel.org>,
Stephen Boyd <sboyd@...nel.org>
Subject: [PATCH 3/3] kprobes: Flag out CONFIG_MODULES dependent code
Remove CONFIG_MODULES dependency by flagging out the dependent code. This
allows to use kprobes in a kernel without support for loadable modules,
which could be useful for a test kernel or perhaps an embedded kernel.
Cc: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
arch/Kconfig | 1 -
include/linux/module.h | 14 +++++++-------
kernel/kprobes.c | 9 +++++++++
kernel/trace/trace_kprobe.c | 16 +++++++++++++++-
4 files changed, 31 insertions(+), 9 deletions(-)
diff --git a/arch/Kconfig b/arch/Kconfig
index 8cc35dc556c7..bb59cdf335ab 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -61,7 +61,6 @@ config OPROFILE_NMI_TIMER
config KPROBES
bool "Kprobes"
- depends on MODULES
depends on HAVE_KPROBES
select KALLSYMS
help
diff --git a/include/linux/module.h b/include/linux/module.h
index 857b84bf9e90..eaa8ad02f75c 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -290,6 +290,13 @@ extern typeof(name) __mod_##type##__##name##_device_table \
struct notifier_block;
+enum module_state {
+ MODULE_STATE_LIVE, /* Normal state. */
+ MODULE_STATE_COMING, /* Full formed, running module_init. */
+ MODULE_STATE_GOING, /* Going away. */
+ MODULE_STATE_UNFORMED, /* Still setting it up. */
+};
+
#ifdef CONFIG_MODULES
extern int modules_disabled; /* for sysctl */
@@ -305,13 +312,6 @@ struct module_use {
struct module *source, *target;
};
-enum module_state {
- MODULE_STATE_LIVE, /* Normal state. */
- MODULE_STATE_COMING, /* Full formed, running module_init. */
- MODULE_STATE_GOING, /* Going away. */
- MODULE_STATE_UNFORMED, /* Still setting it up. */
-};
-
struct mod_tree_node {
struct module *mod;
struct latch_tree_node node;
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index bbe3423cb2b8..047353008cb6 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1608,6 +1608,7 @@ static int check_kprobe_address_safe(struct kprobe *p,
goto out;
}
+#ifdef CONFIG_MODULES
/*
* If the module freed .init.text, we couldn't insert
* kprobes in there.
@@ -1618,6 +1619,7 @@ static int check_kprobe_address_safe(struct kprobe *p,
*probed_mod = NULL;
ret = -ENOENT;
}
+#endif
}
out:
preempt_enable();
@@ -2214,6 +2216,7 @@ int kprobe_add_area_blacklist(unsigned long start, unsigned long end)
return 0;
}
+#ifdef CONFIG_MODULES
/* Remove all symbols in given area from kprobe blacklist */
static void kprobe_remove_area_blacklist(unsigned long start, unsigned long end)
{
@@ -2231,6 +2234,7 @@ static void kprobe_remove_ksym_blacklist(unsigned long entry)
{
kprobe_remove_area_blacklist(entry, entry + 1);
}
+#endif
int __init __weak arch_populate_kprobe_blacklist(void)
{
@@ -2274,6 +2278,7 @@ static int __init populate_kprobe_blacklist(unsigned long *start,
return ret ? : arch_populate_kprobe_blacklist();
}
+#ifdef CONFIG_MODULES
static void add_module_kprobe_blacklist(struct module *mod)
{
unsigned long start, end;
@@ -2319,6 +2324,10 @@ static void remove_module_kprobe_blacklist(struct module *mod)
kprobe_remove_area_blacklist(start, end);
}
}
+#else
+static void add_module_kprobe_blacklist(struct module *mod) {}
+static void remove_module_kprobe_blacklist(struct module *mod) {}
+#endif /* CONFIG_MODULES */
/* Module notifier call back, checking kprobes on the module */
static int kprobes_module_callback(struct notifier_block *nb,
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 710ec6a6aa8f..7fcd1bf2d96e 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -103,8 +103,9 @@ static nokprobe_inline bool trace_kprobe_has_gone(struct trace_kprobe *tk)
return !!(kprobe_gone(&tk->rp.kp));
}
+#ifdef CONFIG_MODULES
static nokprobe_inline bool trace_kprobe_within_module(struct trace_kprobe *tk,
- struct module *mod)
+ struct module *mod)
{
int len = strlen(mod->name);
const char *name = trace_kprobe_symbol(tk);
@@ -129,6 +130,17 @@ static nokprobe_inline bool trace_kprobe_module_exist(struct trace_kprobe *tk)
return ret;
}
+#else
+static nokprobe_inline bool trace_kprobe_within_module(struct trace_kprobe *tk,
+ struct module *mod)
+{
+ return false;
+}
+static nokprobe_inline bool trace_kprobe_module_exist(struct trace_kprobe *tk)
+{
+ return false;
+}
+#endif
static bool trace_kprobe_is_busy(struct dyn_event *ev)
{
@@ -685,10 +697,12 @@ static int trace_kprobe_module_callback(struct notifier_block *nb,
/* Don't need to check busy - this should have gone. */
__unregister_trace_kprobe(tk);
ret = __register_trace_kprobe(tk);
+#ifdef CONFIG_MODULES
if (ret)
pr_warn("Failed to re-register probe %s on %s: %d\n",
trace_probe_name(&tk->tp),
mod->name, ret);
+#endif
}
}
mutex_unlock(&event_mutex);
--
2.25.1
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