The following commit has been merged into the core/static_call branch of tip:
Commit-ID: 6333e8f73b834f54e395a056e6002403f0862c51
Gitweb: https://git.kernel.org/tip/6333e8f73b834f54e395a056e6002403f0862c51
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Tue, 18 Aug 2020 15:57:43 +02:00
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Tue, 01 Sep 2020 09:58:04 +02:00
static_call: Avoid kprobes on inline static_call()s
Similar to how we disallow kprobes on any other dynamic text
(ftrace/jump_label) also disallow kprobes on inline static_call()s.
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20200818135804.744920586@xxxxxxxxxxxxx
---
arch/x86/kernel/kprobes/opt.c | 4 +-
include/linux/static_call.h | 11 ++++++-
kernel/kprobes.c | 2 +-
kernel/static_call.c | 68 ++++++++++++++++++++++++++++++++++-
4 files changed, 84 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/kprobes/opt.c b/arch/x86/kernel/kprobes/opt.c
index 40f3804..c068e21 100644
--- a/arch/x86/kernel/kprobes/opt.c
+++ b/arch/x86/kernel/kprobes/opt.c
@@ -18,6 +18,7 @@
#include <linux/ftrace.h>
#include <linux/frame.h>
#include <linux/pgtable.h>
+#include <linux/static_call.h>
#include <asm/text-patching.h>
#include <asm/cacheflush.h>
@@ -210,7 +211,8 @@ static int copy_optimized_instructions(u8 *dest, u8 *src, u8 *real)
/* Check whether the address range is reserved */
if (ftrace_text_reserved(src, src + len - 1) ||
alternatives_text_reserved(src, src + len - 1) ||
- jump_label_text_reserved(src, src + len - 1))
+ jump_label_text_reserved(src, src + len - 1) ||
+ static_call_text_reserved(src, src + len - 1))
return -EBUSY;
return len;
diff --git a/include/linux/static_call.h b/include/linux/static_call.h
index 0d7f9ef..6f62ced 100644
--- a/include/linux/static_call.h
+++ b/include/linux/static_call.h
@@ -110,6 +110,7 @@ struct static_call_key {
extern void __static_call_update(struct static_call_key *key, void *tramp, void *func);
extern int static_call_mod_init(struct module *mod);
+extern int static_call_text_reserved(void *start, void *end);
#define DEFINE_STATIC_CALL(name, _func) \
DECLARE_STATIC_CALL(name, _func); \
@@ -153,6 +154,11 @@ void __static_call_update(struct static_call_key *key, void *tramp, void *func)
cpus_read_unlock();
}
+static inline int static_call_text_reserved(void *start, void *end)
+{
+ return 0;
+}
+
#define EXPORT_STATIC_CALL(name) \
EXPORT_SYMBOL(STATIC_CALL_KEY(name)); \
EXPORT_SYMBOL(STATIC_CALL_TRAMP(name))
@@ -182,6 +188,11 @@ void __static_call_update(struct static_call_key *key, void *tramp, void *func)
WRITE_ONCE(key->func, func);
}
+static inline int static_call_text_reserved(void *start, void *end)
+{
+ return 0;
+}
+
#define EXPORT_STATIC_CALL(name) EXPORT_SYMBOL(STATIC_CALL_KEY(name))
#define EXPORT_STATIC_CALL_GPL(name) EXPORT_SYMBOL_GPL(STATIC_CALL_KEY(name))
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 287b263..67e6a8c 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -36,6 +36,7 @@
#include <linux/cpu.h>
#include <linux/jump_label.h>
#include <linux/perf_event.h>
+#include <linux/static_call.h>
#include <asm/sections.h>
#include <asm/cacheflush.h>
@@ -1634,6 +1635,7 @@ static int check_kprobe_address_safe(struct kprobe *p,
if (!kernel_text_address((unsigned long) p->addr) ||
within_kprobe_blacklist((unsigned long) p->addr) ||
jump_label_text_reserved(p->addr, p->addr) ||
+ static_call_text_reserved(p->addr, p->addr) ||
find_bug((unsigned long)p->addr)) {
ret = -EINVAL;
goto out;
diff --git a/kernel/static_call.c b/kernel/static_call.c
index d243492..753b2f1 100644
--- a/kernel/static_call.c
+++ b/kernel/static_call.c
@@ -204,8 +204,58 @@ static int __static_call_init(struct module *mod,
return 0;
}
+static int addr_conflict(struct static_call_site *site, void *start, void *end)
+{
+ unsigned long addr = (unsigned long)static_call_addr(site);
+
+ if (addr <= (unsigned long)end &&
+ addr + CALL_INSN_SIZE > (unsigned long)start)
+ return 1;
+
+ return 0;
+}
+
+static int __static_call_text_reserved(struct static_call_site *iter_start,
+ struct static_call_site *iter_stop,
+ void *start, void *end)
+{
+ struct static_call_site *iter = iter_start;
+
+ while (iter < iter_stop) {
+ if (addr_conflict(iter, start, end))
+ return 1;
+ iter++;
+ }
+
+ return 0;
+}
+
#ifdef CONFIG_MODULES
+static int __static_call_mod_text_reserved(void *start, void *end)
+{
+ struct module *mod;
+ int ret;
+
+ preempt_disable();
+ mod = __module_text_address((unsigned long)start);
+ WARN_ON_ONCE(__module_text_address((unsigned long)end) != mod);
+ if (!try_module_get(mod))
+ mod = NULL;
+ preempt_enable();
+
+ if (!mod)
+ return 0;
+
+ ret = __static_call_text_reserved(mod->static_call_sites,
+ mod->static_call_sites + mod->num_static_call_sites,
+ start, end);
+
+ module_put(mod);
+
+ return ret;
+}
+
static int static_call_add_module(struct module *mod)
{
return __static_call_init(mod, mod->static_call_sites,
@@ -273,8 +323,26 @@ static struct notifier_block static_call_module_nb = {
.notifier_call = static_call_module_notify,
};
+#else
+
+static inline int __static_call_mod_text_reserved(void *start, void *end)
+{
+ return 0;
+}
+
#endif /* CONFIG_MODULES */
+int static_call_text_reserved(void *start, void *end)
+{
+ int ret = __static_call_text_reserved(__start_static_call_sites,
+ __stop_static_call_sites, start, end);
+
+ if (ret)
+ return ret;
+
+ return __static_call_mod_text_reserved(start, end);
+}
+
static void __init static_call_init(void)
{
int ret;
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