From: Peter Zijlstra <peterz@infradead.org>
To: x86@kernel.org
Cc: peterz@infradead.org, linux-kernel@vger.kernel.org,
rostedt@goodmis.org, mhiramat@kernel.org, bristot@redhat.com,
jbaron@akamai.com, torvalds@linux-foundation.org,
tglx@linutronix.de, mingo@kernel.org, namit@vmware.com,
hpa@zytor.com, luto@kernel.org, ard.biesheuvel@linaro.org,
jpoimboe@redhat.com, pbonzini@redhat.com,
mathieu.desnoyers@efficios.com
Subject: [PATCH v4 08/18] static_call: Avoid kprobes on inline static_call()s
Date: Fri, 01 May 2020 22:28:57 +0200 [thread overview]
Message-ID: <20200501202944.244063853@infradead.org> (raw)
In-Reply-To: 20200501202849.647891881@infradead.org
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@infradead.org>
---
arch/x86/kernel/kprobes/opt.c | 4 +-
include/linux/static_call.h | 11 +++++++
kernel/kprobes.c | 2 +
kernel/static_call.c | 64 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 80 insertions(+), 1 deletion(-)
--- a/arch/x86/kernel/kprobes/opt.c
+++ b/arch/x86/kernel/kprobes/opt.c
@@ -16,6 +16,7 @@
#include <linux/kallsyms.h>
#include <linux/ftrace.h>
#include <linux/frame.h>
+#include <linux/static_call.h>
#include <asm/text-patching.h>
#include <asm/cacheflush.h>
@@ -209,7 +210,8 @@ static int copy_optimized_instructions(u
/* 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;
--- 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_
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_
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))
--- 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/static_call.h>
#include <asm/sections.h>
#include <asm/cacheflush.h>
@@ -1560,6 +1561,7 @@ static int check_kprobe_address_safe(str
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;
--- a/kernel/static_call.c
+++ b/kernel/static_call.c
@@ -203,8 +203,58 @@ static int __static_call_init(struct 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,
@@ -274,6 +324,20 @@ static struct notifier_block static_call
#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;
+
+#ifdef CONFIG_MODULES
+ ret = __static_call_mod_text_reserved(start, end);
+#endif
+ return ret;
+}
+
static void __init static_call_init(void)
{
int ret;
next prev parent reply other threads:[~2020-05-01 20:31 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-01 20:28 [PATCH v4 00/18] Add static_call() Peter Zijlstra
2020-05-01 20:28 ` [PATCH v4 01/18] notifier: Fix broken error handling pattern Peter Zijlstra
2020-05-01 23:35 ` Steven Rostedt
2020-05-01 20:28 ` [PATCH v4 02/18] module: Fix up module_notifier return values Peter Zijlstra
2020-05-01 20:28 ` [PATCH v4 03/18] module: Properly propagate MODULE_STATE_COMING failure Peter Zijlstra
2020-05-01 20:28 ` [PATCH v4 04/18] jump_label,module: Fix module lifetime for __jump_label_mod_text_reserved Peter Zijlstra
2020-05-01 20:28 ` [PATCH v4 05/18] compiler.h: Make __ADDRESSABLE() symbol truly unique Peter Zijlstra
2020-05-01 20:28 ` [PATCH v4 06/18] static_call: Add basic static call infrastructure Peter Zijlstra
2020-05-05 21:21 ` Josh Poimboeuf
2020-05-01 20:28 ` [PATCH v4 07/18] static_call: Add inline " Peter Zijlstra
2020-05-05 22:10 ` Josh Poimboeuf
2020-05-06 16:15 ` Peter Zijlstra
2020-05-01 20:28 ` Peter Zijlstra [this message]
2020-05-01 20:28 ` [PATCH v4 09/18] x86/static_call: Add out-of-line static call implementation Peter Zijlstra
2020-05-06 16:16 ` Peter Zijlstra
2020-05-01 20:28 ` [PATCH v4 10/18] x86/static_call: Add inline static call implementation for x86-64 Peter Zijlstra
2020-05-01 20:29 ` [PATCH v4 11/18] static_call: Simple self-test Peter Zijlstra
2020-05-01 20:29 ` [PATCH v4 12/18] tracepoint: Optimize using static_call() Peter Zijlstra
2020-05-13 8:48 ` [tracepoint] 01edfaf177: WARNING:at_kernel/static_call.c:#__static_call_update kernel test robot
2020-05-15 17:13 ` Peter Zijlstra
2020-05-01 20:29 ` [PATCH v4 13/18] x86/alternatives: Teach text_poke_bp() to emulate RET Peter Zijlstra
2020-05-01 20:29 ` [PATCH v4 14/18] static_call: Add static_cond_call() Peter Zijlstra
2020-05-02 13:08 ` Rasmus Villemoes
2020-05-03 12:58 ` Peter Zijlstra
2020-05-04 7:20 ` Rasmus Villemoes
2020-05-04 20:14 ` Peter Zijlstra
2020-05-05 7:50 ` Rasmus Villemoes
2020-05-05 9:38 ` Peter Zijlstra
2020-05-05 9:36 ` Peter Zijlstra
2020-05-05 18:13 ` Nick Desaulniers
2020-05-05 18:27 ` Nick Desaulniers
2020-05-05 18:48 ` Linus Torvalds
2020-05-05 19:00 ` Mathieu Desnoyers
2020-05-05 19:57 ` Nick Desaulniers
2020-05-05 20:27 ` Mathieu Desnoyers
2020-05-06 13:55 ` Peter Zijlstra
2020-05-06 14:01 ` Mathieu Desnoyers
2020-05-06 16:18 ` Peter Zijlstra
2020-05-06 13:51 ` Peter Zijlstra
2020-05-06 16:00 ` Peter Zijlstra
2020-05-06 17:16 ` Linus Torvalds
2020-05-06 19:57 ` Andy Lutomirski
2020-05-06 17:24 ` Josh Poimboeuf
2020-05-06 17:58 ` Peter Zijlstra
2020-05-06 18:09 ` Josh Poimboeuf
2020-05-06 18:16 ` Peter Zijlstra
2020-05-08 15:27 ` Peter Zijlstra
2020-05-08 15:47 ` Josh Poimboeuf
2020-05-08 16:17 ` Peter Zijlstra
2020-05-01 20:29 ` [PATCH v4 15/18] static_call: Handle tail-calls Peter Zijlstra
2020-05-06 18:10 ` Peter Zijlstra
2020-05-01 20:29 ` [PATCH v4 16/18] static_call: Allow early init Peter Zijlstra
2020-05-06 21:15 ` Josh Poimboeuf
2020-05-08 13:31 ` Peter Zijlstra
2020-05-08 14:27 ` Josh Poimboeuf
2020-05-08 15:30 ` Peter Zijlstra
2020-05-01 20:29 ` [PATCH v4 17/18] x86/perf, static_call: Optimize x86_pmu methods Peter Zijlstra
2020-05-01 20:29 ` [PATCH v4 18/18] objtool: Clean up elf_write() condition Peter Zijlstra
2020-05-06 17:32 ` [PATCH v4 00/18] Add static_call() Josh Poimboeuf
2020-05-06 18:05 ` Peter Zijlstra
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200501202944.244063853@infradead.org \
--to=peterz@infradead.org \
--cc=ard.biesheuvel@linaro.org \
--cc=bristot@redhat.com \
--cc=hpa@zytor.com \
--cc=jbaron@akamai.com \
--cc=jpoimboe@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@kernel.org \
--cc=mathieu.desnoyers@efficios.com \
--cc=mhiramat@kernel.org \
--cc=mingo@kernel.org \
--cc=namit@vmware.com \
--cc=pbonzini@redhat.com \
--cc=rostedt@goodmis.org \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).