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Message-Id: <20211208044808.872554-5-pcc@google.com>
Date: Tue, 7 Dec 2021 20:48:06 -0800
From: Peter Collingbourne <pcc@...gle.com>
To: Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>, Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Andy Lutomirski <luto@...nel.org>,
Kees Cook <keescook@...omium.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Masahiro Yamada <masahiroy@...nel.org>,
Sami Tolvanen <samitolvanen@...gle.com>,
YiFei Zhu <yifeifz2@...inois.edu>,
Mark Rutland <mark.rutland@....com>,
Frederic Weisbecker <frederic@...nel.org>,
Viresh Kumar <viresh.kumar@...aro.org>,
Andrey Konovalov <andreyknvl@...il.com>,
Peter Collingbourne <pcc@...gle.com>,
Gabriel Krisman Bertazi <krisman@...labora.com>,
Chris Hyser <chris.hyser@...cle.com>,
Daniel Vetter <daniel.vetter@...ll.ch>,
Chris Wilson <chris@...is-wilson.co.uk>,
Arnd Bergmann <arnd@...db.de>,
Dmitry Vyukov <dvyukov@...gle.com>,
Christian Brauner <christian.brauner@...ntu.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Alexey Gladkov <legion@...nel.org>,
Ran Xiaokai <ran.xiaokai@....com.cn>,
David Hildenbrand <david@...hat.com>,
Xiaofeng Cao <caoxiaofeng@...ong.com>,
Cyrill Gorcunov <gorcunov@...il.com>,
Thomas Cedeno <thomascedeno@...gle.com>,
Marco Elver <elver@...gle.com>,
Alexander Potapenko <glider@...gle.com>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Evgenii Stepanov <eugenis@...gle.com>
Subject: [PATCH v3 4/6] uaccess-buffer: add CONFIG_GENERIC_ENTRY support
Add uaccess logging support on architectures that use
CONFIG_GENERIC_ENTRY (currently only s390 and x86).
Link: https://linux-review.googlesource.com/id/I3c5eb19a7e4a1dbe6095f6971f7826c4b0663f7d
Signed-off-by: Peter Collingbourne <pcc@...gle.com>
---
arch/Kconfig | 6 ++++++
include/linux/entry-common.h | 2 ++
include/linux/thread_info.h | 4 ++++
kernel/entry/common.c | 10 ++++++++++
4 files changed, 22 insertions(+)
diff --git a/arch/Kconfig b/arch/Kconfig
index d3c4ab249e9c..c4dcab5279ac 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -31,6 +31,7 @@ config HOTPLUG_SMT
bool
config GENERIC_ENTRY
+ select HAVE_ARCH_UACCESS_BUFFER
bool
config KPROBES
@@ -1312,6 +1313,11 @@ config ARCH_HAS_PARANOID_L1D_FLUSH
config DYNAMIC_SIGFRAME
bool
+config HAVE_ARCH_UACCESS_BUFFER
+ bool
+ help
+ Select if the architecture's syscall entry/exit code supports uaccess buffers.
+
source "kernel/gcov/Kconfig"
source "scripts/gcc-plugins/Kconfig"
diff --git a/include/linux/entry-common.h b/include/linux/entry-common.h
index 2e2b8d6140ed..973fcd1d48a3 100644
--- a/include/linux/entry-common.h
+++ b/include/linux/entry-common.h
@@ -42,12 +42,14 @@
SYSCALL_WORK_SYSCALL_EMU | \
SYSCALL_WORK_SYSCALL_AUDIT | \
SYSCALL_WORK_SYSCALL_USER_DISPATCH | \
+ SYSCALL_WORK_UACCESS_BUFFER_ENTRY | \
ARCH_SYSCALL_WORK_ENTER)
#define SYSCALL_WORK_EXIT (SYSCALL_WORK_SYSCALL_TRACEPOINT | \
SYSCALL_WORK_SYSCALL_TRACE | \
SYSCALL_WORK_SYSCALL_AUDIT | \
SYSCALL_WORK_SYSCALL_USER_DISPATCH | \
SYSCALL_WORK_SYSCALL_EXIT_TRAP | \
+ SYSCALL_WORK_UACCESS_BUFFER_EXIT | \
ARCH_SYSCALL_WORK_EXIT)
/*
diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index ad0c4e041030..b0f8ea86967f 100644
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -46,6 +46,8 @@ enum syscall_work_bit {
SYSCALL_WORK_BIT_SYSCALL_AUDIT,
SYSCALL_WORK_BIT_SYSCALL_USER_DISPATCH,
SYSCALL_WORK_BIT_SYSCALL_EXIT_TRAP,
+ SYSCALL_WORK_BIT_UACCESS_BUFFER_ENTRY,
+ SYSCALL_WORK_BIT_UACCESS_BUFFER_EXIT,
};
#define SYSCALL_WORK_SECCOMP BIT(SYSCALL_WORK_BIT_SECCOMP)
@@ -55,6 +57,8 @@ enum syscall_work_bit {
#define SYSCALL_WORK_SYSCALL_AUDIT BIT(SYSCALL_WORK_BIT_SYSCALL_AUDIT)
#define SYSCALL_WORK_SYSCALL_USER_DISPATCH BIT(SYSCALL_WORK_BIT_SYSCALL_USER_DISPATCH)
#define SYSCALL_WORK_SYSCALL_EXIT_TRAP BIT(SYSCALL_WORK_BIT_SYSCALL_EXIT_TRAP)
+#define SYSCALL_WORK_UACCESS_BUFFER_ENTRY BIT(SYSCALL_WORK_BIT_UACCESS_BUFFER_ENTRY)
+#define SYSCALL_WORK_UACCESS_BUFFER_EXIT BIT(SYSCALL_WORK_BIT_UACCESS_BUFFER_EXIT)
#endif
#include <asm/thread_info.h>
diff --git a/kernel/entry/common.c b/kernel/entry/common.c
index d5a61d565ad5..57c4bb01a554 100644
--- a/kernel/entry/common.c
+++ b/kernel/entry/common.c
@@ -6,6 +6,7 @@
#include <linux/livepatch.h>
#include <linux/audit.h>
#include <linux/tick.h>
+#include <linux/uaccess-buffer.h>
#include "common.h"
@@ -70,6 +71,9 @@ static long syscall_trace_enter(struct pt_regs *regs, long syscall,
return ret;
}
+ if (work & SYSCALL_WORK_UACCESS_BUFFER_ENTRY)
+ uaccess_buffer_syscall_entry();
+
/* Either of the above might have changed the syscall number */
syscall = syscall_get_nr(current, regs);
@@ -197,14 +201,17 @@ static unsigned long exit_to_user_mode_loop(struct pt_regs *regs,
static void exit_to_user_mode_prepare(struct pt_regs *regs)
{
unsigned long ti_work = READ_ONCE(current_thread_info()->flags);
+ bool uaccess_buffer_pending;
lockdep_assert_irqs_disabled();
/* Flush pending rcuog wakeup before the last need_resched() check */
tick_nohz_user_enter_prepare();
+ uaccess_buffer_pending = uaccess_buffer_pre_exit_loop();
if (unlikely(ti_work & EXIT_TO_USER_MODE_WORK))
ti_work = exit_to_user_mode_loop(regs, ti_work);
+ uaccess_buffer_post_exit_loop(uaccess_buffer_pending);
arch_exit_to_user_mode_prepare(regs, ti_work);
@@ -247,6 +254,9 @@ static void syscall_exit_work(struct pt_regs *regs, unsigned long work)
audit_syscall_exit(regs);
+ if (work & SYSCALL_WORK_UACCESS_BUFFER_EXIT)
+ uaccess_buffer_syscall_exit();
+
if (work & SYSCALL_WORK_SYSCALL_TRACEPOINT)
trace_sys_exit(regs, syscall_get_return_value(current, regs));
--
2.34.1.173.g76aa8bc2d0-goog
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