| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20241025100700.3714552-18-ruanjinjie@huawei.com>
Date: Fri, 25 Oct 2024 18:06:58 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: <oleg@...hat.com>, <linux@...linux.org.uk>, <will@...nel.org>,
<mark.rutland@....com>, <catalin.marinas@....com>, <sstabellini@...nel.org>,
<maz@...nel.org>, <tglx@...utronix.de>, <peterz@...radead.org>,
<luto@...nel.org>, <kees@...nel.org>, <wad@...omium.org>,
<akpm@...ux-foundation.org>, <samitolvanen@...gle.com>, <arnd@...db.de>,
<ojeda@...nel.org>, <rppt@...nel.org>, <hca@...ux.ibm.com>,
<aliceryhl@...gle.com>, <samuel.holland@...ive.com>, <paulmck@...nel.org>,
<aquini@...hat.com>, <petr.pavlu@...e.com>, <ruanjinjie@...wei.com>,
<viro@...iv.linux.org.uk>, <rmk+kernel@...linux.org.uk>, <ardb@...nel.org>,
<wangkefeng.wang@...wei.com>, <surenb@...gle.com>,
<linus.walleij@...aro.org>, <yangyj.ee@...il.com>, <broonie@...nel.org>,
<mbenes@...e.cz>, <puranjay@...nel.org>, <pcc@...gle.com>,
<guohanjun@...wei.com>, <sudeep.holla@....com>,
<Jonathan.Cameron@...wei.com>, <prarit@...hat.com>, <liuwei09@...tc.cn>,
<dwmw@...zon.co.uk>, <oliver.upton@...ux.dev>, <kristina.martsenko@....com>,
<ptosi@...gle.com>, <frederic@...nel.org>, <vschneid@...hat.com>,
<thiago.bauermann@...aro.org>, <joey.gouly@....com>,
<liuyuntao12@...wei.com>, <leobras@...hat.com>,
<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
<xen-devel@...ts.xenproject.org>
Subject: [PATCH -next v4 17/19] entry: Add syscall arch functions to use generic syscall for arm64
Add some syscall arch functions to support arm64 to use generic syscall
code, which do not affect existing architectures that use generic entry:
- arch_pre/post_report_syscall_entry/exit().
Also make syscall_exit_work() not static and move report_single_step() to
thread_info.h, which can be used by arm64 later.
Suggested-by: Mark Rutland <mark.rutland@....com>
Suggested-by: Kevin Brodsky <kevin.brodsky@....com>
Suggested-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
---
include/linux/entry-common.h | 1 +
include/linux/thread_info.h | 13 +++++
kernel/entry/syscall-common.c | 100 ++++++++++++++++++++++++++++++----
3 files changed, 103 insertions(+), 11 deletions(-)
diff --git a/include/linux/entry-common.h b/include/linux/entry-common.h
index 1ae3143d4b12..39a2d41af05e 100644
--- a/include/linux/entry-common.h
+++ b/include/linux/entry-common.h
@@ -178,4 +178,5 @@ void syscall_exit_to_user_mode_work(struct pt_regs *regs);
*/
void syscall_exit_to_user_mode(struct pt_regs *regs);
+void syscall_exit_work(struct pt_regs *regs, unsigned long work);
#endif
diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index 9ea0b28068f4..062de9666ef3 100644
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -55,6 +55,19 @@ 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)
+
+/*
+ * If SYSCALL_EMU is set, then the only reason to report is when
+ * SINGLESTEP is set (i.e. PTRACE_SYSEMU_SINGLESTEP). This syscall
+ * instruction has been already reported in syscall_enter_from_user_mode().
+ */
+static inline bool report_single_step(unsigned long work)
+{
+ if (work & SYSCALL_WORK_SYSCALL_EMU)
+ return false;
+
+ return work & SYSCALL_WORK_SYSCALL_EXIT_TRAP;
+}
#endif
#include <asm/thread_info.h>
diff --git a/kernel/entry/syscall-common.c b/kernel/entry/syscall-common.c
index 0eb036986ad4..73f87d09e04e 100644
--- a/kernel/entry/syscall-common.c
+++ b/kernel/entry/syscall-common.c
@@ -17,6 +17,49 @@ static inline void syscall_enter_audit(struct pt_regs *regs, long syscall)
}
}
+/**
+ * arch_pre_report_syscall_entry - Architecture specific work before
+ * report_syscall_entry().
+ *
+ * Invoked from syscall_trace_enter() to prepare for ptrace_report_syscall_entry().
+ * Defaults to NOP.
+ *
+ * The main purpose is for saving a general purpose register clobbered
+ * in the tracee.
+ */
+static inline unsigned long arch_pre_report_syscall_entry(struct pt_regs *regs);
+
+#ifndef arch_pre_report_syscall_entry
+static inline unsigned long arch_pre_report_syscall_entry(struct pt_regs *regs)
+{
+ return 0;
+}
+#endif
+
+/**
+ * arch_post_report_syscall_entry - Architecture specific work after
+ * report_syscall_entry().
+ *
+ * Invoked from syscall_trace_enter() after calling ptrace_report_syscall_entry().
+ * Defaults to NOP.
+ *
+ * The main purpose is for restoring a general purpose register clobbered
+ * in the trace saved in arch_pre_report_syscall_entry(), also it can
+ * do something arch-specific according to the return value of
+ * ptrace_report_syscall_entry().
+ */
+static inline void arch_post_report_syscall_entry(struct pt_regs *regs,
+ unsigned long saved_reg,
+ long ret);
+
+#ifndef arch_post_report_syscall_entry
+static inline void arch_post_report_syscall_entry(struct pt_regs *regs,
+ unsigned long saved_reg,
+ long ret)
+{
+}
+#endif
+
long syscall_trace_enter(struct pt_regs *regs, long syscall,
unsigned long work)
{
@@ -34,7 +77,9 @@ long syscall_trace_enter(struct pt_regs *regs, long syscall,
/* Handle ptrace */
if (work & (SYSCALL_WORK_SYSCALL_TRACE | SYSCALL_WORK_SYSCALL_EMU)) {
+ unsigned long saved_reg = arch_pre_report_syscall_entry(regs);
ret = ptrace_report_syscall_entry(regs);
+ arch_post_report_syscall_entry(regs, saved_reg, ret);
if (ret || (work & SYSCALL_WORK_SYSCALL_EMU))
return -1L;
}
@@ -71,20 +116,50 @@ noinstr void syscall_enter_from_user_mode_prepare(struct pt_regs *regs)
instrumentation_end();
}
-/*
- * If SYSCALL_EMU is set, then the only reason to report is when
- * SINGLESTEP is set (i.e. PTRACE_SYSEMU_SINGLESTEP). This syscall
- * instruction has been already reported in syscall_enter_from_user_mode().
+/**
+ * arch_pre_report_syscall_exit - Architecture specific work before
+ * report_syscall_exit().
+ *
+ * Invoked from syscall_exit_work() to prepare for ptrace_report_syscall_exit().
+ * Defaults to NOP.
+ *
+ * The main purpose is for saving a general purpose register clobbered
+ * in the trace.
*/
-static inline bool report_single_step(unsigned long work)
-{
- if (work & SYSCALL_WORK_SYSCALL_EMU)
- return false;
+static inline unsigned long arch_pre_report_syscall_exit(struct pt_regs *regs,
+ unsigned long work);
- return work & SYSCALL_WORK_SYSCALL_EXIT_TRAP;
+#ifndef arch_pre_report_syscall_exit
+static inline unsigned long arch_pre_report_syscall_exit(struct pt_regs *regs,
+ unsigned long work)
+{
+ return 0;
}
+#endif
+
+/**
+ * arch_post_report_syscall_exit - Architecture specific work after
+ * report_syscall_exit().
+ *
+ * Invoked from syscall_exit_work() after calling ptrace_report_syscall_exit().
+ * Defaults to NOP.
+ *
+ * The main purpose is for restoring a general purpose register clobbered
+ * in the trace saved in arch_pre_report_syscall_exit().
+ */
+static inline void arch_post_report_syscall_exit(struct pt_regs *regs,
+ unsigned long saved_reg,
+ unsigned long work);
+
+#ifndef arch_post_report_syscall_exit
+static inline void arch_post_report_syscall_exit(struct pt_regs *regs,
+ unsigned long saved_reg,
+ unsigned long work)
+{
+}
+#endif
-static void syscall_exit_work(struct pt_regs *regs, unsigned long work)
+void syscall_exit_work(struct pt_regs *regs, unsigned long work)
{
bool step;
@@ -107,8 +182,11 @@ static void syscall_exit_work(struct pt_regs *regs, unsigned long work)
trace_sys_exit(regs, syscall_get_return_value(current, regs));
step = report_single_step(work);
- if (step || work & SYSCALL_WORK_SYSCALL_TRACE)
+ if (step || work & SYSCALL_WORK_SYSCALL_TRACE) {
+ unsigned long saved_reg = arch_pre_report_syscall_exit(regs, work);
ptrace_report_syscall_exit(regs, step);
+ arch_post_report_syscall_exit(regs, saved_reg, work);
+ }
}
/*
--
2.34.1
Powered by blists - more mailing lists