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Date: Fri, 8 Apr 2022 09:51:24 +0900
From: Masami Hiramatsu <mhiramat@...nel.org>
To: Alexei Starovoitov <ast@...nel.org>,
Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: Daniel Borkmann <daniel@...earbox.net>,
Shubham Bansal <illusionist.neo@...il.com>,
Andrii Nakryiko <andrii@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>, bpf@...r.kernel.org,
kernel-team@...com, Jiri Olsa <jolsa@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>,
"Naveen N . Rao" <naveen.n.rao@...ux.ibm.com>,
Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
"David S . Miller" <davem@...emloft.net>,
linux-kernel@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
Will Deacon <will@...nel.org>,
Ard Biesheuvel <ardb@...nel.org>,
Russell King <linux@...linux.org.uk>,
Catalin Marinas <catalin.marinas@....com>,
linux-arm-kernel@...ts.infradead.org
Subject: [PATCH bpf v2 4/4] arm64: rethook: Replace kretprobe trampoline with rethook
Replace the kretprobe's trampoline code with the rethook on arm64.
The rethook on arm64 is almost renamed from kretprobe trampoline
code. The mechanism is completely same.
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
Changes in v2:
- Fix a compile warning about no prototype.
---
arch/arm64/Kconfig | 1
arch/arm64/include/asm/kprobes.h | 2 -
arch/arm64/include/asm/stacktrace.h | 2 -
arch/arm64/kernel/Makefile | 1
arch/arm64/kernel/probes/Makefile | 1
arch/arm64/kernel/probes/kprobes.c | 15 ----
arch/arm64/kernel/probes/kprobes_trampoline.S | 86 -------------------------
arch/arm64/kernel/rethook.c | 28 ++++++++
arch/arm64/kernel/rethook_trampoline.S | 87 +++++++++++++++++++++++++
arch/arm64/kernel/stacktrace.c | 9 +--
10 files changed, 123 insertions(+), 109 deletions(-)
delete mode 100644 arch/arm64/kernel/probes/kprobes_trampoline.S
create mode 100644 arch/arm64/kernel/rethook.c
create mode 100644 arch/arm64/kernel/rethook_trampoline.S
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 57c4c995965f..7d2945930283 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -204,6 +204,7 @@ config ARM64
select HAVE_SYSCALL_TRACEPOINTS
select HAVE_KPROBES
select HAVE_KRETPROBES
+ select HAVE_RETHOOK
select HAVE_GENERIC_VDSO
select IOMMU_DMA if IOMMU_SUPPORT
select IRQ_DOMAIN
diff --git a/arch/arm64/include/asm/kprobes.h b/arch/arm64/include/asm/kprobes.h
index 05cd82eeca13..4ac558058377 100644
--- a/arch/arm64/include/asm/kprobes.h
+++ b/arch/arm64/include/asm/kprobes.h
@@ -39,8 +39,6 @@ void arch_remove_kprobe(struct kprobe *);
int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr);
int kprobe_exceptions_notify(struct notifier_block *self,
unsigned long val, void *data);
-void __kretprobe_trampoline(void);
-void __kprobes *trampoline_probe_handler(struct pt_regs *regs);
#endif /* CONFIG_KPROBES */
#endif /* _ARM_KPROBES_H */
diff --git a/arch/arm64/include/asm/stacktrace.h b/arch/arm64/include/asm/stacktrace.h
index e77cdef9ca29..f781874f1609 100644
--- a/arch/arm64/include/asm/stacktrace.h
+++ b/arch/arm64/include/asm/stacktrace.h
@@ -58,7 +58,7 @@ struct stackframe {
DECLARE_BITMAP(stacks_done, __NR_STACK_TYPES);
unsigned long prev_fp;
enum stack_type prev_type;
-#ifdef CONFIG_KRETPROBES
+#if defined(CONFIG_RETHOOK)
struct llist_node *kr_cur;
#endif
};
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 986837d7ec82..62e033b1b095 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -60,6 +60,7 @@ obj-$(CONFIG_ACPI_NUMA) += acpi_numa.o
obj-$(CONFIG_ARM64_ACPI_PARKING_PROTOCOL) += acpi_parking_protocol.o
obj-$(CONFIG_PARAVIRT) += paravirt.o
obj-$(CONFIG_RANDOMIZE_BASE) += kaslr.o
+obj-$(CONFIG_RETHOOK) += rethook.o rethook_trampoline.o
obj-$(CONFIG_HIBERNATION) += hibernate.o hibernate-asm.o
obj-$(CONFIG_ELF_CORE) += elfcore.o
obj-$(CONFIG_KEXEC_CORE) += machine_kexec.o relocate_kernel.o \
diff --git a/arch/arm64/kernel/probes/Makefile b/arch/arm64/kernel/probes/Makefile
index 8e4be92e25b1..1fa58cda64ff 100644
--- a/arch/arm64/kernel/probes/Makefile
+++ b/arch/arm64/kernel/probes/Makefile
@@ -1,6 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_KPROBES) += kprobes.o decode-insn.o \
- kprobes_trampoline.o \
simulate-insn.o
obj-$(CONFIG_UPROBES) += uprobes.o decode-insn.o \
simulate-insn.o
diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c
index d9dfa82c1f18..4a3cc266e77e 100644
--- a/arch/arm64/kernel/probes/kprobes.c
+++ b/arch/arm64/kernel/probes/kprobes.c
@@ -399,21 +399,6 @@ int __init arch_populate_kprobe_blacklist(void)
return ret;
}
-void __kprobes __used *trampoline_probe_handler(struct pt_regs *regs)
-{
- return (void *)kretprobe_trampoline_handler(regs, (void *)regs->regs[29]);
-}
-
-void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
- struct pt_regs *regs)
-{
- ri->ret_addr = (kprobe_opcode_t *)regs->regs[30];
- ri->fp = (void *)regs->regs[29];
-
- /* replace return addr (x30) with trampoline */
- regs->regs[30] = (long)&__kretprobe_trampoline;
-}
-
int __kprobes arch_trampoline_kprobe(struct kprobe *p)
{
return 0;
diff --git a/arch/arm64/kernel/probes/kprobes_trampoline.S b/arch/arm64/kernel/probes/kprobes_trampoline.S
deleted file mode 100644
index 9a6499bed58b..000000000000
--- a/arch/arm64/kernel/probes/kprobes_trampoline.S
+++ /dev/null
@@ -1,86 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * trampoline entry and return code for kretprobes.
- */
-
-#include <linux/linkage.h>
-#include <asm/asm-offsets.h>
-#include <asm/assembler.h>
-
- .text
-
- .macro save_all_base_regs
- stp x0, x1, [sp, #S_X0]
- stp x2, x3, [sp, #S_X2]
- stp x4, x5, [sp, #S_X4]
- stp x6, x7, [sp, #S_X6]
- stp x8, x9, [sp, #S_X8]
- stp x10, x11, [sp, #S_X10]
- stp x12, x13, [sp, #S_X12]
- stp x14, x15, [sp, #S_X14]
- stp x16, x17, [sp, #S_X16]
- stp x18, x19, [sp, #S_X18]
- stp x20, x21, [sp, #S_X20]
- stp x22, x23, [sp, #S_X22]
- stp x24, x25, [sp, #S_X24]
- stp x26, x27, [sp, #S_X26]
- stp x28, x29, [sp, #S_X28]
- add x0, sp, #PT_REGS_SIZE
- stp lr, x0, [sp, #S_LR]
- /*
- * Construct a useful saved PSTATE
- */
- mrs x0, nzcv
- mrs x1, daif
- orr x0, x0, x1
- mrs x1, CurrentEL
- orr x0, x0, x1
- mrs x1, SPSel
- orr x0, x0, x1
- stp xzr, x0, [sp, #S_PC]
- .endm
-
- .macro restore_all_base_regs
- ldr x0, [sp, #S_PSTATE]
- and x0, x0, #(PSR_N_BIT | PSR_Z_BIT | PSR_C_BIT | PSR_V_BIT)
- msr nzcv, x0
- ldp x0, x1, [sp, #S_X0]
- ldp x2, x3, [sp, #S_X2]
- ldp x4, x5, [sp, #S_X4]
- ldp x6, x7, [sp, #S_X6]
- ldp x8, x9, [sp, #S_X8]
- ldp x10, x11, [sp, #S_X10]
- ldp x12, x13, [sp, #S_X12]
- ldp x14, x15, [sp, #S_X14]
- ldp x16, x17, [sp, #S_X16]
- ldp x18, x19, [sp, #S_X18]
- ldp x20, x21, [sp, #S_X20]
- ldp x22, x23, [sp, #S_X22]
- ldp x24, x25, [sp, #S_X24]
- ldp x26, x27, [sp, #S_X26]
- ldp x28, x29, [sp, #S_X28]
- .endm
-
-SYM_CODE_START(__kretprobe_trampoline)
- sub sp, sp, #PT_REGS_SIZE
-
- save_all_base_regs
-
- /* Setup a frame pointer. */
- add x29, sp, #S_FP
-
- mov x0, sp
- bl trampoline_probe_handler
- /*
- * Replace trampoline address in lr with actual orig_ret_addr return
- * address.
- */
- mov lr, x0
-
- /* The frame pointer (x29) is restored with other registers. */
- restore_all_base_regs
-
- add sp, sp, #PT_REGS_SIZE
- ret
-
-SYM_CODE_END(__kretprobe_trampoline)
diff --git a/arch/arm64/kernel/rethook.c b/arch/arm64/kernel/rethook.c
new file mode 100644
index 000000000000..07d8f6ea34a0
--- /dev/null
+++ b/arch/arm64/kernel/rethook.c
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Generic return hook for arm64.
+ * Most of the code is copied from arch/arm64/kernel/probes/kprobes.c
+ */
+
+#include <linux/kprobes.h>
+#include <linux/rethook.h>
+
+/* This is called from arch_rethook_trampoline() */
+unsigned long __used arch_rethook_trampoline_callback(struct pt_regs *regs);
+
+unsigned long __used arch_rethook_trampoline_callback(struct pt_regs *regs)
+{
+ return rethook_trampoline_handler(regs, regs->regs[29]);
+}
+NOKPROBE_SYMBOL(arch_rethook_trampoline_callback);
+
+int arch_rethook_prepare(struct rethook_node *rhn, struct pt_regs *regs, bool mcount)
+{
+ rhn->ret_addr = regs->regs[30];
+ rhn->frame = regs->regs[29];
+
+ /* replace return addr (x30) with trampoline */
+ regs->regs[30] = (u64)arch_rethook_trampoline;
+ return 0;
+}
+NOKPROBE_SYMBOL(arch_rethook_prepare);
diff --git a/arch/arm64/kernel/rethook_trampoline.S b/arch/arm64/kernel/rethook_trampoline.S
new file mode 100644
index 000000000000..146d4553674c
--- /dev/null
+++ b/arch/arm64/kernel/rethook_trampoline.S
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * trampoline entry and return code for rethook.
+ * Renamed from arch/arm64/kernel/probes/kprobes_trampoline.S
+ */
+
+#include <linux/linkage.h>
+#include <asm/asm-offsets.h>
+#include <asm/assembler.h>
+
+ .text
+
+ .macro save_all_base_regs
+ stp x0, x1, [sp, #S_X0]
+ stp x2, x3, [sp, #S_X2]
+ stp x4, x5, [sp, #S_X4]
+ stp x6, x7, [sp, #S_X6]
+ stp x8, x9, [sp, #S_X8]
+ stp x10, x11, [sp, #S_X10]
+ stp x12, x13, [sp, #S_X12]
+ stp x14, x15, [sp, #S_X14]
+ stp x16, x17, [sp, #S_X16]
+ stp x18, x19, [sp, #S_X18]
+ stp x20, x21, [sp, #S_X20]
+ stp x22, x23, [sp, #S_X22]
+ stp x24, x25, [sp, #S_X24]
+ stp x26, x27, [sp, #S_X26]
+ stp x28, x29, [sp, #S_X28]
+ add x0, sp, #PT_REGS_SIZE
+ stp lr, x0, [sp, #S_LR]
+ /*
+ * Construct a useful saved PSTATE
+ */
+ mrs x0, nzcv
+ mrs x1, daif
+ orr x0, x0, x1
+ mrs x1, CurrentEL
+ orr x0, x0, x1
+ mrs x1, SPSel
+ orr x0, x0, x1
+ stp xzr, x0, [sp, #S_PC]
+ .endm
+
+ .macro restore_all_base_regs
+ ldr x0, [sp, #S_PSTATE]
+ and x0, x0, #(PSR_N_BIT | PSR_Z_BIT | PSR_C_BIT | PSR_V_BIT)
+ msr nzcv, x0
+ ldp x0, x1, [sp, #S_X0]
+ ldp x2, x3, [sp, #S_X2]
+ ldp x4, x5, [sp, #S_X4]
+ ldp x6, x7, [sp, #S_X6]
+ ldp x8, x9, [sp, #S_X8]
+ ldp x10, x11, [sp, #S_X10]
+ ldp x12, x13, [sp, #S_X12]
+ ldp x14, x15, [sp, #S_X14]
+ ldp x16, x17, [sp, #S_X16]
+ ldp x18, x19, [sp, #S_X18]
+ ldp x20, x21, [sp, #S_X20]
+ ldp x22, x23, [sp, #S_X22]
+ ldp x24, x25, [sp, #S_X24]
+ ldp x26, x27, [sp, #S_X26]
+ ldp x28, x29, [sp, #S_X28]
+ .endm
+
+SYM_CODE_START(arch_rethook_trampoline)
+ sub sp, sp, #PT_REGS_SIZE
+
+ save_all_base_regs
+
+ /* Setup a frame pointer. */
+ add x29, sp, #S_FP
+
+ mov x0, sp
+ bl arch_rethook_trampoline_callback
+ /*
+ * Replace trampoline address in lr with actual orig_ret_addr return
+ * address.
+ */
+ mov lr, x0
+
+ /* The frame pointer (x29) is restored with other registers. */
+ restore_all_base_regs
+
+ add sp, sp, #PT_REGS_SIZE
+ ret
+
+SYM_CODE_END(arch_rethook_trampoline)
diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index e4103e085681..5b717af4b555 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c
@@ -8,6 +8,7 @@
#include <linux/export.h>
#include <linux/ftrace.h>
#include <linux/kprobes.h>
+#include <linux/rethook.h>
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/sched/task_stack.h>
@@ -38,7 +39,7 @@ static notrace void start_backtrace(struct stackframe *frame, unsigned long fp,
{
frame->fp = fp;
frame->pc = pc;
-#ifdef CONFIG_KRETPROBES
+#if defined(CONFIG_RETHOOK)
frame->kr_cur = NULL;
#endif
@@ -134,9 +135,9 @@ static int notrace unwind_frame(struct task_struct *tsk,
frame->pc = orig_pc;
}
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
-#ifdef CONFIG_KRETPROBES
- if (is_kretprobe_trampoline(frame->pc))
- frame->pc = kretprobe_find_ret_addr(tsk, (void *)frame->fp, &frame->kr_cur);
+#ifdef CONFIG_RETHOOK
+ if (is_rethook_trampoline(frame->pc))
+ frame->pc = rethook_find_ret_addr(tsk, frame->fp, &frame->kr_cur);
#endif
return 0;
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