From: Masami Hiramatsu <mhiramat@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Ingo Molnar <mingo@kernel.org>
Cc: X86 ML <x86@kernel.org>, Masami Hiramatsu <mhiramat@kernel.org>,
Daniel Xu <dxu@dxuuu.xyz>,
linux-kernel@vger.kernel.org, bpf@vger.kernel.org,
kuba@kernel.org, mingo@redhat.com, ast@kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@alien8.de>,
Peter Zijlstra <peterz@infradead.org>,
kernel-team@fb.com, yhs@fb.com, linux-ia64@vger.kernel.org,
Abhishek Sagar <sagar.abhishek@gmail.com>,
Andrii Nakryiko <andrii.nakryiko@gmail.com>,
Paul McKenney <paulmck@kernel.org>
Subject: [PATCH -tip v11 00/27] kprobes: Fix stacktrace with kretprobes on x86
Date: Tue, 14 Sep 2021 23:38:27 +0900 [thread overview]
Message-ID: <163163030719.489837.2236069935502195491.stgit@devnote2> (raw)
Hello,
This is the 11th version of the series to fix the stacktrace with kretprobe on x86.
The previous version is here;
https://lore.kernel.org/all/162756755600.301564.4957591913842010341.stgit@devnote2/
This version is rebased on the latest tip/master branch and includes the kprobe cleanup
series[1][2]. No code change.
[1] https://lore.kernel.org/bpf/162748615977.59465.13262421617578791515.stgit@devnote2/
[2] https://lore.kernel.org/linux-csky/20210727133426.2919710-1-punitagrawal@gmail.com/
With this series, unwinder can unwind stack correctly from ftrace as below;
# cd /sys/kernel/debug/tracing
# echo > trace
# echo 1 > options/sym-offset
# echo r vfs_read >> kprobe_events
# echo r full_proxy_read >> kprobe_events
# echo traceoff:1 > events/kprobes/r_vfs_read_0/trigger
# echo stacktrace:1 > events/kprobes/r_full_proxy_read_0/trigger
# echo 1 > events/kprobes/enable
# cat /sys/kernel/debug/kprobes/list
ffffffff813bedf0 r full_proxy_read+0x0 [FTRACE]
ffffffff812c13e0 r vfs_read+0x0 [FTRACE]
# echo 0 > events/kprobes/enable
# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 3/3 #P:8
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / _-=> migrate-disable
# |||| / delay
# TASK-PID CPU# ||||| TIMESTAMP FUNCTION
# | | | ||||| | |
cat-136 [000] ...1. 14.474966: r_full_proxy_read_0: (vfs_read+0x99/0x190 <- full_proxy_read)
cat-136 [000] ...1. 14.474970: <stack trace>
=> kretprobe_trace_func+0x209/0x300
=> kretprobe_dispatcher+0x9d/0xb0
=> __kretprobe_trampoline_handler+0xd4/0x1b0
=> trampoline_handler+0x43/0x60
=> __kretprobe_trampoline+0x2a/0x50
=> vfs_read+0x99/0x190
=> ksys_read+0x68/0xe0
=> do_syscall_64+0x3b/0x90
=> entry_SYSCALL_64_after_hwframe+0x44/0xae
cat-136 [000] ...1. 14.474971: r_vfs_read_0: (ksys_read+0x68/0xe0 <- vfs_read)
This shows the double return probes (vfs_read() and full_proxy_read()) on the stack
correctly unwinded. (vfs_read() returns to 'ksys_read+0x68' and full_proxy_read()
returns to 'vfs_read+0x99')
This also changes the kretprobe behavisor a bit, now the instraction pointer in
the 'pt_regs' passed to kretprobe user handler is correctly set the real return
address. So user handlers can get it via instruction_pointer() API, and can use
stack_trace_save_regs().
You can also get this series from
git://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git kprobes/kretprobe-stackfix-v11
Thank you,
---
Josh Poimboeuf (3):
objtool: Add frame-pointer-specific function ignore
objtool: Ignore unwind hints for ignored functions
x86/kprobes: Add UNWIND_HINT_FUNC on kretprobe_trampoline()
Masami Hiramatsu (19):
kprobes: treewide: Cleanup the error messages for kprobes
kprobes: Fix coding style issues
kprobes: Use IS_ENABLED() instead of kprobes_built_in()
kprobes: Add assertions for required lock
kprobes: treewide: Use 'kprobe_opcode_t *' for the code address in get_optimized_kprobe()
kprobes: Use bool type for functions which returns boolean value
ia64: kprobes: Fix to pass correct trampoline address to the handler
kprobes: treewide: Replace arch_deref_entry_point() with dereference_symbol_descriptor()
kprobes: treewide: Remove trampoline_address from kretprobe_trampoline_handler()
kprobes: treewide: Make it harder to refer kretprobe_trampoline directly
kprobes: Add kretprobe_find_ret_addr() for searching return address
ARC: Add instruction_pointer_set() API
ia64: Add instruction_pointer_set() API
arm: kprobes: Make space for instruction pointer on stack
kprobes: Enable stacktrace from pt_regs in kretprobe handler
x86/kprobes: Push a fake return address at kretprobe_trampoline
x86/unwind: Recover kretprobe trampoline entry
tracing: Show kretprobe unknown indicator only for kretprobe_trampoline
x86/kprobes: Fixup return address in generic trampoline handler
Punit Agrawal (5):
kprobes: Do not use local variable when creating debugfs file
kprobes: Use helper to parse boolean input from userspace
kprobe: Simplify prepare_kprobe() by dropping redundant version
csky: ftrace: Drop duplicate implementation of arch_check_ftrace_location()
kprobes: Make arch_check_ftrace_location static
arch/arc/include/asm/kprobes.h | 2
arch/arc/include/asm/ptrace.h | 5
arch/arc/kernel/kprobes.c | 13 -
arch/arm/probes/kprobes/core.c | 15 -
arch/arm/probes/kprobes/opt-arm.c | 7
arch/arm64/include/asm/kprobes.h | 2
arch/arm64/kernel/probes/kprobes.c | 10
arch/arm64/kernel/probes/kprobes_trampoline.S | 4
arch/csky/include/asm/kprobes.h | 2
arch/csky/kernel/probes/ftrace.c | 7
arch/csky/kernel/probes/kprobes.c | 14 -
arch/csky/kernel/probes/kprobes_trampoline.S | 4
arch/ia64/include/asm/ptrace.h | 5
arch/ia64/kernel/kprobes.c | 15 -
arch/mips/kernel/kprobes.c | 26 +
arch/parisc/kernel/kprobes.c | 6
arch/powerpc/include/asm/kprobes.h | 2
arch/powerpc/kernel/kprobes.c | 29 -
arch/powerpc/kernel/optprobes.c | 8
arch/powerpc/kernel/stacktrace.c | 2
arch/riscv/include/asm/kprobes.h | 2
arch/riscv/kernel/probes/kprobes.c | 15 -
arch/riscv/kernel/probes/kprobes_trampoline.S | 4
arch/s390/include/asm/kprobes.h | 2
arch/s390/kernel/kprobes.c | 16 -
arch/s390/kernel/stacktrace.c | 2
arch/sh/include/asm/kprobes.h | 2
arch/sh/kernel/kprobes.c | 12 -
arch/sparc/include/asm/kprobes.h | 2
arch/sparc/kernel/kprobes.c | 12 -
arch/x86/include/asm/kprobes.h | 1
arch/x86/include/asm/unwind.h | 23 +
arch/x86/include/asm/unwind_hints.h | 5
arch/x86/kernel/kprobes/core.c | 71 +++-
arch/x86/kernel/kprobes/opt.c | 6
arch/x86/kernel/unwind_frame.c | 3
arch/x86/kernel/unwind_guess.c | 3
arch/x86/kernel/unwind_orc.c | 21 +
include/linux/kprobes.h | 113 ++++--
include/linux/objtool.h | 12 +
kernel/kprobes.c | 502 ++++++++++++++-----------
kernel/trace/trace_kprobe.c | 2
kernel/trace/trace_output.c | 17 -
lib/error-inject.c | 3
tools/include/linux/objtool.h | 12 +
tools/objtool/check.c | 2
46 files changed, 607 insertions(+), 436 deletions(-)
--
Masami Hiramatsu (Linaro) <mhiramat@kernel.org>
next reply other threads:[~2021-09-14 14:38 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-14 14:38 Masami Hiramatsu [this message]
2021-09-14 14:38 ` [PATCH -tip v11 01/27] kprobes: Do not use local variable when creating debugfs file Masami Hiramatsu
2021-09-14 14:38 ` [PATCH -tip v11 02/27] kprobes: Use helper to parse boolean input from userspace Masami Hiramatsu
2021-09-14 14:38 ` [PATCH -tip v11 03/27] kprobe: Simplify prepare_kprobe() by dropping redundant version Masami Hiramatsu
2021-09-14 14:39 ` [PATCH -tip v11 04/27] csky: ftrace: Drop duplicate implementation of arch_check_ftrace_location() Masami Hiramatsu
2021-09-14 14:39 ` [PATCH -tip v11 05/27] kprobes: Make arch_check_ftrace_location static Masami Hiramatsu
2021-09-14 14:39 ` [PATCH -tip v11 06/27] kprobes: treewide: Cleanup the error messages for kprobes Masami Hiramatsu
2021-09-14 14:39 ` [PATCH -tip v11 07/27] kprobes: Fix coding style issues Masami Hiramatsu
2021-09-14 14:39 ` [PATCH -tip v11 08/27] kprobes: Use IS_ENABLED() instead of kprobes_built_in() Masami Hiramatsu
2021-09-14 14:39 ` [PATCH -tip v11 09/27] kprobes: Add assertions for required lock Masami Hiramatsu
2021-09-14 14:40 ` [PATCH -tip v11 10/27] kprobes: treewide: Use 'kprobe_opcode_t *' for the code address in get_optimized_kprobe() Masami Hiramatsu
2021-09-14 14:40 ` [PATCH -tip v11 11/27] kprobes: Use bool type for functions which returns boolean value Masami Hiramatsu
2021-09-14 14:40 ` [PATCH -tip v11 12/27] ia64: kprobes: Fix to pass correct trampoline address to the handler Masami Hiramatsu
2021-09-14 14:40 ` [PATCH -tip v11 13/27] kprobes: treewide: Replace arch_deref_entry_point() with dereference_symbol_descriptor() Masami Hiramatsu
2021-09-14 14:40 ` [PATCH -tip v11 14/27] kprobes: treewide: Remove trampoline_address from kretprobe_trampoline_handler() Masami Hiramatsu
2021-09-14 14:40 ` [PATCH -tip v11 15/27] kprobes: treewide: Make it harder to refer kretprobe_trampoline directly Masami Hiramatsu
2021-09-14 14:41 ` [PATCH -tip v11 16/27] kprobes: Add kretprobe_find_ret_addr() for searching return address Masami Hiramatsu
2021-09-14 14:41 ` [PATCH -tip v11 17/27] objtool: Add frame-pointer-specific function ignore Masami Hiramatsu
2021-09-14 14:41 ` [PATCH -tip v11 18/27] objtool: Ignore unwind hints for ignored functions Masami Hiramatsu
2021-09-14 14:41 ` [PATCH -tip v11 19/27] x86/kprobes: Add UNWIND_HINT_FUNC on kretprobe_trampoline() Masami Hiramatsu
2021-09-14 14:41 ` [PATCH -tip v11 20/27] ARC: Add instruction_pointer_set() API Masami Hiramatsu
2021-09-14 14:41 ` [PATCH -tip v11 21/27] ia64: " Masami Hiramatsu
2021-09-14 14:42 ` [PATCH -tip v11 22/27] arm: kprobes: Make space for instruction pointer on stack Masami Hiramatsu
2021-09-14 14:42 ` [PATCH -tip v11 23/27] kprobes: Enable stacktrace from pt_regs in kretprobe handler Masami Hiramatsu
2021-09-14 14:42 ` [PATCH -tip v11 24/27] x86/kprobes: Push a fake return address at kretprobe_trampoline Masami Hiramatsu
2021-09-14 14:42 ` [PATCH -tip v11 25/27] x86/unwind: Recover kretprobe trampoline entry Masami Hiramatsu
2021-09-14 14:42 ` [PATCH -tip v11 26/27] tracing: Show kretprobe unknown indicator only for kretprobe_trampoline Masami Hiramatsu
2021-09-14 14:42 ` [PATCH -tip v11 27/27] x86/kprobes: Fixup return address in generic trampoline handler Masami Hiramatsu
2021-09-14 22:55 ` [PATCH -tip v11 00/27] kprobes: Fix stacktrace with kretprobes on x86 Andrii Nakryiko
2021-09-29 2:24 ` Masami Hiramatsu
2021-09-30 18:17 ` Alexei Starovoitov
2021-09-30 19:34 ` Thomas Gleixner
2021-09-30 21:22 ` Steven Rostedt
2021-09-30 23:11 ` Thomas Gleixner
2021-09-30 23:27 ` Masami Hiramatsu
2021-09-30 23:37 ` Steven Rostedt
2021-10-01 0:35 ` Masami Hiramatsu
2021-09-30 23:54 ` Masami Hiramatsu
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=163163030719.489837.2236069935502195491.stgit@devnote2 \
--to=mhiramat@kernel.org \
--cc=andrii.nakryiko@gmail.com \
--cc=ast@kernel.org \
--cc=bp@alien8.de \
--cc=bpf@vger.kernel.org \
--cc=dxu@dxuuu.xyz \
--cc=jpoimboe@redhat.com \
--cc=kernel-team@fb.com \
--cc=kuba@kernel.org \
--cc=linux-ia64@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=mingo@redhat.com \
--cc=paulmck@kernel.org \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
--cc=sagar.abhishek@gmail.com \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
--cc=yhs@fb.com \
/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).