From: Masami Hiramatsu <mhiramat@kernel.org>
To: linux-kernel@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>
Cc: Eddy_Wu@trendmicro.com, x86@kernel.org, davem@davemloft.net,
rostedt@goodmis.org, naveen.n.rao@linux.ibm.com,
anil.s.keshavamurthy@intel.com, linux-arch@vger.kernel.org,
cameron@moodycamel.com, oleg@redhat.com, will@kernel.org,
paulmck@kernel.org, mhiramat@kernel.org
Subject: [PATCH v4 00/23] kprobes: Unify kretprobe trampoline handlers and make kretprobe lockless
Date: Fri, 28 Aug 2020 21:26:38 +0900 [thread overview]
Message-ID: <159861759775.992023.12553306821235086809.stgit@devnote2> (raw)
Hi,
Here is the 4th version of the series to unify the kretprobe trampoline handler
and make kretprobe lockless.
Previous version is here;
https://lkml.kernel.org/r/159854631442.736475.5062989489155389472.stgit@devnote2
In this version, I updated the generic trampoline handler a bit, merge
the Peter's lockless patches(*), and add an RFC "remove task scan" patch
as [20/23].
(*) https://lkml.kernel.org/r/20200827161237.889877377@infradead.org
I ran some tests and ftracetest on x86-64. Mostly OK, but hit a BUG in the
trampoline handler once. I'm trying to reproduce it but not succeeded yet.
So this may need a careful review and tests.
I did something like:
mount -t debugfs debug /sys/kernel/debug
cd /sys/kernel/debug/tracing/
echo r:event1 vfs_read >> kprobe_events
echo r:event2 vfs_read %ax >> kprobe_events
echo r:event3 rw_verify_area %ax >> kprobe_events
echo 1 > events/kprobes/enable
sleep 1
less trace
cat ../kprobes/list
cd ~/linux/tools/testing/selftests/ftrace
./ftracetest
Then hits a BUG_ON at kernel/kprobes.c:1893 (no test executed, maybe
it happened when removing kretprobes?)
Thank you,
---
Masami Hiramatsu (17):
kprobes: Add generic kretprobe trampoline handler
x86/kprobes: Use generic kretprobe trampoline handler
arm: kprobes: Use generic kretprobe trampoline handler
arm64: kprobes: Use generic kretprobe trampoline handler
arc: kprobes: Use generic kretprobe trampoline handler
csky: kprobes: Use generic kretprobe trampoline handler
ia64: kprobes: Use generic kretprobe trampoline handler
mips: kprobes: Use generic kretprobe trampoline handler
parisc: kprobes: Use generic kretprobe trampoline handler
powerpc: kprobes: Use generic kretprobe trampoline handler
s390: kprobes: Use generic kretprobe trampoline handler
sh: kprobes: Use generic kretprobe trampoline handler
sparc: kprobes: Use generic kretprobe trampoline handler
kprobes: Remove NMI context check
kprobes: Free kretprobe_instance with rcu callback
kprobes: Make local used functions static
[RFC] kprobes: Remove task scan for updating kretprobe_instance
Peter Zijlstra (6):
llist: Add nonatomic __llist_add()
sched: Fix try_invoke_on_locked_down_task() semantics
kprobes: Remove kretprobe hash
asm-generic/atomic: Add try_cmpxchg() fallbacks
freelist: Lock less freelist
kprobes: Replace rp->free_instance with freelist
arch/arc/kernel/kprobes.c | 54 ------
arch/arm/probes/kprobes/core.c | 78 ---------
arch/arm64/kernel/probes/kprobes.c | 78 ---------
arch/csky/kernel/probes/kprobes.c | 77 --------
arch/ia64/kernel/kprobes.c | 77 --------
arch/mips/kernel/kprobes.c | 54 ------
arch/parisc/kernel/kprobes.c | 76 --------
arch/powerpc/kernel/kprobes.c | 53 ------
arch/s390/kernel/kprobes.c | 79 ---------
arch/sh/kernel/kprobes.c | 58 ------
arch/sparc/kernel/kprobes.c | 51 ------
arch/x86/include/asm/atomic.h | 2
arch/x86/include/asm/atomic64_64.h | 2
arch/x86/include/asm/cmpxchg.h | 2
arch/x86/kernel/kprobes/core.c | 108 ------------
drivers/gpu/drm/i915/i915_request.c | 6 -
include/asm-generic/atomic-instrumented.h | 216 ++++++++++++++----------
include/linux/atomic-arch-fallback.h | 90 +++++++++-
include/linux/atomic-fallback.h | 90 +++++++++-
include/linux/freelist.h | 129 ++++++++++++++
include/linux/kprobes.h | 73 +++++---
include/linux/llist.h | 15 ++
include/linux/sched.h | 4
kernel/fork.c | 4
kernel/kprobes.c | 263 +++++++++++++----------------
kernel/sched/core.c | 9 -
kernel/trace/trace_kprobe.c | 3
scripts/atomic/gen-atomic-fallback.sh | 63 ++++++-
scripts/atomic/gen-atomic-instrumented.sh | 29 +++
29 files changed, 729 insertions(+), 1114 deletions(-)
create mode 100644 include/linux/freelist.h
--
Masami Hiramatsu (Linaro) <mhiramat@kernel.org>
next reply other threads:[~2020-08-28 12:26 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-28 12:26 Masami Hiramatsu [this message]
2020-08-28 12:26 ` [PATCH v4 01/23] kprobes: Add generic kretprobe trampoline handler Masami Hiramatsu
2020-08-28 12:27 ` [PATCH v4 02/23] x86/kprobes: Use " Masami Hiramatsu
2020-08-28 12:27 ` [PATCH v4 03/23] arm: kprobes: " Masami Hiramatsu
2020-08-28 12:27 ` [PATCH v4 04/23] arm64: " Masami Hiramatsu
2020-08-28 13:31 ` Mark Rutland
2020-08-28 13:37 ` peterz
2020-08-28 13:48 ` Mark Rutland
2020-08-28 13:58 ` Masami Hiramatsu
2020-08-28 12:27 ` [PATCH v4 05/23] arc: " Masami Hiramatsu
2020-08-28 12:27 ` [PATCH v4 06/23] csky: " Masami Hiramatsu
2020-08-28 12:27 ` [PATCH v4 07/23] ia64: " Masami Hiramatsu
2020-08-28 12:28 ` [PATCH v4 08/23] mips: " Masami Hiramatsu
2020-08-28 12:28 ` [PATCH v4 09/23] parisc: " Masami Hiramatsu
2020-08-28 12:28 ` [PATCH v4 10/23] powerpc: " Masami Hiramatsu
2020-08-28 12:28 ` [PATCH v4 11/23] s390: " Masami Hiramatsu
2020-08-28 12:28 ` [PATCH v4 12/23] sh: " Masami Hiramatsu
2020-08-28 12:29 ` [PATCH v4 13/23] sparc: " Masami Hiramatsu
2020-08-28 12:29 ` [PATCH v4 14/23] kprobes: Remove NMI context check Masami Hiramatsu
2020-08-28 12:29 ` [PATCH v4 15/23] kprobes: Free kretprobe_instance with rcu callback Masami Hiramatsu
2020-08-28 12:29 ` [PATCH v4 16/23] kprobes: Make local used functions static Masami Hiramatsu
2020-08-28 12:29 ` [PATCH v4 17/23] llist: Add nonatomic __llist_add() Masami Hiramatsu
2020-08-28 12:29 ` [PATCH v4 18/23] sched: Fix try_invoke_on_locked_down_task() semantics Masami Hiramatsu
2020-08-29 2:01 ` Masami Hiramatsu
2020-08-29 7:30 ` peterz
2020-08-29 17:31 ` Paul E. McKenney
2020-08-28 12:30 ` [PATCH v4 19/23] kprobes: Remove kretprobe hash Masami Hiramatsu
2020-08-28 18:37 ` Masami Hiramatsu
2020-08-28 19:02 ` peterz
2020-08-28 19:32 ` Eddy_Wu
2020-08-28 20:29 ` Peter Zijlstra
2020-08-29 1:23 ` Masami Hiramatsu
2020-08-28 12:30 ` [PATCH v4 20/23] [RFC] kprobes: Remove task scan for updating kretprobe_instance Masami Hiramatsu
2020-08-28 12:52 ` peterz
2020-08-28 15:10 ` Masami Hiramatsu
2020-08-28 15:18 ` peterz
2020-08-28 16:01 ` Masami Hiramatsu
2020-08-28 12:30 ` [PATCH v4 21/23] asm-generic/atomic: Add try_cmpxchg() fallbacks Masami Hiramatsu
2020-08-28 12:30 ` [PATCH v4 22/23] freelist: Lock less freelist Masami Hiramatsu
2020-08-28 12:30 ` [PATCH v4 23/23] kprobes: Replace rp->free_instance with freelist Masami Hiramatsu
2020-08-28 12:37 ` [PATCH v4 00/23] kprobes: Unify kretprobe trampoline handlers and make kretprobe lockless Masami Hiramatsu
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