Hi, Here is the 2nd version of the series to unify the kretprobe trampoline handler implementation across all architectures which are currently kprobes supported. Previous version is here; https://lkml.kernel.org/r/159844957216.510284.17683703701627367133.stgit@devnote2 This series removes the in_nmi() check from pre_kretprobe_handler() since we can avoid double-lock deadlock from NMI by kprobe_busy_begin/end(). In this version, I also add a patch to use kfree_rcu() for freeing kretprobe instance objects so that we don't call kfree() in NMI context directly. The unified generic kretprobe trampoline handler is based on x86 code, which already support frame-pointer checker. The checker is enabled on arm and arm64 too because I can test it. For other architecutres, currently the checker is not enabled. If someone wants to enable it, please set the correct frame pointer to ri->fp and pass it to kretprobe_trampoline_handler() as the 3rd parameter, instead of NULL. Thank you, --- Masami Hiramatsu (15): 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 arch/arc/kernel/kprobes.c | 55 +--------------- arch/arm/probes/kprobes/core.c | 79 +---------------------- arch/arm64/kernel/probes/kprobes.c | 79 +---------------------- arch/csky/kernel/probes/kprobes.c | 78 +--------------------- arch/ia64/kernel/kprobes.c | 79 +---------------------- arch/mips/kernel/kprobes.c | 55 +--------------- arch/parisc/kernel/kprobes.c | 78 ++-------------------- arch/powerpc/kernel/kprobes.c | 55 +--------------- arch/s390/kernel/kprobes.c | 81 +---------------------- arch/sh/kernel/kprobes.c | 59 +---------------- arch/sparc/kernel/kprobes.c | 52 +-------------- arch/x86/kernel/kprobes/core.c | 109 +------------------------------ include/linux/kprobes.h | 35 +++++++++- kernel/kprobes.c | 126 +++++++++++++++++++++++++++++------- 14 files changed, 182 insertions(+), 838 deletions(-) -- Masami Hiramatsu (Linaro) <mhiramat@xxxxxxxxxx>
