[PATCH v2 0/4] Make fprobe + rethook immune to recursion

Ze Gao
2023-05-16T07:18:55Z

Hi all,

This is the 2nd version of patch series to fix the ftrace rethook recursion problem.

v1: https://lore.kernel.org/linux-trace-kernel/cover.1684120990.git.zegao@tencent.com/T/ +++#md4c0bae6a6cae28dadf2a2c6105ff140b35fddea

As Steven suggested, this version removes unnecessary notrace annotations from fprobe
and rethook functions from v1 [PATCH 2,3,4/4] and replaces with makefile changes to filter
out compiler flags which ftrace depends upon for rethook related objects.

Ze Gao (4):
rethook: use preempt_{disable, enable}_notrace in
rethook_trampoline_handler
fprobe: make fprobe_kprobe_handler recursion free
fprobe: add recursion detection in fprobe_exit_handler
rehook, fprobe: do not trace rethook related functions

arch/riscv/kernel/probes/Makefile | 2 +
arch/s390/kernel/Makefile | 1 +
arch/x86/kernel/Makefile | 1 +
kernel/trace/fprobe.c | 72 ++++++++++++++++++++++++-------
kernel/trace/rethook.c | 4 +-
5 files changed, 63 insertions(+), 17 deletions(-)

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2.40.1