Hi,
This is the 2nd version of the series to fix kprobes issues
on the kernel with CONFIG_RETPOLINE=y.
- [1/3]: This introduces __x86_indirect_thunk_* boundary
symbols so that kprobes easily identify those functions.
- [2/3]: Mark __x86_indirect_thunk_* as blacklisted function
for kprobes, since it can be called from other
blacklisted functions.
- [3/3]: Check jmp instructions in the probe target function
whether it jumps into the __x86_indirect_thunk_*,
because it is equal to an indirect jump instruction.
In this version, just [1/3] has been changed according to
David Woodhouse's comment.
[1/3]: Consolidate .text.__x86.indirect_thunk.* sections
to .text.__x86.indirect_thunk section.
Thank you,
---
Masami Hiramatsu (3):
retpoline: Introduce start/end markers of indirect thunk
kprobes/x86: Blacklist indirect thunk functions for kprobes
kprobes/x86: Disable optimizing on the function jumps to indirect thunk
arch/x86/include/asm/nospec-branch.h | 3 +++
arch/x86/kernel/kprobes/opt.c | 23 ++++++++++++++++++++++-
arch/x86/kernel/vmlinux.lds.S | 6 ++++++
arch/x86/lib/retpoline.S | 5 +++--
4 files changed, 34 insertions(+), 3 deletions(-)
--
Masami Hiramatsu (Linaro) <mhira...@kernel.org>
