On Wed, 22 Nov 2017 16:23:30 -0500 Josef Bacik <jo...@toxicpanda.com> wrote:
> From: Josef Bacik <jba...@fb.com> > > Using BPF we can override kprob'ed functions and return arbitrary > values. Obviously this can be a bit unsafe, so make this feature opt-in > for functions. Simply tag a function with KPROBE_ERROR_INJECT_SYMBOL in > order to give BPF access to that function for error injection purposes. > > Signed-off-by: Josef Bacik <jba...@fb.com> > Acked-by: Ingo Molnar <mi...@kernel.org> > --- > arch/x86/include/asm/asm.h | 6 ++ > include/asm-generic/vmlinux.lds.h | 10 +++ > include/linux/bpf.h | 11 +++ > include/linux/kprobes.h | 1 + > include/linux/module.h | 5 ++ > kernel/kprobes.c | 163 > ++++++++++++++++++++++++++++++++++++++ > kernel/module.c | 6 +- > 7 files changed, 201 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h > index b0dc91f4bedc..340f4cc43255 100644 > --- a/arch/x86/include/asm/asm.h > +++ b/arch/x86/include/asm/asm.h > @@ -85,6 +85,12 @@ > _ASM_PTR (entry); \ > .popsection > > +# define _ASM_KPROBE_ERROR_INJECT(entry) \ > + .pushsection "_kprobe_error_inject_list","aw" ; \ > + _ASM_ALIGN ; \ > + _ASM_PTR (entry); \ > + .popseciton So this stuff is not my area of greatest expertise, but I do have to wonder how ".popseciton" can work ... ? Thanks, jon
