On 11/28/2017 09:02 PM, Josef Bacik wrote: > On Tue, Nov 28, 2017 at 11:58:41AM -0700, Jonathan Corbet wrote: >> On Wed, 22 Nov 2017 16:23:30 -0500 >> Josef Bacik <josef@xxxxxxxxxxxxxx> wrote: >>> From: Josef Bacik <jbacik@xxxxxx> >>> >>> 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 <jbacik@xxxxxx> >>> Acked-by: Ingo Molnar <mingo@xxxxxxxxxx> >>> --- >>> 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 ... ? > > Well fuck, do you want me to send a increment Daniel/Alexei or resend this patch > fixed? Thanks, Sorry for late reply, please rebase + respin the whole series with this fixed. There were also few typos in the cover letter / commit messages that would be good to get fixed along the way. Also, could you debug why this wasn't caught at compile/runtime during testing? Thanks a lot, Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
