Messages in this thread | | | Date | Fri, 20 Feb 2015 11:26:25 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH 1/2] kprobes/x86: Use 5-byte NOP when the code might be modified by ftrace |
| |
* Petr Mladek <pmladek@suse.cz> wrote:
> can_probe() checks if the given address points to the > beginning of an instruction. It analyzes all the > instructions from the beginning of the function until the > given address. The code might be modified by another > Kprobe. In this case, the current code is read into a > buffer, int3 breakpoint is replaced by the saved opcode > in the buffer, and can_probe() analyzes the buffer > instead. > > [...]
Had to drop this patch due to build failures on 32-bit x86:
arch/x86/kernel/kprobes/core.c:258:40: error: ‘MCOUNT_INSN_SIZE’ undeclared (first use in this function)
Thanks,
Ingo
| |