c - gdb ptrace operation not permitted -


i'm trying attach programme gdb returns me:

attaching process 29139 not attach process. if uid matches uid of target process, check setting of /proc/sys/kernel/yama/ptrace_scope, or try again root user. more details, see /etc/sysctl.d/10-ptrace.conf ptrace: operation not permitted.

edb-debugger returns "failed attach process, please check privileges , try again."

strace returns "attach: ptrace(ptrace_attach, ...): operation not permitted"

i changed "kernel.yama.ptrace_scope" 1 0 , "/proc/sys/kernel/yama/ptrace_scope" 1 0 , tried "set environment ld_preload=./ptrace.so" this:

#include <stdio.h> int ptrace(int i, int j, int k, int l) {     printf(" ptrace(%i, %i, %i, %i), returning -1\n", i, j, k, l);     return 0; }

but still returns same error. how can attach debuggers?

this due kernel hardening in linux; can disable behavior echo 0 > /proc/sys/kernel/yama/ptrace_scope or modifying in /etc/sysctl.d/10-ptrace.conf

see this article in fedora 22 (with links documentation) , this comment thread ubuntu , .


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