On 05/01, Jiri Olsa wrote:
>
> - added Oleg's Tested-by for signal related patches
See the test-case below. Without 1/4 + 2/4 it fails, it can
miss the 2nd bp or report the 1st one twice.
Jan, FYI.
Oleg.
#define _GNU_SOURCE 1
#include <stdio.h>
#include <unistd.h>
#include <sys/ptrace.h>
#include <sys/debugreg.h>
#include <sys/user.h>
#include <sys/wait.h>
#include <assert.h>
#include <assert.h>
#include <stddef.h>
#define DR_GLOBAL_ENABLE 0x2
#define DR_LOCAL_ENABLE 0x1
unsigned long encode_dr7(int drnum, int enable, unsigned int type, unsigned int
len)
{
unsigned long dr7;
dr7 = ((len | type) & 0xf)
<< (DR_CONTROL_SHIFT + drnum * DR_CONTROL_SIZE);
if (enable)
dr7 |= (DR_GLOBAL_ENABLE << (drnum * DR_ENABLE_SIZE));
return dr7;
}
int write_dr(int pid, int dr, unsigned long val)
{
return ptrace(PTRACE_POKEUSER, pid,
offsetof (struct user, u_debugreg[dr]),
val);
}
#define GET_REG(pid, reg) \
ptrace(PTRACE_PEEKUSER, (pid), \
offsetof(struct user, regs.reg), 0)
void *get_ip(int pid)
{
return (void*)GET_REG(pid, rip);
}
void func(void)
{
printf("bp_1 passed\n");
}
void sigh(int sig)
{
printf("bp_2 passed\n");
}
int main(void)
{
int pid, stat;
unsigned long dr7;
pid = fork();
if (!pid) {
assert(ptrace(PTRACE_TRACEME, 0,0,0) == 0);
kill(getpid(), SIGHUP);
signal(SIGINT, sigh);
func();
return 0x13;
}
assert(pid == waitpid(-1, &stat, 0));
assert(WSTOPSIG(stat) == SIGHUP);
assert(write_dr(pid, 0, (long)func) == 0);
assert(write_dr(pid, 1, (long)sigh) == 0);
dr7 = 0;
dr7 |= encode_dr7(0, 1, DR_RW_EXECUTE, DR_LEN_1);
dr7 |= encode_dr7(1, 1, DR_RW_EXECUTE, DR_LEN_1);
assert(write_dr(pid, 7, dr7) == 0);
assert(ptrace(PTRACE_CONT, pid, 0,0) == 0);
assert(pid == waitpid(-1, &stat, 0));
assert(WSTOPSIG(stat) == SIGTRAP);
assert(get_ip(pid) == func);
kill(pid, SIGINT);
assert(ptrace(PTRACE_CONT, pid, 0,0) == 0);
assert(pid == waitpid(-1, &stat, 0));
assert(WSTOPSIG(stat) == SIGINT);
assert(ptrace(PTRACE_CONT, pid, 0,SIGINT) == 0);
assert(pid == waitpid(-1, &stat, 0));
assert(WSTOPSIG(stat) == SIGTRAP);
assert(get_ip(pid) == sigh);
assert(ptrace(PTRACE_CONT, pid, 0,0) == 0);
assert(pid == waitpid(-1, &stat, 0));
assert(stat == 0x1300);
return 0;
}
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