lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <20100722072044.GD27177@redhat.com>
Date:	Thu, 22 Jul 2010 10:20:44 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, peterz@...radead.org, paulus@...ba.org
Subject: perf annotate segfaults when source code has goto label that looks
 like hex number

The script below demonstrate this. The problem is in
hist_entry__parse_objdump_line():

        if (*tmp) {
                /*
                 * Parse hexa addresses followed by ':'
                 */
                line_ip = strtoull(tmp, &tmp2, 16);
                if (*tmp2 != ':' || tmp == tmp2)
                        line_ip = -1;
        }
 
strtoull() returns valid number when it gets line with label and following
test passes too. I can't think of a way to unambiguously distinguish between
label and valid rip. May be running objdump with --prefix-addresses will
help, but it may make other thing unambiguous.

=== script ===
cat > test.c << EOF
int main(int argc, char **argv)
{
	int i;

	while(1) {
		i++;
		if (i == 10000000)
			goto add;
	}
add:
	return 0;
}
EOF

gcc -g test.c
perf record ./a.out
perf annotate
--
			Gleb.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ