linux-kernel - perf probe -L on ubuntu 16.04

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 16 May 2016 22:56:36 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Masami Hiramatsu <mhiramat@...nel.org>
Cc:	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: perf probe -L on ubuntu 16.04

Hi Masami,

	Have you ever tried using 'perf probe' on ubuntu?

acme@...ntu:~/git/linux$ sudo apt-cache search linux-image-$(uname -r)
linux-image-4.4.0-21-generic - Linux kernel image for version 4.4.0 on
64 bit x86 SMP
linux-image-4.4.0-21-generic-dbgsym - Linux kernel debug image for
version 4.4.0 on 64 bit x86 SMP
acme@...ntu:~/git/linux$ 
acme@...ntu:~/git/linux$ 

So those are installed, but then I try:

root@...ntu:~# perf probe -vvv -L getname_flags
Looking at the vmlinux_path (8 entries long)
Using /usr/lib/debug/boot/vmlinux-4.4.0-21-generic for symbols
Open Debuginfo file: /usr/lib/debug/boot/vmlinux-4.4.0-21-generic
fname: /build/linux-Ay7j_C/linux-4.4.0/fs/namei.c, lineno:125
New line range: 125 to 2147483647
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
path: /build/linux-Ay7j_C/linux-4.4.0/fs/namei.c
Failed to find source file path.
  Error: Failed to show lines. Reason: No such file or directory (Code: -2)
root@...ntu:~# 

Couldn't find the source code files, which is the case:

acme@...ntu:~/git/linux$ dpkg -L linux-image-$(uname -r)-dbgsym | grep
'\.c'
acme@...ntu:~/git/linux$ dpkg -L linux-image-$(uname -r)-dbgsym | grep
'\.ko' | tail -2
/usr/lib/debug/lib/modules/4.4.0-21-generic/kernel/crypto/pcbc.ko
/usr/lib/debug/lib/modules/4.4.0-21-generic/kernel/crypto/crc32.ko
acme@...ntu:~/git/linux$ 

Have to dig deeper to see where the source code is, ideas?

- Arnaldo