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Steven Rostedt (VMware) 32843735f3 tracing/kprobes: Have uname use __get_str() in print_fmt 
commit 20279420ae upstream.

Thomas Richter reported:

> Test case 66 'Use vfs_getname probe to get syscall args filenames'
> is broken on s390, but works on x86. The test case fails with:
>
>  [root@m35lp76 perf]# perf test -F 66
>  66: Use vfs_getname probe to get syscall args filenames
>            :Recording open file:
>  [ perf record: Woken up 1 times to write data ]
>  [ perf record: Captured and wrote 0.004 MB /tmp/__perf_test.perf.data.TCdYj\
> 	 (20 samples) ]
>  Looking at perf.data file for vfs_getname records for the file we touched:
>   FAILED!
>   [root@m35lp76 perf]#

The root cause was the print_fmt of the kprobe event that referenced the
"ustring"

> Setting up the kprobe event using perf command:
>
>  # ./perf probe "vfs_getname=getname_flags:72 pathname=filename:ustring"
>
> generates this format file:
>   [root@m35lp76 perf]# cat /sys/kernel/debug/tracing/events/probe/\
> 	  vfs_getname/format
>   name: vfs_getname
>   ID: 1172
>   format:
>     field:unsigned short common_type; offset:0; size:2; signed:0;
>     field:unsigned char common_flags; offset:2; size:1; signed:0;
>     field:unsigned char common_preempt_count; offset:3; size:1; signed:0;
>     field:int common_pid; offset:4; size:4; signed:1;
>
>     field:unsigned long __probe_ip; offset:8; size:8; signed:0;
>     field:__data_loc char[] pathname; offset:16; size:4; signed:1;
>
>     print fmt: "(%lx) pathname=\"%s\"", REC->__probe_ip, REC->pathname

Instead of using "__get_str(pathname)" it referenced it directly.

Link: http://lkml.kernel.org/r/20200124100742.4050c15e@gandalf.local.home

Cc: stable@vger.kernel.org
Fixes: 88903c4643 ("tracing/probe: Add ustring type for user-space string")
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Reported-by: Thomas Richter <tmricht@linux.ibm.com>
Tested-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2020-02-11 04:36:39 -08:00
arch sparc32: fix struct ipc64_perm type definition 2020-02-11 04:36:34 -08:00
block block: allow partitions on host aware zone devices 2020-01-26 09:59:08 -07:00
certs certs: Add wrapper function to check blacklisted binary hash 2019-11-12 12:25:50 +11:00
crypto crypto: pcrypt - Fix user-after-free on module unload 2020-02-01 09:33:00 +00:00
Documentation PM / devfreq: Add new name attribute for sysfs 2020-02-04 18:18:01 +00:00
drivers mfd: dln2: More sanity checking for endpoints 2020-02-11 04:36:38 -08:00
fs btrfs: do not zero f_bavail if we have available space 2020-02-04 18:18:03 +00:00
include udp: segment looped gso packets correctly 2020-02-01 09:32:58 +00:00
init Revert "um: Enable CONFIG_CONSTRUCTORS" 2020-02-01 09:33:00 +00:00
ipc ipc/msg.c: consolidate all xxxctl_down() functions 2020-02-11 04:36:39 -08:00
kernel tracing/kprobes: Have uname use __get_str() in print_fmt 2020-02-11 04:36:39 -08:00
lib lib/test_bitmap: correct test data offsets for 32-bit 2020-02-04 18:18:01 +00:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
mm mm/mempolicy.c: fix out of bounds write in mpol_parse_str() 2020-02-04 18:18:01 +00:00
net netfilter: ipset: fix suspicious RCU usage in find_set_and_id 2020-02-11 04:36:39 -08:00
samples samples/seccomp: Zero out members based on seccomp_notif_sizes 2020-01-02 13:03:39 -08:00
scripts ARM fixes for 5.5: 2020-01-25 14:32:51 -08:00
security tomoyo: Use atomic_t for statistics counter 2020-02-04 18:18:02 +00:00
sound ALSA: pcm: Fix memory leak at closing a stream without hw_free 2020-02-11 04:36:39 -08:00
tools tools lib: Fix builds when glibc contains strlcpy() 2020-02-04 18:18:01 +00:00
usr gen_initramfs_list.sh: fix 'bad variable name' error 2020-01-04 00:00:48 +09:00
virt PPC KVM fix for 5.5 2019-12-22 13:18:15 +01:00
.clang-format clang-format: Update with the latest for_each macro list 2019-08-31 10:00:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore modpost: dump missing namespaces into a single modules.nsdeps file 2019-11-11 20:10:01 +09:00
.mailmap MAINTAINERS: update my email address 2020-01-11 14:33:39 -08:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS Linux 5.4-rc4 2019-10-29 04:43:29 -06:00
Kbuild kbuild: do not descend to ./Kbuild when cleaning 2019-08-21 21:03:58 +09:00
Kconfig docs: kbuild: convert docs to ReST and rename to *.rst 2019-06-14 14:21:21 -06:00
MAINTAINERS MAINTAINERS: correct entries for ISDN/mISDN section 2020-02-11 04:36:38 -08:00
Makefile Linux 5.5.2 2020-02-04 18:18:03 +00:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.