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Alexander Shishkin 00496fe5e0 perf/aux: Fix the aux_output group inheritance fix 
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  f733c6b508 ("perf/core: Fix inheritance of aux_output groups")

adds a NULL pointer dereference in case inherit_group() races with
perf_release(), which causes the below crash:

 > BUG: kernel NULL pointer dereference, address: 000000000000010b
 > #PF: supervisor read access in kernel mode
 > #PF: error_code(0x0000) - not-present page
 > PGD 3b203b067 P4D 3b203b067 PUD 3b2040067 PMD 0
 > Oops: 0000 [#1] SMP KASAN
 > CPU: 0 PID: 315 Comm: exclusive-group Tainted: G B 5.4.0-rc3-00181-g72e1839403cb-dirty #878
 > RIP: 0010:perf_get_aux_event+0x86/0x270
 > Call Trace:
 >  ? __perf_read_group_add+0x3b0/0x3b0
 >  ? __kasan_check_write+0x14/0x20
 >  ? __perf_event_init_context+0x154/0x170
 >  inherit_task_group.isra.0.part.0+0x14b/0x170
 >  perf_event_init_task+0x296/0x4b0

Fix this by skipping over events that are getting closed, in the
inheritance path.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Fixes: f733c6b508 ("perf/core: Fix inheritance of aux_output groups")
Link: https://lkml.kernel.org/r/20191101151248.47327-1-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-11-13 08:16:40 +01:00
arch perf/x86/uncore: Fix event group support 2019-10-28 11:02:01 +01:00
block
certs
crypto
Documentation
drivers Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-10-27 06:55:55 -04:00
fs Seven cifs/smb3 fixes, including three for stable 2019-10-27 06:41:52 -04:00
include perf/headers: Fix spelling s/EACCESS/EACCES/, s/privilidge/privilege/ 2019-10-28 11:02:01 +01:00
init
ipc
kernel perf/aux: Fix the aux_output group inheritance fix 2019-11-13 08:16:40 +01:00
lib
LICENSES
mm
net
samples
scripts
security
sound
tools perf tools: Fix time sorting 2019-11-05 08:49:14 -03:00
usr
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.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
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.mailmap A few MIPS fixes: 2019-10-26 19:43:12 -04:00
COPYING
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Kbuild
Kconfig
MAINTAINERS A few MIPS fixes: 2019-10-26 19:43:12 -04:00
Makefile Linux 5.4-rc5 2019-10-27 13:19:19 -04:00
README

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.