Numfor Mbiziwo-Tiapo 0a19fff567 perf header: Fix use of unitialized value warning ... [ Upstream commit 20f9781f49 ] When building our local version of perf with MSAN (Memory Sanitizer) and running the perf record command, MSAN throws a use of uninitialized value warning in "tools/perf/util/util.c:333:6". This warning stems from the "buf" variable being passed into "write". It originated as the variable "ev" with the type union perf_event* defined in the "perf_event__synthesize_attr" function in "tools/perf/util/header.c". In the "perf_event__synthesize_attr" function they allocate space with a malloc call using ev, then go on to only assign some of the member variables before passing "ev" on as a parameter to the "process" function therefore "ev" contains uninitialized memory. Changing the malloc call to zalloc to initialize all the members of "ev" which gets rid of the warning. To reproduce this warning, build perf by running: make -C tools/perf CLANG=1 CC=clang EXTRA_CFLAGS="-fsanitize=memory\ -fsanitize-memory-track-origins" (Additionally, llvm might have to be installed and clang might have to be specified as the compiler - export CC=/usr/bin/clang) then running: tools/perf/perf record -o - ls / | tools/perf/perf --no-pager annotate\ -i - --stdio Please see the cover letter for why false positive warnings may be generated. Signed-off-by: Numfor Mbiziwo-Tiapo <nums@google.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mark Drayton <mbd@fb.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Song Liu <songliubraving@fb.com> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/20190724234500.253358-2-nums@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2019-08-25 10:47:53 +02:00
..
accounting
arch	jump_label: move 'asm goto' support test to Kconfig	2019-06-04 08:02:34 +02:00
bpf	tools: bpftool: Fix json dump crash on powerpc	2019-07-26 09:14:16 +02:00
build	perf build: Don't unconditionally link the libbfd feature test to -liberty and -lz	2019-02-12 19:47:16 +01:00
cgroup
firewire
gpio
hv	Tools: hv: kvp: Fix a warning of buffer overflow with gcc 8.0.1	2019-02-12 19:46:59 +01:00
iio	iio: iio-utils: Fix possible incorrect mask calculation	2019-07-31 07:27:02 +02:00
include	bpf: fix uapi bpf_prog_info fields alignment	2019-07-26 09:14:15 +02:00
kvm/kvm_stat	tools/kvm_stat: fix fields filter for child events	2019-06-19 08:18:05 +02:00
laptop
leds
lib	bpf, libbpf, smatch: Fix potential NULL pointer dereference	2019-07-26 09:14:15 +02:00
memory-model	tools/memory-model: Rename litmus tests to comply to norm7	2018-07-17 09:30:36 +02:00
nfsd
objtool	objtool: Support GCC 9 cold subfunction naming scheme	2019-08-06 19:06:57 +02:00
pci	tools: PCI: Add MSI-X support	2018-07-19 11:47:13 +01:00
pcmcia
perf	perf header: Fix use of unitialized value warning	2019-08-25 10:47:53 +02:00
power	cpupower : frequency-set -r option misses the last cpu in related cpu list	2019-07-26 09:14:03 +02:00
scripts
spi
testing	cgroup: kselftest: relax fs_spec checks	2019-08-06 19:06:55 +02:00
thermal/tmon
time
usb	usbip: fix vhci_hcd controller counting	2019-04-20 09:16:01 +02:00
virtio	virtio: fix test build after uio.h change	2019-01-13 09:51:03 +01:00
vm	tools/vm/page-types.c: fix "defined but not used" warning	2018-09-04 16:45:02 -07:00
wmi
Makefile