* [PATCH for 4.4.y 1/5] perf probe: Fix to check blacklist address correctly
2020-07-02 12:41 [PATCH for 4.4.y 0/5] tools/perf: Backport fixes for 4.4 for newer toolchain Masami Hiramatsu
@ 2020-07-02 12:41 ` Masami Hiramatsu
2020-07-02 12:41 ` [PATCH for 4.4.y 2/5] perf annotate: Use asprintf when formatting objdump command line Masami Hiramatsu
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Masami Hiramatsu @ 2020-07-02 12:41 UTC (permalink / raw)
To: stable
Cc: Sergey Senozhatsky, Changbin Du, Jiri Olsa,
Arnaldo Carvalho de Melo, mhiramat
commit 80526491c2ca6abc028c0f0dbb0707a1f35fb18a upstream.
Fix to check kprobe blacklist address correctly with relocated address
by adjusting debuginfo address.
Since the address in the debuginfo is same as objdump, it is different
from relocated kernel address with KASLR. Thus, 'perf probe' always
misses to catch the blacklisted addresses.
Without this patch, 'perf probe' can not detect the blacklist addresses
on a KASLR enabled kernel.
# perf probe kprobe_dispatcher
Failed to write event: Invalid argument
Error: Failed to add events.
#
With this patch, it correctly shows the error message.
# perf probe kprobe_dispatcher
kprobe_dispatcher is blacklisted function, skip it.
Probe point 'kprobe_dispatcher' not found.
Error: Failed to add events.
#
Fixes: 9aaf5a5f479b ("perf probe: Check kprobes blacklist when adding new events")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: stable@vger.kernel.org
Link: http://lore.kernel.org/lkml/158763966411.30755.5882376357738273695.stgit@devnote2
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/probe-event.c | 21 +++++++++++++++------
1 file changed, 15 insertions(+), 6 deletions(-)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 0195b7e8c54a..4f05424096b6 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -122,7 +122,7 @@ static struct symbol *__find_kernel_function(u64 addr, struct map **mapp)
return machine__find_kernel_function(host_machine, addr, mapp, NULL);
}
-static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void)
+static struct ref_reloc_sym *kernel_get_ref_reloc_sym(struct map **pmap)
{
/* kmap->ref_reloc_sym should be set if host_machine is initialized */
struct kmap *kmap;
@@ -134,6 +134,10 @@ static struct ref_reloc_sym *kernel_get_ref_reloc_sym(void)
kmap = map__kmap(map);
if (!kmap)
return NULL;
+
+ if (pmap)
+ *pmap = map;
+
return kmap->ref_reloc_sym;
}
@@ -145,7 +149,7 @@ static int kernel_get_symbol_address_by_name(const char *name, u64 *addr,
struct map *map;
/* ref_reloc_sym is just a label. Need a special fix*/
- reloc_sym = kernel_get_ref_reloc_sym();
+ reloc_sym = kernel_get_ref_reloc_sym(NULL);
if (reloc_sym && strcmp(name, reloc_sym->name) == 0)
*addr = (reloc) ? reloc_sym->addr : reloc_sym->unrelocated_addr;
else {
@@ -618,6 +622,7 @@ static int post_process_probe_trace_events(struct probe_trace_event *tevs,
bool uprobe)
{
struct ref_reloc_sym *reloc_sym;
+ struct map *map;
char *tmp;
int i, skipped = 0;
@@ -628,7 +633,7 @@ static int post_process_probe_trace_events(struct probe_trace_event *tevs,
if (module)
return add_module_to_probe_trace_events(tevs, ntevs, module);
- reloc_sym = kernel_get_ref_reloc_sym();
+ reloc_sym = kernel_get_ref_reloc_sym(&map);
if (!reloc_sym) {
pr_warning("Relocated base symbol is not found!\n");
return -EINVAL;
@@ -637,9 +642,13 @@ static int post_process_probe_trace_events(struct probe_trace_event *tevs,
for (i = 0; i < ntevs; i++) {
if (!tevs[i].point.address || tevs[i].point.retprobe)
continue;
- /* If we found a wrong one, mark it by NULL symbol */
+ /*
+ * If we found a wrong one, mark it by NULL symbol.
+ * Since addresses in debuginfo is same as objdump, we need
+ * to convert it to addresses on memory.
+ */
if (kprobe_warn_out_range(tevs[i].point.symbol,
- tevs[i].point.address)) {
+ map__objdump_2mem(map, tevs[i].point.address))) {
tmp = NULL;
skipped++;
} else {
@@ -2553,7 +2562,7 @@ static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
/* Note that the symbols in the kmodule are not relocated */
if (!pev->uprobes && !pp->retprobe && !pev->target) {
- reloc_sym = kernel_get_ref_reloc_sym();
+ reloc_sym = kernel_get_ref_reloc_sym(NULL);
if (!reloc_sym) {
pr_warning("Relocated base symbol is not found!\n");
ret = -EINVAL;
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH for 4.4.y 2/5] perf annotate: Use asprintf when formatting objdump command line
2020-07-02 12:41 [PATCH for 4.4.y 0/5] tools/perf: Backport fixes for 4.4 for newer toolchain Masami Hiramatsu
2020-07-02 12:41 ` [PATCH for 4.4.y 1/5] perf probe: Fix to check blacklist address correctly Masami Hiramatsu
@ 2020-07-02 12:41 ` Masami Hiramatsu
2020-07-02 12:42 ` [PATCH for 4.4.y 3/5] perf tools: Fix snprint warnings for gcc 8 Masami Hiramatsu
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Masami Hiramatsu @ 2020-07-02 12:41 UTC (permalink / raw)
To: stable
Cc: Sergey Senozhatsky, Changbin Du, Jiri Olsa,
Arnaldo Carvalho de Melo, mhiramat
From: Arnaldo Carvalho de Melo <acme@redhat.com>
commit 6810158d526e483868e519befff407b91e76b3db upstream.
We were using a local buffer with an arbitrary size, that would have to
get increased to avoid truncation as warned by gcc 8:
util/annotate.c: In function 'symbol__disassemble':
util/annotate.c:1488:4: error: '%s' directive output may be truncated writing up to 4095 bytes into a region of size between 3966 and 8086 [-Werror=format-truncation=]
"%s %s%s --start-address=0x%016" PRIx64
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
util/annotate.c:1498:20:
symfs_filename, symfs_filename);
~~~~~~~~~~~~~~
util/annotate.c:1490:50: note: format string is defined here
" -l -d %s %s -C \"%s\" 2>/dev/null|grep -v \"%s:\"|expand",
^~
In file included from /usr/include/stdio.h:861,
from util/color.h:5,
from util/sort.h:8,
from util/annotate.c:14:
/usr/include/bits/stdio2.h:67:10: note: '__builtin___snprintf_chk' output 116 or more bytes (assuming 8331) into a destination of size 8192
return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
__bos (__s), __fmt, __va_arg_pack ());
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
So switch to asprintf, that will make sure enough space is available.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-qagoy2dmbjpc9gdnaj0r3mml@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/annotate.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 1dd1949b0e79..1e1c37a17355 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1077,7 +1077,7 @@ int symbol__annotate(struct symbol *sym, struct map *map, size_t privsize)
struct dso *dso = map->dso;
char *filename = dso__build_id_filename(dso, NULL, 0);
bool free_filename = true;
- char command[PATH_MAX * 2];
+ char *command;
FILE *file;
int err = 0;
char symfs_filename[PATH_MAX];
@@ -1192,7 +1192,7 @@ fallback:
strcpy(symfs_filename, tmp);
}
- snprintf(command, sizeof(command),
+ err = asprintf(&command,
"%s %s%s --start-address=0x%016" PRIx64
" --stop-address=0x%016" PRIx64
" -l -d %s %s -C %s 2>/dev/null|grep -v %s|expand",
@@ -1205,6 +1205,11 @@ fallback:
symbol_conf.annotate_src ? "-S" : "",
symfs_filename, filename);
+ if (err < 0) {
+ pr_err("Failure allocating memory for the command to run\n");
+ goto out_remove_tmp;
+ }
+
pr_debug("Executing: %s\n", command);
file = popen(command, "r");
@@ -1214,7 +1219,7 @@ fallback:
* If we were using debug info should retry with
* original binary.
*/
- goto out_remove_tmp;
+ goto out_free_command;
}
nline = 0;
@@ -1237,6 +1242,9 @@ fallback:
pclose(file);
+out_free_command:
+ free(command);
+
out_remove_tmp:
if (dso__needs_decompress(dso))
unlink(symfs_filename);
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH for 4.4.y 3/5] perf tools: Fix snprint warnings for gcc 8
2020-07-02 12:41 [PATCH for 4.4.y 0/5] tools/perf: Backport fixes for 4.4 for newer toolchain Masami Hiramatsu
2020-07-02 12:41 ` [PATCH for 4.4.y 1/5] perf probe: Fix to check blacklist address correctly Masami Hiramatsu
2020-07-02 12:41 ` [PATCH for 4.4.y 2/5] perf annotate: Use asprintf when formatting objdump command line Masami Hiramatsu
@ 2020-07-02 12:42 ` Masami Hiramatsu
2020-07-02 12:42 ` [PATCH for 4.4.y 4/5] perf: Make perf able to build with latest libbfd Masami Hiramatsu
2020-07-02 12:42 ` [PATCH for 4.4.y 5/5] tools/lib/subcmd/pager.c: do not alias select() params Masami Hiramatsu
4 siblings, 0 replies; 6+ messages in thread
From: Masami Hiramatsu @ 2020-07-02 12:42 UTC (permalink / raw)
To: stable
Cc: Sergey Senozhatsky, Changbin Du, Jiri Olsa,
Arnaldo Carvalho de Melo, mhiramat
From: Jiri Olsa <jolsa@kernel.org>
commit 77f18153c080855e1c3fb520ca31a4e61530121d upstream.
[Add an additional sprintf replacement in tools/perf/builtin-script.c]
With gcc 8 we get new set of snprintf() warnings that breaks the
compilation, one example:
tests/mem.c: In function ‘check’:
tests/mem.c:19:48: error: ‘%s’ directive output may be truncated writing \
up to 99 bytes into a region of size 89 [-Werror=format-truncation=]
snprintf(failure, sizeof failure, "unexpected %s", out);
The gcc docs says:
To avoid the warning either use a bigger buffer or handle the
function's return value which indicates whether or not its output
has been truncated.
Given that all these warnings are harmless, because the code either
properly fails due to uncomplete file path or we don't care for
truncated output at all, I'm changing all those snprintf() calls to
scnprintf(), which actually 'checks' for the snprint return value so the
gcc stays silent.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Link: http://lkml.kernel.org/r/20180319082902.4518-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-script.c | 24 ++++++++++++------------
tools/perf/tests/attr.c | 4 ++--
tools/perf/tests/pmu.c | 2 +-
tools/perf/util/cgroup.c | 2 +-
tools/perf/util/parse-events.c | 4 ++--
tools/perf/util/pmu.c | 2 +-
6 files changed, 19 insertions(+), 19 deletions(-)
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 20f0e27918dd..acd460303d1a 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1245,7 +1245,7 @@ static int is_directory(const char *base_path, const struct dirent *dent)
char path[PATH_MAX];
struct stat st;
- sprintf(path, "%s/%s", base_path, dent->d_name);
+ scnprintf(path, PATH_MAX, "%s/%s", base_path, dent->d_name);
if (stat(path, &st))
return 0;
@@ -1426,8 +1426,8 @@ static int list_available_scripts(const struct option *opt __maybe_unused,
return -1;
for_each_lang(scripts_path, scripts_dir, lang_dirent) {
- snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
- lang_dirent->d_name);
+ scnprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
+ lang_dirent->d_name);
lang_dir = opendir(lang_path);
if (!lang_dir)
continue;
@@ -1436,8 +1436,8 @@ static int list_available_scripts(const struct option *opt __maybe_unused,
script_root = get_script_root(script_dirent, REPORT_SUFFIX);
if (script_root) {
desc = script_desc__findnew(script_root);
- snprintf(script_path, MAXPATHLEN, "%s/%s",
- lang_path, script_dirent->d_name);
+ scnprintf(script_path, MAXPATHLEN, "%s/%s",
+ lang_path, script_dirent->d_name);
read_script_info(desc, script_path);
free(script_root);
}
@@ -1473,7 +1473,7 @@ static int check_ev_match(char *dir_name, char *scriptname,
int match, len;
FILE *fp;
- sprintf(filename, "%s/bin/%s-record", dir_name, scriptname);
+ scnprintf(filename, MAXPATHLEN, "%s/bin/%s-record", dir_name, scriptname);
fp = fopen(filename, "r");
if (!fp)
@@ -1549,8 +1549,8 @@ int find_scripts(char **scripts_array, char **scripts_path_array)
}
for_each_lang(scripts_path, scripts_dir, lang_dirent) {
- snprintf(lang_path, MAXPATHLEN, "%s/%s", scripts_path,
- lang_dirent->d_name);
+ scnprintf(lang_path, MAXPATHLEN, "%s/%s", scripts_path,
+ lang_dirent->d_name);
#ifdef NO_LIBPERL
if (strstr(lang_path, "perl"))
continue;
@@ -1605,8 +1605,8 @@ static char *get_script_path(const char *script_root, const char *suffix)
return NULL;
for_each_lang(scripts_path, scripts_dir, lang_dirent) {
- snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
- lang_dirent->d_name);
+ scnprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
+ lang_dirent->d_name);
lang_dir = opendir(lang_path);
if (!lang_dir)
continue;
@@ -1617,8 +1617,8 @@ static char *get_script_path(const char *script_root, const char *suffix)
free(__script_root);
closedir(lang_dir);
closedir(scripts_dir);
- snprintf(script_path, MAXPATHLEN, "%s/%s",
- lang_path, script_dirent->d_name);
+ scnprintf(script_path, MAXPATHLEN, "%s/%s",
+ lang_path, script_dirent->d_name);
return strdup(script_path);
}
free(__script_root);
diff --git a/tools/perf/tests/attr.c b/tools/perf/tests/attr.c
index 79547c225c14..9c81fbfb16d2 100644
--- a/tools/perf/tests/attr.c
+++ b/tools/perf/tests/attr.c
@@ -147,8 +147,8 @@ static int run_dir(const char *d, const char *perf)
if (verbose)
vcnt++;
- snprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",
- d, d, perf, vcnt, v);
+ scnprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",
+ d, d, perf, vcnt, v);
return system(cmd) ? TEST_FAIL : TEST_OK;
}
diff --git a/tools/perf/tests/pmu.c b/tools/perf/tests/pmu.c
index faa04e9d5d5f..b776831ceeea 100644
--- a/tools/perf/tests/pmu.c
+++ b/tools/perf/tests/pmu.c
@@ -95,7 +95,7 @@ static char *test_format_dir_get(void)
struct test_format *format = &test_formats[i];
FILE *file;
- snprintf(name, PATH_MAX, "%s/%s", dir, format->name);
+ scnprintf(name, PATH_MAX, "%s/%s", dir, format->name);
file = fopen(name, "w");
if (!file)
diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
index 32e12ecfe9c5..a32f0b34e3ed 100644
--- a/tools/perf/util/cgroup.c
+++ b/tools/perf/util/cgroup.c
@@ -64,7 +64,7 @@ static int open_cgroup(char *name)
if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1))
return -1;
- snprintf(path, PATH_MAX, "%s/%s", mnt, name);
+ scnprintf(path, PATH_MAX, "%s/%s", mnt, name);
fd = open(path, O_RDONLY);
if (fd == -1)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 9351738df703..849ad278dd5d 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -194,8 +194,8 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config)
for_each_event(sys_dirent, evt_dir, evt_dirent) {
- snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
- evt_dirent->d_name);
+ scnprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
+ evt_dirent->d_name);
fd = open(evt_path, O_RDONLY);
if (fd < 0)
continue;
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 4f650ebd564a..5245fbd09106 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -302,7 +302,7 @@ static int pmu_aliases_parse(char *dir, struct list_head *head)
if (pmu_alias_info_file(name))
continue;
- snprintf(path, PATH_MAX, "%s/%s", dir, name);
+ scnprintf(path, PATH_MAX, "%s/%s", dir, name);
file = fopen(path, "r");
if (!file) {
^ permalink raw reply related [flat|nested] 6+ messages in thread