From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
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@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: https://lkml.kernel.org/n/tip-qagoy2dmbjpc9gdnaj0r3mml@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/util/annotate.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 3336cbc6ec48..1d4807c46efd 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1302,7 +1302,7 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil
int symbol__disassemble(struct symbol *sym, struct map *map, size_t privsize)
{
struct dso *dso = map->dso;
- char command[PATH_MAX * 2];
+ char *command;
FILE *file;
char symfs_filename[PATH_MAX];
struct kcore_extract kce;
@@ -1364,7 +1364,7 @@ int symbol__disassemble(struct symbol *sym, struct map *map, size_t privsize)
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",
@@ -1377,12 +1377,17 @@ int symbol__disassemble(struct symbol *sym, struct map *map, size_t privsize)
symbol_conf.annotate_src ? "-S" : "",
symfs_filename, symfs_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);
err = -1;
if (pipe(stdout_fd) < 0) {
pr_err("Failure creating the pipe to run %s\n", command);
- goto out_remove_tmp;
+ goto out_free_command;
}
pid = fork();
@@ -1409,7 +1414,7 @@ int symbol__disassemble(struct symbol *sym, struct map *map, size_t privsize)
* If we were using debug info should retry with
* original binary.
*/
- goto out_remove_tmp;
+ goto out_free_command;
}
nline = 0;
@@ -1432,6 +1437,8 @@ int symbol__disassemble(struct symbol *sym, struct map *map, size_t privsize)
fclose(file);
err = 0;
+out_free_command:
+ free(command);
out_remove_tmp:
close(stdout_fd[0]);
@@ -1445,7 +1452,7 @@ int symbol__disassemble(struct symbol *sym, struct map *map, size_t privsize)
out_close_stdout:
close(stdout_fd[1]);
- goto out_remove_tmp;
+ goto out_free_command;
}
static void insert_source_line(struct rb_root *root, struct source_line *src_line)
