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Subject[PATCH 4.14 27/45] perf annotate: Use asprintf when formatting objdump command line
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

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>
Cc: Ignat Korchagin <ignat@cloudflare.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
tools/perf/util/annotate.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)

--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1432,7 +1432,7 @@ int symbol__disassemble(struct symbol *s
struct arch **parch, char *cpuid)
{
struct dso *dso = map->dso;
- char command[PATH_MAX * 2];
+ char *command;
struct arch *arch = NULL;
FILE *file;
char symfs_filename[PATH_MAX];
@@ -1496,7 +1496,7 @@ int symbol__disassemble(struct symbol *s
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",
@@ -1509,12 +1509,17 @@ int symbol__disassemble(struct symbol *s
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();
@@ -1541,7 +1546,7 @@ int symbol__disassemble(struct symbol *s
* If we were using debug info should retry with
* original binary.
*/
- goto out_remove_tmp;
+ goto out_free_command;
}

nline = 0;
@@ -1570,6 +1575,8 @@ int symbol__disassemble(struct symbol *s

fclose(file);
err = 0;
+out_free_command:
+ free(command);
out_remove_tmp:
close(stdout_fd[0]);

@@ -1583,7 +1590,7 @@ out:

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)

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