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perf tools: Fix compilation errors on gcc8

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We are getting following warnings on gcc8 that break compilation:

  $ make
    CC       jvmti/jvmti_agent.o
  jvmti/jvmti_agent.c: In function ‘jvmti_open’:
  jvmti/jvmti_agent.c:252:35: error: ‘/jit-’ directive output may be truncated \
    writing 5 bytes into a region of size between 1 and 4096 [-Werror=format-truncation=]
    snprintf(dump_path, PATH_MAX, "%s/jit-%i.dump", jit_path, getpid());

There's no point in checking the result of snprintf call in
jvmti_open, the following open call will fail in case the
name is mangled or too long.

Using tools/lib/ function scnprintf that touches the return value from
the snprintf() calls and thus get rid of those warnings.

  $ make DEBUG=1
    CC       arch/x86/util/perf_regs.o
  arch/x86/util/perf_regs.c: In function ‘arch_sdt_arg_parse_op’:
  arch/x86/util/perf_regs.c:229:4: error: ‘strncpy’ output truncated before terminating nul
  copying 2 bytes from a string of the same length [-Werror=stringop-truncation]
    strncpy(prefix, "+0", 2);
    ^~~~~~~~~~~~~~~~~~~~~~~~

Using scnprintf instead of the strncpy (which we know is safe in here)
to get rid of that warning.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180702134202.17745-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2018-07-02 15:42:01 +02:00 committed by Arnaldo Carvalho de Melo
parent db8fec583f
commit a09603f851
2 changed files with 3 additions and 2 deletions
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2
tools/perf/arch/x86/util/perf_regs.c
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@ -226,7 +226,7 @@ int arch_sdt_arg_parse_op(char *old_op, char **new_op)
else if (rm[2].rm_so != rm[2].rm_eo)
prefix[0] = '+';
else
strncpy(prefix, "+0", 2);
scnprintf(prefix, sizeof(prefix), "+0");
}
/* Rename register */

3
tools/perf/jvmti/jvmti_agent.c
View File

@ -35,6 +35,7 @@
#include <sys/mman.h>
#include <syscall.h> /* for gettid() */
#include <err.h>
#include <linux/kernel.h>
#include "jvmti_agent.h"
#include "../util/jitdump.h"
@ -249,7 +250,7 @@ void *jvmti_open(void)
/*
* jitdump file name
*/
snprintf(dump_path, PATH_MAX, "%s/jit-%i.dump", jit_path, getpid());
scnprintf(dump_path, PATH_MAX, "%s/jit-%i.dump", jit_path, getpid());
fd = open(dump_path, O_CREAT|O_TRUNC|O_RDWR, 0666);
if (fd == -1)