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tools: bpftool: Fix json dump crash on powerpc

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Michael reported crash with by bpf program in json mode on powerpc:

  # bpftool prog -p dump jited id 14
  [{
        "name": "0xd00000000a9aa760",
        "insns": [{
                "pc": "0x0",
                "operation": "nop",
                "operands": [null
                ]
            },{
                "pc": "0x4",
                "operation": "nop",
                "operands": [null
                ]
            },{
                "pc": "0x8",
                "operation": "mflr",
  Segmentation fault (core dumped)

The code is assuming char pointers in format, which is not always
true at least for powerpc. Fixing this by dumping the whole string
into buffer based on its format.

Please note that libopcodes code does not check return values from
fprintf callback, but as per Jakub suggestion returning -1 on allocation
failure so we do the best effort to propagate the error.

Fixes: 107f041212 ("tools: bpftool: add JSON output for `bpftool prog dump jited *` command")
Reported-by: Michael Petlan <mpetlan@redhat.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jiri Olsa 2019-07-05 14:10:31 +02:00 committed by Daniel Borkmann
parent ba95c74524
commit aa52bcbe0e
1 changed files with 7 additions and 4 deletions
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11
tools/bpf/bpftool/jit_disasm.c
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@ -11,6 +11,8 @@
* Licensed under the GNU General Public License, version 2.0 (GPLv2) * Licensed under the GNU General Public License, version 2.0 (GPLv2)
*/ */
#define _GNU_SOURCE
#include <stdio.h>
#include <stdarg.h> #include <stdarg.h>
#include <stdint.h> #include <stdint.h>
#include <stdio.h> #include <stdio.h>
@ -44,11 +46,13 @@ static int fprintf_json(void *out, const char *fmt, ...)
char *s; char *s;
va_start(ap, fmt); va_start(ap, fmt);
if (vasprintf(&s, fmt, ap) < 0)
return -1;
va_end(ap);
if (!oper_count) { if (!oper_count) {
int i; int i;
s = va_arg(ap, char *);
/* Strip trailing spaces */ /* Strip trailing spaces */
i = strlen(s) - 1; i = strlen(s) - 1;
while (s[i] == ' ') while (s[i] == ' ')
@ -61,11 +65,10 @@ static int fprintf_json(void *out, const char *fmt, ...)
} else if (!strcmp(fmt, ",")) { } else if (!strcmp(fmt, ",")) {
/* Skip */ /* Skip */
} else { } else {
s = va_arg(ap, char *);
jsonw_string(json_wtr, s); jsonw_string(json_wtr, s);
oper_count++; oper_count++;
} }
va_end(ap); free(s);
return 0; return 0;
} }