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bpf: initialize the verifier log

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If program loading fails before verifier prints its first
message, the verifier log will not be initialized.  Always
set the first character of the log buffer to zero to make
sure we don't dump non-printable characters to the terminal.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski 2017-11-22 17:00:53 -08:00 committed by Stephen Hemminger
parent de3ddbc27d
commit f6a54d72a5
1 changed files with 2 additions and 1 deletions
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3
lib/bpf.c
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@ -1153,7 +1153,7 @@ static int bpf_log_realloc(struct bpf_elf_ctx *ctx)
{
const size_t log_max = UINT_MAX >> 8;
size_t log_size = ctx->log_size;
void *ptr;
char *ptr;
if (!ctx->log) {
log_size = 65536;
@ -1169,6 +1169,7 @@ static int bpf_log_realloc(struct bpf_elf_ctx *ctx)
if (!ptr)
return -ENOMEM;
ptr[0] = 0;
ctx->log = ptr;
ctx->log_size = log_size;