Hi Steve,
Could you pick this separately since this is a bugfix?
Thank you,
On Wed, 21 Feb 2018 23:54:37 +0900
Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote:
> In Documentation/trace/kprobetrace.txt, it says
>
> @SYM[+|-offs] : Fetch memory at SYM +|- offs (SYM should be a data symbol)
>
> However, the parser doesn't parse minus offset correctly.
> This fixes the parser to get minus offset correctly.
>
> Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
> ---
> kernel/trace/trace_kprobe.c | 2 +-
> kernel/trace/trace_probe.c | 10 +++++-----
> kernel/trace/trace_probe.h | 2 +-
> 3 files changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index 5ce9b8cf7be3..dab4a5b54269 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -754,7 +754,7 @@ static int create_trace_kprobe(int argc, char **argv)
> /* a symbol specified */
> symbol = argv[1];
> /* TODO: support .init module functions */
> - ret = traceprobe_split_symbol_offset(symbol, &offset);
> + ret = traceprobe_split_symbol_offset(symbol, (long *)&offset);
> if (ret) {
> pr_info("Failed to parse either an address or a symbol.\n");
> return ret;
> diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
> index d59357308677..3e291a754862 100644
> --- a/kernel/trace/trace_probe.c
> +++ b/kernel/trace/trace_probe.c
> @@ -320,7 +320,7 @@ static fetch_func_t get_fetch_size_function(const struct fetch_type *type,
> }
>
> /* Split symbol and offset. */
> -int traceprobe_split_symbol_offset(char *symbol, unsigned long *offset)
> +int traceprobe_split_symbol_offset(char *symbol, long *offset)
> {
> char *tmp;
> int ret;
> @@ -328,13 +328,13 @@ int traceprobe_split_symbol_offset(char *symbol, unsigned long *offset)
> if (!offset)
> return -EINVAL;
>
> - tmp = strchr(symbol, '+');
> + tmp = strpbrk(symbol, "+-");
> if (tmp) {
> - /* skip sign because kstrtoul doesn't accept '+' */
> - ret = kstrtoul(tmp + 1, 0, offset);
> + ret = kstrtoul(tmp + 1, 0, (unsigned long *)offset);
> if (ret)
> return ret;
> -
> + if (*tmp == '-')
> + *offset = -(*offset);
> *tmp = '\0';
> } else
> *offset = 0;
> diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
> index 0745f895f780..75daff22ccea 100644
> --- a/kernel/trace/trace_probe.h
> +++ b/kernel/trace/trace_probe.h
> @@ -365,7 +365,7 @@ extern int traceprobe_conflict_field_name(const char *name,
> extern void traceprobe_update_arg(struct probe_arg *arg);
> extern void traceprobe_free_probe_arg(struct probe_arg *arg);
>
> -extern int traceprobe_split_symbol_offset(char *symbol, unsigned long *offset);
> +extern int traceprobe_split_symbol_offset(char *symbol, long *offset);
>
> /* Sum up total data length for dynamic arraies (strings) */
> static nokprobe_inline int
>
--
Masami Hiramatsu <mhiramat@xxxxxxxxxx>
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