[Crash-utility] [PATCH] mod: fix module object file lookup

[lijiang]

On Fri, Sep 3, 2021 at 8:03 PM Hari Bathini <hbathini at linux.ibm.com> wrote:

> On systems where vmlinux file is not under /usr/lib/debug/lib/modules
> directory, 'mod -s|-S' command may fail to find the module's object
> file with the below error:
>
>     mod: cannot find or load object file for sd_mod module
>
> Fix it by trying all possible module object file extentions while
> searching for the object file under /usr/lib/debug/lib/modules
> directory.
>
> Signed-off-by: Naveen N. Rao <naveen.n.rao at linux.ibm.com>
> Signed-off-by: Hari Bathini <hbathini at linux.ibm.com>
> ---
>  kernel.c |   13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/kernel.c b/kernel.c
> index 36fdea2..b2c8a0c 100644
> --- a/kernel.c
> +++ b/kernel.c
> @@ -4796,7 +4796,18 @@ module_objfile_search(char *modref, char *filename,
> char *tree)
>
>         sprintf(dir, "%s/%s", DEFAULT_REDHAT_DEBUG_LOCATION,
>                 kt->utsname.release);
> -       retbuf = search_directory_tree(dir, file, 0);
> +       if (!(retbuf = search_directory_tree(dir, file, 0))) {
> +               switch (kt->flags & (KMOD_V1|KMOD_V2))
> +               {
> +               case KMOD_V2:
> +                       sprintf(file, "%s.ko", modref);
> +                       retbuf = search_directory_tree(dir, file, 0);
> +                       if (!retbuf) {
> +                               sprintf(file, "%s.ko.debug", modref);
> +                               retbuf = search_directory_tree(dir, file,
> 0);
> +                       }
> +               }
> +       }
>
>         if (!retbuf && (env = getenv("CRASH_MODULE_PATH"))) {
>                 sprintf(dir, "%s", env);
>
>
>
Acked-by: Lianbo Jiang <lijiang at redhat.com>
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