On Wed, Feb 16, 2022 at 11:39:31AM -0500, Joe Lawrence wrote:
> diff --git a/include/uapi/linux/livepatch.h b/include/uapi/linux/livepatch.h
> index e19430918a07..2ee98e985c2a 100644
> --- a/include/uapi/linux/livepatch.h
> +++ b/include/uapi/linux/livepatch.h
> @@ -9,7 +9,17 @@
> #ifndef _UAPI_LIVEPATCH_H
> #define _UAPI_LIVEPATCH_H
>
> +#include <linux/types.h>
> +
> #define KLP_RELA_PREFIX ".klp.rela."
> #define KLP_SYM_PREFIX ".klp.sym."
>
> +struct klp_module_reloc {
> + union {
> + void *sym;
> + __u64 sym64; /* Force 64-bit width */
> + };
> + __u32 sympos;
> +} __packed;
> +
>
> [ ... snip ... ]
>
> diff --git a/scripts/livepatch/klp-convert.h b/scripts/livepatch/klp-convert.h
> new file mode 100644
> index 000000000000..35b9dc4e32c4
> --- /dev/null
> +++ b/scripts/livepatch/klp-convert.h
>
> [ ... snip ... ]
>
> +struct klp_module_reloc {
> + union {
> + void *sym;
> + uint64_t sym64; /* Force 64-bit width */
> + };
> + uint32_t sympos;
> +} __packed;
This was a hack I added to force a consistent width for the symbol
pointer in case the user was building for 32-bit. The actual void
*sym64 value itself is not so interesting as it's only needed for the
compiler to create a relocation (later resolved by klp-convert). That
said, sympos is used by klp-convert, and I bet it's not endian-safe
here.
Better suggestions welcome :)
-- Joe
