On Thu, Jul 27, 2023 at 05:57:26PM +0200, Ahmad Fatoum wrote:
> One would expect that all children of a configuration node are signature
> nodes, but OpenEmbedded's core kernel-fitimage.bbclass always generates
> a dummy hash-1 node into configurations with just an algo and no digest,
> which barebox would try to interpret as a FIT configuration leading to
> an error verifying the FIT image:
>
> ERROR: FIT: hashed-strings start not found in
> /configurations/conf-something/hash-1
>
> Make it possible to boot such FIT images by only verifying nodes that
> are supposed to be signatures. This aligns us with U-Boot behavior, but
> introduces theoretical breakage for FIT images that have signature nodes
> with funny names. Given that everyone uses signature@1 or signature-1 and we
> even
> hardcode it as places and that the failure mode is to refuse boot of old
> images with new barebox version when FIT image verification is required,
> this is deemed acceptable.
>
> Signed-off-by: Ahmad Fatoum <[email protected]>
> ---
> common/image-fit.c | 4 ++++
> drivers/of/base.c | 15 +++++++++++++++
> include/of.h | 6 ++++++
> 3 files changed, 25 insertions(+)
Applied, thanks
Sascha
>
> diff --git a/common/image-fit.c b/common/image-fit.c
> index 9bea62bb34a0..e73ed581a2be 100644
> --- a/common/image-fit.c
> +++ b/common/image-fit.c
> @@ -670,8 +670,12 @@ static int fit_config_verify_signature(struct fit_handle
> *handle, struct device_
> }
>
> for_each_child_of_node(conf_node, sig_node) {
> + if (!of_node_has_prefix(sig_node, "signature"))
> + continue;
> +
> if (handle->verbose)
> of_print_nodes(sig_node, 0, ~0);
> +
> ret = fit_verify_signature(sig_node, handle->fit);
> if (ret < 0)
> return ret;
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index 4dc1c76b136d..03cceeffc0df 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -24,6 +24,21 @@
>
> static struct device_node *root_node;
>
> +/**
> + * of_node_has_prefix - Test if a node name has a given prefix
> + * @np: The node name to test
> + * @prefix: The prefix to see if @np starts with
> + *
> + * Returns:
> + * * strlen(@prefix) if @np starts with @prefix
> + * * 0 if @np does not start with @prefix
> + */
> +size_t of_node_has_prefix(const struct device_node *np, const char *prefix)
> +{
> + return np ? str_has_prefix(kbasename(np->full_name), prefix) : 0;
> +}
> +EXPORT_SYMBOL(of_node_has_prefix);
> +
> bool of_node_name_eq(const struct device_node *np, const char *name)
> {
> const char *node_name;
> diff --git a/include/of.h b/include/of.h
> index 92a15f5c4a13..b3e4d4699248 100644
> --- a/include/of.h
> +++ b/include/of.h
> @@ -131,6 +131,7 @@ extern int of_n_addr_cells(struct device_node *np);
> extern int of_bus_n_size_cells(struct device_node *np);
> extern int of_n_size_cells(struct device_node *np);
> extern bool of_node_name_eq(const struct device_node *np, const char *name);
> +extern size_t of_node_has_prefix(const struct device_node *np, const char
> *prefix);
>
> extern struct property *of_find_property(const struct device_node *np,
> const char *name, int *lenp);
> @@ -377,6 +378,11 @@ static inline bool of_node_name_eq(const struct
> device_node *np, const char *nam
> return false;
> }
>
> +static inline size_t of_node_has_prefix(const struct device_node *np, const
> char *prefix)
> +{
> + return 0;
> +}
> +
> static inline int of_parse_partitions(struct cdev *cdev,
> struct device_node *node)
> {
> --
> 2.39.2
>
>
>
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