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Re: [PATCH v3] Print module name on license check failure
From: |
Daniel Kiper |
Subject: |
Re: [PATCH v3] Print module name on license check failure |
Date: |
Tue, 26 Oct 2021 13:52:51 +0200 |
User-agent: |
NeoMutt/20170113 (1.7.2) |
On Mon, Oct 25, 2021 at 06:17:03PM -0400, Robbie Harwood wrote:
> Before performing the license check, resolve the module name so that it
> can be printed if the license check fails. Prior to this change, grub
> would only indicate that the check had been failed, but not by what
> module. This made it difficult to track down either the problem module,
> or debug the false positive further.
>
> Signed-off-by: Robbie Harwood <rharwood@redhat.com>
> ---
> grub-core/kern/dl.c | 21 ++++++++++++++-------
> 1 file changed, 14 insertions(+), 7 deletions(-)
>
> diff --git a/grub-core/kern/dl.c b/grub-core/kern/dl.c
> index 48f8a7907..363bacc43 100644
> --- a/grub-core/kern/dl.c
> +++ b/grub-core/kern/dl.c
> @@ -457,14 +457,21 @@ grub_dl_find_section (Elf_Ehdr *e, const char *name)
> Be sure to understand your license obligations.
> */
> static grub_err_t
> -grub_dl_check_license (Elf_Ehdr *e)
> +grub_dl_check_license (grub_dl_t mod, Elf_Ehdr *e)
> {
> Elf_Shdr *s = grub_dl_find_section (e, ".module_license");
> - if (s && (grub_strcmp ((char *) e + s->sh_offset, "LICENSE=GPLv3") == 0
> - || grub_strcmp ((char *) e + s->sh_offset, "LICENSE=GPLv3+") == 0
> - || grub_strcmp ((char *) e + s->sh_offset, "LICENSE=GPLv2+") == 0))
> + if (!s)
s == NULL please...
> + return grub_error (GRUB_ERR_BAD_MODULE,
> + "no license section in module %.64s", mod->name);
> +
> + if (grub_strcmp ((char *) e + s->sh_offset, "LICENSE=GPLv3") == 0
> + || grub_strcmp ((char *) e + s->sh_offset, "LICENSE=GPLv3+") == 0
> + || grub_strcmp ((char *) e + s->sh_offset, "LICENSE=GPLv2+") == 0)
Could use grub_strncmp() instead of grub_strcmp() here?
> return GRUB_ERR_NONE;
> - return grub_error (GRUB_ERR_BAD_MODULE, "incompatible license");
> +
> + return grub_error (GRUB_ERR_BAD_MODULE,
> + "incompatible license in module %.64s: %.64s", mod->name,
> + (char *) e + s->sh_offset);
> }
>
> static grub_err_t
> @@ -641,8 +648,8 @@ grub_dl_load_core_noinit (void *addr, grub_size_t size)
> constitutes linking) and GRUB core being licensed under GPLv3+.
> Be sure to understand your license obligations.
> */
> - if (grub_dl_check_license (e)
> - || grub_dl_resolve_name (mod, e)
> + if (grub_dl_resolve_name (mod, e)
> + || grub_dl_check_license (mod, e)
I think you should split this patch into two. One which improves error
messages and another which imposes length restrictions on the
grub_strcmp() and grub_error() in the grub_dl_check_license(). And
I think you should use 63 instead of 64 (63 + NUL gives us 64 :-)).
Daniel