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boot: Check if LoadOptions contains FilePath prefix

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This commit is contained in:
Stefanie Dukovac 2024-12-16 15:17:38 -05:00
parent 06ffa66a5b
commit aac0db6cd9
1 changed files with 20 additions and 1 deletions
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21
src/boot/stub.c
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@ -232,6 +232,17 @@ nothing:
return false;
}
static char16_t * strip_stub_cmdline(char16_t *cmdline, const char16_t *file_path) {
if (file_path == NULL || strlen16(file_path) == 0) return cmdline;
int ret = strcmp16(cmdline, file_path);
if (!ret) {
return NULL;
} else if (ret > 0) {
return cmdline + strlen16(file_path) + 1;
}
return cmdline;
}
static void process_arguments(
EFI_HANDLE stub_image,
EFI_LOADED_IMAGE_PROTOCOL *loaded_image,
@ -253,11 +264,19 @@ static void process_arguments(
if (loaded_image->LoadOptionsSize < sizeof(char16_t) || ((const char16_t *) loaded_image->LoadOptions)[0] <= 0x1F)
goto nothing;
/* Not running from EFI shell, use entire LoadOptions. Note that LoadOptions is a void*, so
/* Not running from EFI shell. Note that LoadOptions is a void*, so
* it could actually be anything! */
char16_t *c = xstrndup16(loaded_image->LoadOptions, loaded_image->LoadOptionsSize / sizeof(char16_t));
parse_profile_from_cmdline(&c, ret_profile);
*ret_cmdline = mangle_stub_cmdline(c);
/* When LoadOptions starts with the stub path ignore it */
_cleanup_free_ char16_t *p = NULL;
if (loaded_image->FilePath && device_path_to_str(loaded_image->FilePath, &p) == EFI_SUCCESS) {
*ret_cmdline = strip_stub_cmdline(*ret_cmdline, p);
if (*ret_cmdline == NULL) *ret_cmdline = mfree(*ret_cmdline);
}
return;
}