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path: root/drivers/firmware/efi/libstub/x86-stub.c
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Diffstat (limited to 'drivers/firmware/efi/libstub/x86-stub.c')
-rw-r--r--drivers/firmware/efi/libstub/x86-stub.c30
1 files changed, 27 insertions, 3 deletions
diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c
index 19b51dc34f..1983fd3bf3 100644
--- a/drivers/firmware/efi/libstub/x86-stub.c
+++ b/drivers/firmware/efi/libstub/x86-stub.c
@@ -776,6 +776,26 @@ static void error(char *str)
efi_warn("Decompression failed: %s\n", str);
}
+static const char *cmdline_memmap_override;
+
+static efi_status_t parse_options(const char *cmdline)
+{
+ static const char opts[][14] = {
+ "mem=", "memmap=", "efi_fake_mem=", "hugepages="
+ };
+
+ for (int i = 0; i < ARRAY_SIZE(opts); i++) {
+ const char *p = strstr(cmdline, opts[i]);
+
+ if (p == cmdline || (p > cmdline && isspace(p[-1]))) {
+ cmdline_memmap_override = opts[i];
+ break;
+ }
+ }
+
+ return efi_parse_options(cmdline);
+}
+
static efi_status_t efi_decompress_kernel(unsigned long *kernel_entry)
{
unsigned long virt_addr = LOAD_PHYSICAL_ADDR;
@@ -807,6 +827,10 @@ static efi_status_t efi_decompress_kernel(unsigned long *kernel_entry)
!memcmp(efistub_fw_vendor(), ami, sizeof(ami))) {
efi_debug("AMI firmware v2.0 or older detected - disabling physical KASLR\n");
seed[0] = 0;
+ } else if (cmdline_memmap_override) {
+ efi_info("%s detected on the kernel command line - disabling physical KASLR\n",
+ cmdline_memmap_override);
+ seed[0] = 0;
}
boot_params_ptr->hdr.loadflags |= KASLR_FLAG;
@@ -883,7 +907,7 @@ void __noreturn efi_stub_entry(efi_handle_t handle,
}
#ifdef CONFIG_CMDLINE_BOOL
- status = efi_parse_options(CONFIG_CMDLINE);
+ status = parse_options(CONFIG_CMDLINE);
if (status != EFI_SUCCESS) {
efi_err("Failed to parse options\n");
goto fail;
@@ -892,7 +916,7 @@ void __noreturn efi_stub_entry(efi_handle_t handle,
if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr |
((u64)boot_params->ext_cmd_line_ptr << 32));
- status = efi_parse_options((char *)cmdline_paddr);
+ status = parse_options((char *)cmdline_paddr);
if (status != EFI_SUCCESS) {
efi_err("Failed to parse options\n");
goto fail;
@@ -941,7 +965,7 @@ void __noreturn efi_stub_entry(efi_handle_t handle,
efi_random_get_seed();
- efi_retrieve_tpm2_eventlog();
+ efi_retrieve_eventlog();
setup_graphics(boot_params);