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powerpc/ieee1275: Enter lockdown based on /ibm, secure-boot

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Read secure boot mode from 'ibm,secure-boot' property and if the secure boot
mode is set to 2 (enforce), enter lockdown. Else it is considered as disabled.
There are three secure boot modes. They are

0 - disabled
     No signature verification is performed. This is the default.
1 - audit
     Signature verification is performed and if signature verification fails,
     display the errors and allow the boot to continue.
2 - enforce
     Lockdown the GRUB. Signature verification is performed and if signature
     verification fails, display the errors and stop the boot.

Now, only support disabled and enforce.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Avnish Chouhan <avnish@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Sudhakar Kuppusamy authored and Daniel Kiper committed 2025-10-11 15:36:37 +02:00
1 parent e95c52f1f4
commit f8e8779d8e
4 files changed
+58 -2
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grub-core/kern/ieee1275/init.c
+54
View File
@@ -49,6 +49,14 @@
#if defined(__powerpc__) || defined(__i386__)
#include <grub/ieee1275/alloc.h>
#endif
#if defined(__powerpc__)
#include <grub/lockdown.h>
#endif
#ifdef __powerpc__
#define GRUB_SB_DISABLED ((grub_uint32_t) 0)
#define GRUB_SB_ENFORCE ((grub_uint32_t) 2)
#endif
/* The maximum heap size we're going to claim at boot. Not used by sparc. */
#ifdef __i386__
@@ -994,7 +1002,49 @@ grub_parse_cmdline (void)
}
}
}
#ifdef __powerpc__
static void
grub_ieee1275_get_secure_boot (void)
{
grub_ieee1275_phandle_t root;
grub_uint32_t sb_mode = GRUB_SB_DISABLED;
grub_int32_t rc;
rc = grub_ieee1275_finddevice ("/", &root);
if (rc != 0)
{
grub_error (GRUB_ERR_UNKNOWN_DEVICE, "couldn't find / node");
return;
}
rc = grub_ieee1275_get_integer_property (root, "ibm,secure-boot", &sb_mode, sizeof (sb_mode), 0);
if (rc != 0)
{
grub_error (GRUB_ERR_UNKNOWN_DEVICE, "couldn't examine /ibm,secure-boot property");
return;
}
/*
* Secure Boot Mode:
* 0 - disabled
* No signature verification is performed. This is the default.
* 1 - audit
* Signature verification is performed and if signature verification
* fails, display the errors and allow the boot to continue.
* 2 - enforce
* Lockdown the GRUB. Signature verification is performed and If
* signature verification fails, display the errors and stop the boot.
*
* Now, only support disabled and enforce.
*/
if (sb_mode == GRUB_SB_ENFORCE)
{
grub_dprintf ("ieee1275", "Secure Boot Enabled\n");
grub_lockdown ();
}
else
grub_dprintf ("ieee1275", "Secure Boot Disabled\n");
}
#endif /* __powerpc__ */
grub_addr_t grub_modbase;
void
@@ -1020,6 +1070,10 @@ grub_machine_init (void)
#else
grub_install_get_time_ms (grub_rtc_get_time_ms);
#endif
#ifdef __powerpc__
grub_ieee1275_get_secure_boot ();
#endif
}
void