[U-Boot] [PATCH][v2] armv8: sec_firmware: Remove JR3 from device tree node in all cases

[U-Boot] [PATCH][v2] armv8: sec_firmware: Remove JR3 from device tree node in all cases

[Ruchika Gupta]

JR3 was getting removed from device tree only if random number generation
was successful. However, if SEC firmware is present,JR3 should be removed
from device tree node irrespective of the random seed generation as
SEC firmware reserves it for it's use. Not removing it in case of random
number generation failure causes the kernel to crash.

Random number generation was being called twice. This is not required.
If SEC firmware is running, SIP call can be made to the SEC firmware to
get the random number. This call itself would return failure if function
is not supported. Duplicate calling of random number generation function
has been removed

Signed-off-by: Ruchika Gupta <ruchika.gupta@nxp.com>
---
Changes from v1:
Removed unused variable rand from the sec_firmware_support_hwrng function

 arch/arm/cpu/armv8/fsl-layerscape/fdt.c | 4 ++--
 arch/arm/cpu/armv8/sec_firmware.c       | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/fdt.c b/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
index 99c5d13..955ef30 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
@@ -415,8 +415,8 @@ void ft_cpu_setup(void *blob, bd_t *bd)
 		ccsr_sec_t __iomem *sec;
 
 #ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
-		if (fdt_fixup_kaslr(blob))
-			fdt_fixup_remove_jr(blob);
+		fdt_fixup_remove_jr(blob);
+		fdt_fixup_kaslr(blob);
 #endif
 
 		sec = (void __iomem *)CONFIG_SYS_FSL_SEC_ADDR;
diff --git a/arch/arm/cpu/armv8/sec_firmware.c b/arch/arm/cpu/armv8/sec_firmware.c
index b56ea78..98d7be3 100644
--- a/arch/arm/cpu/armv8/sec_firmware.c
+++ b/arch/arm/cpu/armv8/sec_firmware.c
@@ -318,9 +318,7 @@ unsigned int sec_firmware_support_psci_version(void)
  */
 bool sec_firmware_support_hwrng(void)
 {
-	uint8_t rand[8];
 	if (sec_firmware_addr & SEC_FIRMWARE_RUNNING) {
-		if (!sec_firmware_get_random(rand, 8))
 			return true;
 	}
 
@@ -429,8 +427,10 @@ int fdt_fixup_kaslr(void *fdt)
 
 #if defined(CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT)
 	/* Check if random seed generation is  supported */
-	if (sec_firmware_support_hwrng() == false)
+	if (sec_firmware_support_hwrng() == false) {
+		printf("WARNING: SEC firmware not running, no kaslr-seed\n");
 		return 0;
+	}
 
 	ret = sec_firmware_get_random(rand, 8);
 	if (ret < 0) {
-- 
2.7.4

[U-Boot] [PATCH][v2] armv8: sec_firmware: Remove JR3 from device tree node in all cases

[York Sun]

On 04/12/2018 05:53 AM, Ruchika Gupta wrote:
> JR3 was getting removed from device tree only if random number generation
> was successful. However, if SEC firmware is present,JR3 should be removed
> from device tree node irrespective of the random seed generation as
> SEC firmware reserves it for it's use. Not removing it in case of random
> number generation failure causes the kernel to crash.
> 
> Random number generation was being called twice. This is not required.
> If SEC firmware is running, SIP call can be made to the SEC firmware to
> get the random number. This call itself would return failure if function
> is not supported. Duplicate calling of random number generation function
> has been removed
> 
> Signed-off-by: Ruchika Gupta <ruchika.gupta@nxp.com>
> ---
> Changes from v1:
> Removed unused variable rand from the sec_firmware_support_hwrng function
> 
Applied to fsl-qoriq master, awaiting upstream.
Thanks.

York