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ARM: imx6: mark OCRAM mapping read-only

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iMX6 needs to write some code to OCRAM which resumes the DDR controller
after suspend. However, merely using __arm_ioremap_exec() causes the
kernel to complain of a W+X mapping. Solve this by using the newly
introduced __arm_iomem_set_ro() function to prevent inadvertent or
malicious writes to code we may later execute.

Tested-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Russell King (Oracle) 2021-09-21 12:59:59 +01:00
parent b8bc0e50a3
commit 4aede550f1
1 changed files with 2 additions and 0 deletions
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arch/arm/mach-imx/pm-imx6.c
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@ -571,6 +571,8 @@ static int __init imx6q_suspend_init(const struct imx6_pm_socdata *socdata)
&imx6_suspend,
MX6Q_SUSPEND_OCRAM_SIZE - sizeof(*pm_info));
__arm_iomem_set_ro(suspend_ocram_base, MX6Q_SUSPEND_OCRAM_SIZE);
goto put_device;
pl310_cache_map_failed: