[PATCH 1/2] arm/mm : omit [_text, _stext) from kernel code region
From: Jungseung Lee
Date: Mon Mar 06 2023 - 01:11:11 EST
The resource reservations in /proc/iomem made for the kernel code did
not reflect the gaps between pagetable and text.
In particular, if the CONFIG_STRICT_KERNEL_RWX option is turned on,
the wrong area is shown as the kernel code area.
Fix it by removing [_text, _stext) from kernel code region.
Before:
04000000-2f7fffff : System RAM
04008000-04cfffff : Kernel code
04e00000-05369a27 : Kernel data
After :
04000000-2f7fffff : System RAM
04100000-04cfffff : Kernel code
04e00000-05369a27 : Kernel data
Signed-off-by: Jungseung Lee <js07.lee@xxxxxxxxxxx>
---
arch/arm/kernel/setup.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 75cd469..3059860 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -865,7 +865,7 @@ static void __init request_standard_resources(const struct machine_desc *mdesc)
struct resource *res;
u64 i;
- kernel_code.start = virt_to_phys(_text);
+ kernel_code.start = virt_to_phys(_stext);
kernel_code.end = virt_to_phys(__init_begin - 1);
kernel_data.start = virt_to_phys(_sdata);
kernel_data.end = virt_to_phys(_end - 1);
@@ -1139,7 +1139,7 @@ void __init setup_arch(char **cmdline_p)
if (mdesc->reboot_mode != REBOOT_HARD)
reboot_mode = mdesc->reboot_mode;
- setup_initial_init_mm(_text, _etext, _edata, _end);
+ setup_initial_init_mm(_stext, _etext, _edata, _end);
/* populate cmd_line too for later use, preserving boot_command_line */
strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
--
2.7.4