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| author | Jinyang He <hejinyang@loongson.cn> | 2021-02-05 18:11:21 +0800 |
|---|---|---|
| committer | Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2021-02-09 10:54:29 +0100 |
| commit | d4d3ef8b347b73aa60f60f4be06acf1643e79f34 (patch) | |
| tree | 942b434f91b73a89a870d0df4d4116bcb5965cf9 | |
| parent | 1ddc96bd42daeeb58f66c9515e506f245ccb00c6 (diff) | |
| download | linux-d4d3ef8b347b73aa60f60f4be06acf1643e79f34.tar.bz2 | |
MIPS: relocatable: Provide kaslr_offset() to get the kernel offset
Provide kaslr_offset() to get the kernel offset when KASLR is enabled.
Error may occur before update_kaslr_offset(), so put it at the end of
the offset branch.
Fixes: a307a4ce9ecd ("MIPS: Loongson64: Add KASLR support")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
| -rw-r--r-- | arch/mips/include/asm/page.h | 6 | ||||
| -rw-r--r-- | arch/mips/kernel/relocate.c | 10 | ||||
| -rw-r--r-- | arch/mips/kernel/setup.c | 3 |
3 files changed, 19 insertions, 0 deletions
diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h index 6a77bc4a6eec..74082e35d57c 100644 --- a/arch/mips/include/asm/page.h +++ b/arch/mips/include/asm/page.h @@ -255,6 +255,12 @@ extern bool __virt_addr_valid(const volatile void *kaddr); #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_TSK_EXEC +extern unsigned long __kaslr_offset; +static inline unsigned long kaslr_offset(void) +{ + return __kaslr_offset; +} + #include <asm-generic/memory_model.h> #include <asm-generic/getorder.h> diff --git a/arch/mips/kernel/relocate.c b/arch/mips/kernel/relocate.c index c643c816cbe0..95abb9c82f00 100644 --- a/arch/mips/kernel/relocate.c +++ b/arch/mips/kernel/relocate.c @@ -300,6 +300,13 @@ static inline int __init relocation_addr_valid(void *loc_new) return 1; } +static inline void __init update_kaslr_offset(unsigned long *addr, long offset) +{ + unsigned long *new_addr = (unsigned long *)RELOCATED(addr); + + *new_addr = (unsigned long)offset; +} + #if defined(CONFIG_USE_OF) void __weak *plat_get_fdt(void) { @@ -410,6 +417,9 @@ void *__init relocate_kernel(void) /* Return the new kernel's entry point */ kernel_entry = RELOCATED(start_kernel); + + /* Error may occur before, so keep it at last */ + update_kaslr_offset(&__kaslr_offset, offset); } out: return kernel_entry; diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c index 3785c72bc3bc..f4e19125521a 100644 --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c @@ -84,6 +84,9 @@ static struct resource code_resource = { .name = "Kernel code", }; static struct resource data_resource = { .name = "Kernel data", }; static struct resource bss_resource = { .name = "Kernel bss", }; +unsigned long __kaslr_offset __ro_after_init; +EXPORT_SYMBOL(__kaslr_offset); + static void *detect_magic __initdata = detect_memory_region; #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET |