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authorHuacai Chen <chenhuacai@loongson.cn>2024-07-20 22:41:06 +0800
committerHuacai Chen <chenhuacai@loongson.cn>2024-07-20 22:41:06 +0800
commit67e6b115ddcf8f03108cedcf66261153904ce4fb (patch)
tree373fd51d67127b34c507421dc32bc65d2f1eeb44 /arch
parente523a5a65f34ca5bd67ccfdfdccf04689b58f0bf (diff)
LoongArch: Automatically disable KASLR for hibernation
Hibernation assumes the memory layout after resume be the same as that before sleep, so it expects the kernel is loaded at the same position. To achieve this goal we automatically disable KASLR if user explicitly requests hibernation via the "resume=" command line. Since "nohibernate" and "noresume" have higher priorities than "resume=", we only disable KASLR if there is no "nohibernate" and "noresume". Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch')
-rw-r--r--arch/loongarch/kernel/relocate.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/relocate.c b/arch/loongarch/kernel/relocate.c
index 1acfa704c8d0..6834d627ff20 100644
--- a/arch/loongarch/kernel/relocate.c
+++ b/arch/loongarch/kernel/relocate.c
@@ -123,6 +123,32 @@ static inline __init bool kaslr_disabled(void)
if (str == boot_command_line || (str > boot_command_line && *(str - 1) == ' '))
return true;
+#ifdef CONFIG_HIBERNATION
+ str = strstr(builtin_cmdline, "nohibernate");
+ if (str == builtin_cmdline || (str > builtin_cmdline && *(str - 1) == ' '))
+ return false;
+
+ str = strstr(boot_command_line, "nohibernate");
+ if (str == boot_command_line || (str > boot_command_line && *(str - 1) == ' '))
+ return false;
+
+ str = strstr(builtin_cmdline, "noresume");
+ if (str == builtin_cmdline || (str > builtin_cmdline && *(str - 1) == ' '))
+ return false;
+
+ str = strstr(boot_command_line, "noresume");
+ if (str == boot_command_line || (str > boot_command_line && *(str - 1) == ' '))
+ return false;
+
+ str = strstr(builtin_cmdline, "resume=");
+ if (str == builtin_cmdline || (str > builtin_cmdline && *(str - 1) == ' '))
+ return true;
+
+ str = strstr(boot_command_line, "resume=");
+ if (str == boot_command_line || (str > boot_command_line && *(str - 1) == ' '))
+ return true;
+#endif
+
return false;
}