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LoongArch: Automatically disable KASLR for hibernation

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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>
This commit is contained in:
Huacai Chen 2024-07-20 22:41:06 +08:00
parent e523a5a65f
commit 67e6b115dd
1 changed files with 26 additions and 0 deletions
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26
arch/loongarch/kernel/relocate.c
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@ -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;
}