diff options
| author | Youling Tang <tangyouling@kylinos.cn> | 2025-10-02 22:39:08 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2025-10-02 22:39:08 +0800 |
| commit | c8168b4faf1d62cbb320a3e518ad31cdd567cb05 (patch) | |
| tree | c2c827892dac92a8945ee1e46406fbb8901dc354 | |
| parent | 1bcca8620a915d2f98ad7641f82d799c17f04b93 (diff) | |
LoongArch: Automatically disable kaslr if boot from kexec_file
Automatically disable kaslr when the kernel loads from kexec_file.
kexec_file loads the secondary kernel image to a non-linked address,
inherently providing KASLR-like randomization.
However, on LoongArch where System RAM may be non-contiguous, enabling
KASLR for the second kernel may relocate it to an invalid memory region
and cause a boot failure. Thus, we disable KASLR when "kexec_file" is
detected in the command line.
To ensure compatibility with older kernels loaded via kexec_file, this
patch should be backported to stable branches.
Cc: stable@vger.kernel.org
Signed-off-by: Youling Tang <tangyouling@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
| -rw-r--r-- | arch/loongarch/kernel/relocate.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/relocate.c b/arch/loongarch/kernel/relocate.c index 50c469067f3a..b5e2312a2fca 100644 --- a/arch/loongarch/kernel/relocate.c +++ b/arch/loongarch/kernel/relocate.c @@ -166,6 +166,10 @@ static inline __init bool kaslr_disabled(void) return true; #endif + str = strstr(boot_command_line, "kexec_file"); + if (str == boot_command_line || (str > boot_command_line && *(str - 1) == ' ')) + return true; + return false; } |