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LoongArch: Automatically disable kaslr if boot from kexec_file

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commit c8168b4faf1d62cbb320a3e518ad31cdd567cb05 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Youling Tang
2025-10-02 22:39:08 +08:00
committed by Greg Kroah-Hartman
parent 846cafc472
commit 7eca645917
1 changed files with 4 additions and 0 deletions
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4
arch/loongarch/kernel/relocate.c
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@@ -124,6 +124,10 @@ static inline __init bool kaslr_disabled(void)
if (str == boot_command_line || (str > boot_command_line && *(str - 1) == ' '))
return true;
str = strstr(boot_command_line, "kexec_file");
if (str == boot_command_line || (str > boot_command_line && *(str - 1) == ' '))
return true;
return false;
}