6.12-stable review patch. If anyone has any objections, please let me know.
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From: Huacai Chen chenhuacai@loongson.cn
commit a1a81b5477196ca1290b367404a461e046e647d5 upstream.
Now relocate_new_kernel_size is a .long value, which means 32bit, so its high 32bit is undefined. This causes memcpy((void *)reboot_code_buffer, relocate_new_kernel, relocate_new_kernel_size) in machine_kexec_prepare() access out of range memories in some cases, and then end up with an ADE exception.
So make relocate_new_kernel_size be a .quad value, which means 64bit, to avoid such errors.
Cc: stable@vger.kernel.org Signed-off-by: Huacai Chen chenhuacai@loongson.cn Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/loongarch/kernel/relocate_kernel.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/loongarch/kernel/relocate_kernel.S +++ b/arch/loongarch/kernel/relocate_kernel.S @@ -109,4 +109,4 @@ SYM_CODE_END(kexec_smp_wait) relocate_new_kernel_end:
.section ".data" -SYM_DATA(relocate_new_kernel_size, .long relocate_new_kernel_end - relocate_new_kernel) +SYM_DATA(relocate_new_kernel_size, .quad relocate_new_kernel_end - relocate_new_kernel)