public-mirrors/linux
1
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-08-05 16:54:27 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

x86/kexec: Mark relocate_kernel page as ROX instead of RWX

Browse source 
All writes to the page now happen before it gets marked as executable
(or after it's already switched to the identmap page tables where it's
OK to be RWX).

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Baoquan He <bhe@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20241205153343.3275139-14-dwmw2@infradead.org
This commit is contained in:
David Woodhouse 2024-12-05 15:05:19 +00:00 • committed by Ingo Molnar
parent 93e489ad7a
commit 5a82223e07
1 changed files with 2 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
arch/x86/kernel/machine_kexec_64.c
View file

@ -323,7 +323,7 @@ int machine_kexec_prepare(struct kimage *image)
__memcpy(control_page, __relocate_kernel_start, reloc_end - reloc_start);
set_memory_x((unsigned long)control_page, 1);
set_memory_rox((unsigned long)control_page, 1);
return 0;
}
@ -333,6 +333,7 @@ void machine_kexec_cleanup(struct kimage *image)
void *control_page = page_address(image->control_code_page);
set_memory_nx((unsigned long)control_page, 1);
set_memory_rw((unsigned long)control_page, 1);
free_transition_pgtable(image);
}