Messages in this thread |  | | Date | Sat, 31 Dec 2022 14:40:59 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH qemu] x86: don't let decompressed kernel image clobber setup_data |
| |
On Fri, Dec 30, 2022 at 05:06:55PM -0800, H. Peter Anvin wrote: > This needs to be something like: > > kernel_add_identity_map(sd_addr, sd_addr + sizeof(*sd)); > kernel_add_identity_map(sd_addr + sizeof(*sd), > sd_addr + sizeof(*sd) + sd->len);
It still #PFs with that:
(gdb) bt #0 0xffffffff84738576 in native_halt () at ./arch/x86/include/asm/irqflags.h:57 #1 halt () at ./arch/x86/include/asm/irqflags.h:98 #2 early_fixup_exception (regs=regs@entry=0xffffffff84007dc8, trapnr=trapnr@entry=14) at arch/x86/mm/extable.c:340 #3 0xffffffff846ff465 in do_early_exception (regs=0xffffffff84007dc8, trapnr=14) at arch/x86/kernel/head64.c:424 #4 0xffffffff846ff14f in early_idt_handler_common () at arch/x86/kernel/head_64.S:483 #5 0xc149f9894908788d in ?? () #6 0xffffffffff2003fc in ?? () #7 0x0000000000000010 in fixed_percpu_data () #8 0xdffffc0000000000 in ?? () #9 0xffffffff84007ea8 in init_thread_union () #10 0xffffffffff20088d in ?? () #11 0x0000000000000000 in ?? ()
/me goes to dig more.
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
|  |