diff options
| author |   Daniel Kiper <daniel.kiper@oracle.com> | 2019-11-12 14:46:40 +0100 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2019-11-12 16:21:15 +0100 |
| commit | b3c72fc9a78e74161f9d05ef7191706060628f8c (patch) | |
| tree | efcd2356602631b630e8b8af7d9fa5158ba401f4 /arch/x86/boot | |
| parent | x86/boot: Introduce kernel_info.setup_type_max (diff) | |
| download | linux-dev-b3c72fc9a78e74161f9d05ef7191706060628f8c.tar.xz linux-dev-b3c72fc9a78e74161f9d05ef7191706060628f8c.zip | |
x86/boot: Introduce setup_indirect
The setup_data is a bit awkward to use for extremely large data objects,
both because the setup_data header has to be adjacent to the data object
and because it has a 32-bit length field. However, it is important that
intermediate stages of the boot process have a way to identify which
chunks of memory are occupied by kernel data. Thus introduce an uniform
way to specify such indirect data as setup_indirect struct and
SETUP_INDIRECT type.
And finally bump setup_header version in arch/x86/boot/header.S.
Suggested-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Ross Philipson <ross.philipson@oracle.com>
Reviewed-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: ard.biesheuvel@linaro.org
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: dave.hansen@linux.intel.com
Cc: eric.snowberg@oracle.com
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Juergen Gross <jgross@suse.com>
Cc: kanth.ghatraju@oracle.com
Cc: linux-doc@vger.kernel.org
Cc: linux-efi <linux-efi@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: rdunlap@infradead.org
Cc: ross.philipson@oracle.com
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Cc: xen-devel@lists.xenproject.org
Link: https://lkml.kernel.org/r/20191112134640.16035-4-daniel.kiper@oracle.com
Diffstat (limited to 'arch/x86/boot')
| -rw-r--r-- | arch/x86/boot/compressed/kaslr.c | 12 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/kernel_info.S | 2 | ||||
| -rw-r--r-- | arch/x86/boot/header.S | 2 |
3 files changed, 14 insertions, 2 deletions
diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c index 2e53c056ba20..bb9bfef174ae 100644 --- a/arch/x86/boot/compressed/kaslr.c +++ b/arch/x86/boot/compressed/kaslr.c @@ -459,6 +459,18 @@ static bool mem_avoid_overlap(struct mem_vector *img, is_overlapping = true; } + if (ptr->type == SETUP_INDIRECT && + ((struct setup_indirect *)ptr->data)->type != SETUP_INDIRECT) { + avoid.start = ((struct setup_indirect *)ptr->data)->addr; + avoid.size = ((struct setup_indirect *)ptr->data)->len; + + if (mem_overlaps(img, &avoid) && (avoid.start < earliest)) { + *overlap = avoid; + earliest = overlap->start; + is_overlapping = true; + } + } + ptr = (struct setup_data *)(unsigned long)ptr->next; } diff --git a/arch/x86/boot/compressed/kernel_info.S b/arch/x86/boot/compressed/kernel_info.S index 018dacbd753e..f818ee8fba38 100644 --- a/arch/x86/boot/compressed/kernel_info.S +++ b/arch/x86/boot/compressed/kernel_info.S @@ -14,7 +14,7 @@ kernel_info: /* Size total. */ .long kernel_info_end - kernel_info - /* Maximal allowed type for setup_data. */ + /* Maximal allowed type for setup_data and setup_indirect structs. */ .long SETUP_TYPE_MAX kernel_info_var_len_data: diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S index 22dcecaaa898..97d9b6d6c1af 100644 --- a/arch/x86/boot/header.S +++ b/arch/x86/boot/header.S @@ -300,7 +300,7 @@ _start: # Part 2 of the header, from the old setup.S .ascii "HdrS" # header signature - .word 0x020d # header version number (>= 0x0105) + .word 0x020f # header version number (>= 0x0105) # or else old loadlin-1.5 will fail) .globl realmode_swtch realmode_swtch: .word 0, 0 # default_switch, SETUPSEG |