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SubjectRe: [PATCH] mm, kasan: don't poison boot memory
On Tue, Feb 23, 2021 at 01:05:05PM -0500, George Kennedy wrote:
> On 2/23/2021 10:47 AM, Mike Rapoport wrote:
>
> It now crashes here:
>
> [    0.051019] ACPI: Early table checksum verification disabled
> [    0.056721] ACPI: RSDP 0x00000000BFBFA014 000024 (v02 BOCHS )
> [    0.057874] ACPI: XSDT 0x00000000BFBF90E8 00004C (v01 BOCHS BXPCFACP
> 00000001      01000013)
> [    0.059590] ACPI: FACP 0x00000000BFBF5000 000074 (v01 BOCHS BXPCFACP
> 00000001 BXPC 00000001)
> [    0.061306] ACPI: DSDT 0x00000000BFBF6000 00238D (v01 BOCHS BXPCDSDT
> 00000001 BXPC 00000001)
> [    0.063006] ACPI: FACS 0x00000000BFBFD000 000040
> [    0.063938] ACPI: APIC 0x00000000BFBF4000 000090 (v01 BOCHS BXPCAPIC
> 00000001 BXPC 00000001)
> [    0.065638] ACPI: HPET 0x00000000BFBF3000 000038 (v01 BOCHS BXPCHPET
> 00000001 BXPC 00000001)
> [    0.067335] ACPI: BGRT 0x00000000BE49B000 000038 (v01 INTEL EDK2    
> 00000002      01000013)
> [    0.069030] ACPI: iBFT 0x00000000BE453000 000800 (v01 BOCHS BXPCFACP
> 00000000      00000000)
> [    0.070734] XXX acpi_find_ibft_region:
> [    0.071468] XXX iBFT, status=0
> [    0.072073] XXX about to call acpi_put_table()...
> ibft_addr=ffffffffff240000
> [    0.073449] XXX acpi_find_ibft_region(EXIT):
> PANIC: early exception 0x0e IP 10:ffffffff9259f439 error 0 cr2
> 0xffffffffff240004

Right, I've missed the dereference of the ibft_addr after
acpi_find_ibft_region().

With this change to iscsi_ibft_find.c instead of the previous one it should
be better:

diff --git a/drivers/firmware/iscsi_ibft_find.c b/drivers/firmware/iscsi_ibft_find.c
index 64bb94523281..1be7481d5c69 100644
--- a/drivers/firmware/iscsi_ibft_find.c
+++ b/drivers/firmware/iscsi_ibft_find.c
@@ -80,6 +80,27 @@ static int __init find_ibft_in_mem(void)
done:
return len;
}
+
+static void __init acpi_find_ibft_region(unsigned long *sizep)
+{
+ int i;
+ struct acpi_table_header *table = NULL;
+ acpi_status status;
+
+ if (acpi_disabled)
+ return;
+
+ for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) {
+ status = acpi_get_table(ibft_signs[i].sign, 0, &table);
+ if (ACPI_SUCCESS(status)) {
+ ibft_addr = (struct acpi_table_ibft *)table;
+ *sizep = PAGE_ALIGN(ibft_addr->header.length);
+ acpi_put_table(table);
+ break;
+ }
+ }
+}
+
/*
* Routine used to find the iSCSI Boot Format Table. The logical
* kernel address is set in the ibft_addr global variable.
@@ -91,14 +112,16 @@ unsigned long __init find_ibft_region(unsigned long *sizep)
/* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will
* only use ACPI for this */

- if (!efi_enabled(EFI_BOOT))
+ if (!efi_enabled(EFI_BOOT)) {
find_ibft_in_mem();
-
- if (ibft_addr) {
*sizep = PAGE_ALIGN(ibft_addr->header.length);
- return (u64)virt_to_phys(ibft_addr);
+ } else {
+ acpi_find_ibft_region(sizep);
}

+ if (ibft_addr)
+ return (u64)virt_to_phys(ibft_addr);
+
*sizep = 0;
return 0;
}
> [    0.075711] CPU: 0 PID: 0 Comm: swapper Not tainted 5.11.0-34a2105 #8
> [    0.076983] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> 0.0.0 02/06/2015
> [    0.078579] RIP: 0010:find_ibft_region+0x470/0x577

--
Sincerely yours,
Mike.

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