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Date: Tue, 23 Feb 2021 16:16:44 -0500
From: George Kennedy <george.kennedy@...cle.com>
To: Mike Rapoport <rppt@...ux.ibm.com>
Cc: David Hildenbrand <david@...hat.com>,
Andrey Konovalov <andreyknvl@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Catalin Marinas <catalin.marinas@....com>,
Vincenzo Frascino <vincenzo.frascino@....com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Konrad Rzeszutek Wilk <konrad@...nok.org>,
Will Deacon <will.deacon@....com>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Alexander Potapenko <glider@...gle.com>,
Marco Elver <elver@...gle.com>,
Peter Collingbourne <pcc@...gle.com>,
Evgenii Stepanov <eugenis@...gle.com>,
Branislav Rankov <Branislav.Rankov@....com>,
Kevin Brodsky <kevin.brodsky@....com>,
Christoph Hellwig <hch@...radead.org>,
kasan-dev <kasan-dev@...glegroups.com>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
Linux Memory Management List <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>,
Dhaval Giani <dhaval.giani@...cle.com>
Subject: Re: [PATCH] mm, kasan: don't poison boot memory
On 2/23/2021 3:09 PM, Mike Rapoport wrote:
> 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;
> }
Mike,
No luck. Back to the original KASAN ibft_init crash.
I ran with only the above patch from you. Was that what you wanted? Your
previous patch had a section defined out by #if 0. Was that supposed to
be in there as well?
See the attached console output.
This is all I ran with:
# git diff
diff --git a/drivers/firmware/iscsi_ibft_find.c
b/drivers/firmware/iscsi_ibft_find.c
index 64bb945..1be7481 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;
}
Thank you,
George
>> [ 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
View attachment "console.out.mike2_patch_fail" of type "text/plain" (102210 bytes)
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