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Fri, 26 Feb 2021 01:19:23 +0000 Subject: Re: [PATCH] mm, kasan: don't poison boot memory From: George Kennedy To: Mike Rapoport Cc: David Hildenbrand , Andrey Konovalov , Andrew Morton , Catalin Marinas , Vincenzo Frascino , Dmitry Vyukov , Konrad Rzeszutek Wilk , Will Deacon , Andrey Ryabinin , Alexander Potapenko , Marco Elver , Peter Collingbourne , Evgenii Stepanov , Branislav Rankov , Kevin Brodsky , Christoph Hellwig , kasan-dev , Linux ARM , Linux Memory Management List , LKML , Dhaval Giani References: <20210223200914.GH1741768@linux.ibm.com> <20210223213237.GI1741768@linux.ibm.com> <450a9895-a2b4-d11b-97ca-1bd33d5308d4@oracle.com> <20210224103754.GA1854360@linux.ibm.com> <9b7251d1-7b90-db4f-fa5e-80165e1cbb4b@oracle.com> <20210225085300.GB1854360@linux.ibm.com> <9973d0e2-e28b-3f8a-5f5d-9d142080d141@oracle.com> <20210225145700.GC1854360@linux.ibm.com> <20210225160706.GD1854360@linux.ibm.com> <6000e7fd-bf8b-b9b0-066d-23661da8a51d@oracle.com> Organization: Oracle Corporation Message-ID: Date: Thu, 25 Feb 2021 20:19:18 -0500 User-Agent: Mozilla/5.0 (Windows NT 10.0; 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identity=mailfrom; envelope-from=""; helo=userp2130.oracle.com; client-ip=156.151.31.86 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1614302392-250526 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 2/25/2021 12:33 PM, George Kennedy wrote: > > > On 2/25/2021 11:07 AM, Mike Rapoport wrote: >> On Thu, Feb 25, 2021 at 10:22:44AM -0500, George Kennedy wrote: >>>>>>> On 2/24/2021 5:37 AM, Mike Rapoport wrote: >>> Applied just your latest patch, but same failure. >>> >>> I thought there was an earlier comment (which I can't find now) that=20 >>> stated >>> that memblock_reserve() wouldn't reserve the page, which is what's=20 >>> needed >>> here. >> Actually, I think that memblock_reserve() should be just fine, but it=20 >> seems >> I'm missing something in address calculation each time. >> >> What would happen if you stuck >> >> =C2=A0=C2=A0=C2=A0=C2=A0memblock_reserve(0xbe453000, PAGE_SIZE); >> >> say, at the beginning of find_ibft_region()? > > Good news Mike! > > The above hack in yesterday's last patch works - 10 successful=20 > reboots. See: "BE453" below for the hack. > > I'll modify the patch to use "table_desc->address" instead, which is=20 > the physical address of the table. > > diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c > index 7bdc023..c118dd5 100644 > --- a/arch/x86/kernel/acpi/boot.c > +++ b/arch/x86/kernel/acpi/boot.c > @@ -1551,6 +1551,7 @@ void __init acpi_boot_table_init(void) > =C2=A0=C2=A0=C2=A0=C2=A0 if (acpi_disabled) > =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 return; > > +#if 0 > =C2=A0=C2=A0=C2=A0=C2=A0 /* > =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0* Initialize the ACPI boot-time table pa= rser. > =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0*/ > @@ -1558,6 +1559,7 @@ void __init acpi_boot_table_init(void) > =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 disable_acpi(); > =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 return; > =C2=A0=C2=A0=C2=A0=C2=A0 } > +#endif > > =C2=A0=C2=A0=C2=A0=C2=A0 acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf= ); > > diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c > index 740f3bdb..b045ab2 100644 > --- a/arch/x86/kernel/setup.c > +++ b/arch/x86/kernel/setup.c > @@ -571,16 +571,6 @@ void __init reserve_standard_io_resources(void) > > =C2=A0} > > -static __init void reserve_ibft_region(void) > -{ > -=C2=A0=C2=A0=C2=A0 unsigned long addr, size =3D 0; > - > -=C2=A0=C2=A0=C2=A0 addr =3D find_ibft_region(&size); > - > -=C2=A0=C2=A0=C2=A0 if (size) > -=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 memblock_reserve(addr, size); > -} > - > =C2=A0static bool __init snb_gfx_workaround_needed(void) > =C2=A0{ > =C2=A0#ifdef CONFIG_PCI > @@ -1033,6 +1023,12 @@ void __init setup_arch(char **cmdline_p) > =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0*/ > =C2=A0=C2=A0=C2=A0=C2=A0 find_smp_config(); > > +=C2=A0=C2=A0=C2=A0 /* > +=C2=A0=C2=A0=C2=A0 =C2=A0* Initialize the ACPI boot-time table parser. > +=C2=A0=C2=A0=C2=A0 =C2=A0*/ > +=C2=A0=C2=A0=C2=A0 if (acpi_table_init()) > +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 disable_acpi(); > + > =C2=A0=C2=A0=C2=A0=C2=A0 reserve_ibft_region(); > > =C2=A0=C2=A0=C2=A0=C2=A0 early_alloc_pgt_buf(); > diff --git a/drivers/firmware/iscsi_ibft_find.c=20 > b/drivers/firmware/iscsi_ibft_find.c > index 64bb945..95fc1a6 100644 > --- a/drivers/firmware/iscsi_ibft_find.c > +++ b/drivers/firmware/iscsi_ibft_find.c > @@ -47,7 +47,25 @@ > =C2=A0#define VGA_MEM 0xA0000 /* VGA buffer */ > =C2=A0#define VGA_SIZE 0x20000 /* 128kB */ > > -static int __init find_ibft_in_mem(void) > +static void __init *acpi_find_ibft_region(void) > +{ > +=C2=A0=C2=A0=C2=A0 int i; > +=C2=A0=C2=A0=C2=A0 struct acpi_table_header *table =3D NULL; > +=C2=A0=C2=A0=C2=A0 acpi_status status; > + > +=C2=A0=C2=A0=C2=A0 if (acpi_disabled) > +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 return NULL; > + > +=C2=A0=C2=A0=C2=A0 for (i =3D 0; i < ARRAY_SIZE(ibft_signs) && !ibft_a= ddr; i++) { > +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 status =3D acpi_get_table(ibft_s= igns[i].sign, 0, &table); > +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 if (ACPI_SUCCESS(status)) > +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 return table; > +=C2=A0=C2=A0=C2=A0 } > + > +=C2=A0=C2=A0=C2=A0 return NULL; > +} > + > +static void __init *find_ibft_in_mem(void) > =C2=A0{ > =C2=A0=C2=A0=C2=A0=C2=A0 unsigned long pos; > =C2=A0=C2=A0=C2=A0=C2=A0 unsigned int len =3D 0; > @@ -70,35 +88,52 @@ static int __init find_ibft_in_mem(void) > =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2= =A0=C2=A0 /* if the length of the table extends past 1M, > =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2= =A0=C2=A0 =C2=A0* the table cannot be valid. */ > =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2= =A0=C2=A0 if (pos + len <=3D (IBFT_END-1)) { > -=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2= =A0 =C2=A0=C2=A0=C2=A0 ibft_addr =3D (struct acpi_table_ibft *)virt; > =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2= =A0=C2=A0 =C2=A0=C2=A0=C2=A0 pr_info("iBFT found at 0x%lx.\n", pos); > -=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2= =A0 =C2=A0=C2=A0=C2=A0 goto done; > +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2= =A0 =C2=A0=C2=A0=C2=A0 return virt; > =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2= =A0=C2=A0 } > =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 } > =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 } > =C2=A0=C2=A0=C2=A0=C2=A0 } > -done: > -=C2=A0=C2=A0=C2=A0 return len; > + > +=C2=A0=C2=A0=C2=A0 return NULL; > =C2=A0} > + > +static void __init *find_ibft(void) > +{ > +=C2=A0=C2=A0=C2=A0 /* iBFT 1.03 section 1.4.3.1 mandates that UEFI mac= hines will > +=C2=A0=C2=A0=C2=A0 =C2=A0* only use ACPI for this */ > +=C2=A0=C2=A0=C2=A0 if (!efi_enabled(EFI_BOOT)) > +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 return find_ibft_in_mem(); > +=C2=A0=C2=A0=C2=A0 else > +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 return acpi_find_ibft_region(); > +} > + > =C2=A0/* > =C2=A0 * Routine used to find the iSCSI Boot Format Table. The logical > =C2=A0 * kernel address is set in the ibft_addr global variable. > =C2=A0 */ > -unsigned long __init find_ibft_region(unsigned long *sizep) > +void __init reserve_ibft_region(void) > =C2=A0{ > -=C2=A0=C2=A0=C2=A0 ibft_addr =3D NULL; > +=C2=A0=C2=A0=C2=A0 struct acpi_table_ibft *table; > +=C2=A0=C2=A0=C2=A0 unsigned long size; > > -=C2=A0=C2=A0=C2=A0 /* iBFT 1.03 section 1.4.3.1 mandates that UEFI mac= hines will > -=C2=A0=C2=A0=C2=A0 =C2=A0* only use ACPI for this */ > +=C2=A0=C2=A0=C2=A0 table =3D find_ibft(); > +=C2=A0=C2=A0=C2=A0 if (!table) > +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 return; > > -=C2=A0=C2=A0=C2=A0 if (!efi_enabled(EFI_BOOT)) > -=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 find_ibft_in_mem(); > - > -=C2=A0=C2=A0=C2=A0 if (ibft_addr) { > -=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 *sizep =3D PAGE_ALIGN(ibft_addr-= >header.length); > -=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 return (u64)virt_to_phys(ibft_ad= dr); > -=C2=A0=C2=A0=C2=A0 } > +=C2=A0=C2=A0=C2=A0 size =3D PAGE_ALIGN(table->header.length); > +#if 0 > +printk(KERN_ERR "XXX reserve_ibft_region: table=3D%llx,=20 > virt_to_phys(table)=3D%llx, size=3D%lx\n", > +=C2=A0=C2=A0=C2=A0 (u64)table, virt_to_phys(table), size); > +=C2=A0=C2=A0=C2=A0 memblock_reserve(virt_to_phys(table), size); > +#else > +printk(KERN_ERR "XXX reserve_ibft_region: table=3D%llx,=20 > 0x00000000BE453000, size=3D%lx\n", > +=C2=A0=C2=A0=C2=A0 (u64)table, size); > +=C2=A0=C2=A0=C2=A0 memblock_reserve(0x00000000BE453000, size); > +#endif > > -=C2=A0=C2=A0=C2=A0 *sizep =3D 0; > -=C2=A0=C2=A0=C2=A0 return 0; > +=C2=A0=C2=A0=C2=A0 if (efi_enabled(EFI_BOOT)) > +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 acpi_put_table(&table->header); > +=C2=A0=C2=A0=C2=A0 else > +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 ibft_addr =3D table; > =C2=A0} > diff --git a/include/linux/iscsi_ibft.h b/include/linux/iscsi_ibft.h > index b7b45ca..da813c8 100644 > --- a/include/linux/iscsi_ibft.h > +++ b/include/linux/iscsi_ibft.h > @@ -26,13 +26,9 @@ > =C2=A0 * mapped address is set in the ibft_addr variable. > =C2=A0 */ > =C2=A0#ifdef CONFIG_ISCSI_IBFT_FIND > -unsigned long find_ibft_region(unsigned long *sizep); > +void reserve_ibft_region(void); > =C2=A0#else > -static inline unsigned long find_ibft_region(unsigned long *sizep) > -{ > -=C2=A0=C2=A0=C2=A0 *sizep =3D 0; > -=C2=A0=C2=A0=C2=A0 return 0; > -} > +static inline void reserve_ibft_region(void) {} > =C2=A0#endif > > =C2=A0#endif /* ISCSI_IBFT_H */ Mike, To get rid of the 0x00000000BE453000 hardcoding, I added the following=20 patch to your above patch to get the iBFT table "address" to use with=20 memblock_reserve(): diff --git a/drivers/acpi/acpica/tbfind.c b/drivers/acpi/acpica/tbfind.c index 56d81e4..4bc7bf3 100644 --- a/drivers/acpi/acpica/tbfind.c +++ b/drivers/acpi/acpica/tbfind.c @@ -120,3 +120,34 @@ =C2=A0=C2=A0=C2=A0=C2=A0 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); =C2=A0=C2=A0=C2=A0=C2=A0 return_ACPI_STATUS(status); =C2=A0} + +acpi_physical_address +acpi_tb_find_table_address(char *signature) +{ +=C2=A0=C2=A0=C2=A0 acpi_physical_address address =3D 0; +=C2=A0=C2=A0=C2=A0 struct acpi_table_desc *table_desc; +=C2=A0=C2=A0=C2=A0 int i; + +=C2=A0=C2=A0=C2=A0 ACPI_FUNCTION_TRACE(tb_find_table_address); + +printk(KERN_ERR "XXX acpi_tb_find_table_address: signature=3D%s\n",=20 signature); + +=C2=A0=C2=A0=C2=A0 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); +=C2=A0=C2=A0=C2=A0 for (i =3D 0; i < acpi_gbl_root_table_list.current_ta= ble_count; ++i) { +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 if (memcmp(&(acpi_gbl_root_table_l= ist.tables[i].signature), +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0 si= gnature, ACPI_NAMESEG_SIZE)) { + +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 /* Not the requ= ested table */ + +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 continue; +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 } + +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 /* Table with matching signature h= as been found */ +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 table_desc =3D &acpi_gbl_root_tabl= e_list.tables[i]; +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 address =3D table_desc->address; +=C2=A0=C2=A0=C2=A0 } + +=C2=A0=C2=A0=C2=A0 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); +printk(KERN_ERR "XXX acpi_tb_find_table_address(EXIT): address=3D%llx\n"= ,=20 address); +=C2=A0=C2=A0=C2=A0 return address; +} diff --git a/drivers/firmware/iscsi_ibft_find.c=20 b/drivers/firmware/iscsi_ibft_find.c index 95fc1a6..0de70b4 100644 --- a/drivers/firmware/iscsi_ibft_find.c +++ b/drivers/firmware/iscsi_ibft_find.c @@ -28,6 +28,8 @@ =C2=A0#include +extern acpi_physical_address acpi_tb_find_table_address(char *signature)= ; + =C2=A0/* =C2=A0 * Physical location of iSCSI Boot Format Table. =C2=A0 */ @@ -116,24 +118,32 @@ void __init reserve_ibft_region(void) =C2=A0{ =C2=A0=C2=A0=C2=A0=C2=A0 struct acpi_table_ibft *table; =C2=A0=C2=A0=C2=A0=C2=A0 unsigned long size; +=C2=A0=C2=A0=C2=A0 acpi_physical_address address; =C2=A0=C2=A0=C2=A0=C2=A0 table =3D find_ibft(); =C2=A0=C2=A0=C2=A0=C2=A0 if (!table) =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 return; =C2=A0=C2=A0=C2=A0=C2=A0 size =3D PAGE_ALIGN(table->header.length); +=C2=A0=C2=A0=C2=A0 address =3D acpi_tb_find_table_address(table->header.= signature); =C2=A0#if 0 =C2=A0printk(KERN_ERR "XXX reserve_ibft_region: table=3D%llx,=20 virt_to_phys(table)=3D%llx, size=3D%lx\n", =C2=A0=C2=A0=C2=A0=C2=A0 (u64)table, virt_to_phys(table), size); =C2=A0=C2=A0=C2=A0=C2=A0 memblock_reserve(virt_to_phys(table), size); =C2=A0#else -printk(KERN_ERR "XXX reserve_ibft_region: table=3D%llx,=20 0x00000000BE453000, size=3D%lx\n", -=C2=A0=C2=A0=C2=A0 (u64)table, size); -=C2=A0=C2=A0=C2=A0 memblock_reserve(0x00000000BE453000, size); +printk(KERN_ERR "XXX reserve_ibft_region: table=3D%llx, address=3D%llx,=20 size=3D%lx\n", +=C2=A0=C2=A0=C2=A0 (u64)table, address, size); +=C2=A0=C2=A0=C2=A0 if (address) +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 memblock_reserve(address, size); +=C2=A0=C2=A0=C2=A0 else +=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 printk(KERN_ERR "%s: Can't find ta= ble address\n", __func__); =C2=A0#endif -=C2=A0=C2=A0=C2=A0 if (efi_enabled(EFI_BOOT)) +=C2=A0=C2=A0=C2=A0 if (efi_enabled(EFI_BOOT)) { +printk(KERN_ERR "XXX reserve_ibft_region: calling=20 acpi_put_table(%llx)\n", (u64)&table->header); =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 acpi_put_table(&table->heade= r); -=C2=A0=C2=A0=C2=A0 else +=C2=A0=C2=A0=C2=A0 } else { =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 ibft_addr =3D table; +printk(KERN_ERR "XXX reserve_ibft_region: ibft_addr=3D%llx\n",=20 (u64)ibft_addr); +=C2=A0=C2=A0=C2=A0 } =C2=A0} Debug from the above: [=C2=A0=C2=A0=C2=A0 0.050646] ACPI: Early table checksum verification dis= abled [=C2=A0=C2=A0=C2=A0 0.051778] ACPI: RSDP 0x00000000BFBFA014 000024 (v02 B= OCHS ) [=C2=A0=C2=A0=C2=A0 0.052922] ACPI: XSDT 0x00000000BFBF90E8 00004C (v01 B= OCHS BXPCFACP=20 00000001=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 01000013) [=C2=A0=C2=A0=C2=A0 0.054623] ACPI: FACP 0x00000000BFBF5000 000074 (v01 B= OCHS BXPCFACP=20 00000001 BXPC 00000001) [=C2=A0=C2=A0=C2=A0 0.056326] ACPI: DSDT 0x00000000BFBF6000 00238D (v01 B= OCHS BXPCDSDT=20 00000001 BXPC 00000001) [=C2=A0=C2=A0=C2=A0 0.058016] ACPI: FACS 0x00000000BFBFD000 000040 [=C2=A0=C2=A0=C2=A0 0.058940] ACPI: APIC 0x00000000BFBF4000 000090 (v01 B= OCHS BXPCAPIC=20 00000001 BXPC 00000001) [=C2=A0=C2=A0=C2=A0 0.060627] ACPI: HPET 0x00000000BFBF3000 000038 (v01 B= OCHS BXPCHPET=20 00000001 BXPC 00000001) [=C2=A0=C2=A0=C2=A0 0.062304] ACPI: BGRT 0x00000000BE49B000 000038 (v01 I= NTEL EDK2=C2=A0=C2=A0=C2=A0=C2=A0=20 00000002=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 01000013) [=C2=A0=C2=A0=C2=A0 0.063987] ACPI: iBFT 0x00000000BE453000 000800 (v01 B= OCHS BXPCFACP=20 00000000=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 00000000) [=C2=A0=C2=A0=C2=A0 0.065683] XXX acpi_tb_find_table_address: signature=3D= iBFT [=C2=A0=C2=A0=C2=A0 0.066754] XXX acpi_tb_find_table_address(EXIT): addre= ss=3Dbe453000 [=C2=A0=C2=A0=C2=A0 0.067959] XXX reserve_ibft_region: table=3Dffffffffff= 240000,=20 address=3Dbe453000, size=3D1000 [=C2=A0=C2=A0=C2=A0 0.069534] XXX reserve_ibft_region: calling=20 acpi_put_table(ffffffffff240000) Not sure if it's the right thing to do, but added=20 "acpi_tb_find_table_address()" to return the physical address of a table=20 to use with memblock_reserve(). virt_to_phys(table) does not seem to return the physical address for the=20 iBFT table (it would be nice if struct acpi_table_header also had a=20 "address" element for the physical address of the table). Ran 10 successful boots with the above without failure. George > > > Debug from the above: > > [=C2=A0=C2=A0=C2=A0 0.020293] last_pfn =3D 0xbfedc max_arch_pfn =3D 0x4= 00000000 > [=C2=A0=C2=A0=C2=A0 0.050778] ACPI: Early table checksum verification d= isabled > [=C2=A0=C2=A0=C2=A0 0.056475] ACPI: RSDP 0x00000000BFBFA014 000024 (v02= BOCHS ) > [=C2=A0=C2=A0=C2=A0 0.057628] ACPI: XSDT 0x00000000BFBF90E8 00004C (v01= BOCHS=20 > BXPCFACP 00000001=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 01000013) > [=C2=A0=C2=A0=C2=A0 0.059341] ACPI: FACP 0x00000000BFBF5000 000074 (v01= BOCHS=20 > BXPCFACP 00000001 BXPC 00000001) > [=C2=A0=C2=A0=C2=A0 0.061043] ACPI: DSDT 0x00000000BFBF6000 00238D (v01= BOCHS=20 > BXPCDSDT 00000001 BXPC 00000001) > [=C2=A0=C2=A0=C2=A0 0.062740] ACPI: FACS 0x00000000BFBFD000 000040 > [=C2=A0=C2=A0=C2=A0 0.063673] ACPI: APIC 0x00000000BFBF4000 000090 (v01= BOCHS=20 > BXPCAPIC 00000001 BXPC 00000001) > [=C2=A0=C2=A0=C2=A0 0.065369] ACPI: HPET 0x00000000BFBF3000 000038 (v01= BOCHS=20 > BXPCHPET 00000001 BXPC 00000001) > [=C2=A0=C2=A0=C2=A0 0.067061] ACPI: BGRT 0x00000000BE49B000 000038 (v01= INTEL=20 > EDK2=C2=A0=C2=A0=C2=A0=C2=A0 00000002=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 010= 00013) > [=C2=A0=C2=A0=C2=A0 0.068761] ACPI: iBFT 0x00000000BE453000 000800 (v01= BOCHS=20 > BXPCFACP 00000000=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 00000000) > [=C2=A0=C2=A0=C2=A0 0.070461] XXX reserve_ibft_region: table=3Dffffffff= ff240000,=20 > 0x00000000BE453000, size=3D1000 > [=C2=A0=C2=A0=C2=A0 0.072231] check: Scanning 1 areas for low memory co= rruption > > George >>> [=C2=A0=C2=A0 30.308229] iBFT detected.. >>> [=C2=A0=C2=A0 30.308796] >>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >>> [=C2=A0=C2=A0 30.308890] BUG: KASAN: use-after-free in ibft_init+0x13= 4/0xc33 >>> [=C2=A0=C2=A0 30.308890] Read of size 4 at addr ffff8880be453004 by t= ask=20 >>> swapper/0/1 >>> [=C2=A0=C2=A0 30.308890] >>> [=C2=A0=C2=A0 30.308890] CPU: 1 PID: 1 Comm: swapper/0 Not tainted=20 >>> 5.11.0-f9593a0 #12 >>> [=C2=A0=C2=A0 30.308890] Hardware name: QEMU Standard PC (i440FX + PI= IX,=20 >>> 1996), BIOS >>> 0.0.0 02/06/2015 >>> [=C2=A0=C2=A0 30.308890] Call Trace: >>> [=C2=A0=C2=A0 30.308890]=C2=A0 dump_stack+0xdb/0x120 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? ibft_init+0x134/0xc33 >>> [=C2=A0=C2=A0 30.308890] print_address_description.constprop.7+0x41/0= x60 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? ibft_init+0x134/0xc33 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? ibft_init+0x134/0xc33 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 kasan_report.cold.10+0x78/0xd1 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? ibft_init+0x134/0xc33 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 __asan_report_load_n_noabort+0xf/0x20 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ibft_init+0x134/0xc33 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? write_comp_data+0x2f/0x90 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? ibft_check_initiator_for+0x159/0x159 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? write_comp_data+0x2f/0x90 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? ibft_check_initiator_for+0x159/0x159 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 do_one_initcall+0xc4/0x3e0 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? perf_trace_initcall_level+0x3e0/0x3e= 0 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? unpoison_range+0x14/0x40 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? ____kasan_kmalloc.constprop.5+0x8f/0= xc0 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? kernel_init_freeable+0x420/0x652 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? __kasan_kmalloc+0x9/0x10 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? __sanitizer_cov_trace_pc+0x21/0x50 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 kernel_init_freeable+0x596/0x652 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? console_on_rootfs+0x7d/0x7d >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? __sanitizer_cov_trace_pc+0x21/0x50 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? rest_init+0xf0/0xf0 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 kernel_init+0x16/0x1d0 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ? rest_init+0xf0/0xf0 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ret_from_fork+0x22/0x30 >>> [=C2=A0=C2=A0 30.308890] >>> [=C2=A0=C2=A0 30.308890] The buggy address belongs to the page: >>> [=C2=A0=C2=A0 30.308890] page:0000000001b7b17c refcount:0 mapcount:0 >>> mapping:0000000000000000 index:0x1 pfn:0xbe453 >>> [=C2=A0=C2=A0 30.308890] flags: 0xfffffc0000000() >>> [=C2=A0=C2=A0 30.308890] raw: 000fffffc0000000 ffffea0002ef9788 ffffe= a0002f91488 >>> 0000000000000000 >>> [=C2=A0=C2=A0 30.308890] raw: 0000000000000001 0000000000000000 00000= 000ffffffff >>> 0000000000000000 >>> [=C2=A0=C2=A0 30.308890] page dumped because: kasan: bad access detec= ted >>> [=C2=A0=C2=A0 30.308890] page_owner tracks the page as freed >>> [=C2=A0=C2=A0 30.308890] page last allocated via order 0, migratetype= Movable, >>> gfp_mask 0x100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO), pid 204, ts=20 >>> 28121288605 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 prep_new_page+0xfb/0x140 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 get_page_from_freelist+0x3503/0x5730 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 __alloc_pages_nodemask+0x2d8/0x650 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 alloc_pages_vma+0xe2/0x560 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 __handle_mm_fault+0x930/0x26c0 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 handle_mm_fault+0x1f9/0x810 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 do_user_addr_fault+0x6f7/0xca0 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 exc_page_fault+0xaf/0x1a0 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 asm_exc_page_fault+0x1e/0x30 >>> [=C2=A0=C2=A0 30.308890] page last free stack trace: >>> [=C2=A0=C2=A0 30.308890]=C2=A0 free_pcp_prepare+0x122/0x290 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 free_unref_page_list+0xe6/0x490 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 release_pages+0x2ed/0x1270 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 free_pages_and_swap_cache+0x245/0x2e0 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 tlb_flush_mmu+0x11e/0x680 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 tlb_finish_mmu+0xa6/0x3e0 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 exit_mmap+0x2b3/0x540 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 mmput+0x11d/0x450 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 do_exit+0xaa6/0x2d40 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 do_group_exit+0x128/0x340 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 __x64_sys_exit_group+0x43/0x50 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 do_syscall_64+0x37/0x50 >>> [=C2=A0=C2=A0 30.308890]=C2=A0 entry_SYSCALL_64_after_hwframe+0x44/0x= a9 >>> [=C2=A0=C2=A0 30.308890] >>> [=C2=A0=C2=A0 30.308890] Memory state around the buggy address: >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ffff8880be452f00: ff ff ff ff ff ff ff= ff ff ff ff=20 >>> ff ff ff >>> ff ff >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ffff8880be452f80: ff ff ff ff ff ff ff= ff ff ff ff=20 >>> ff ff ff >>> ff ff >>> [=C2=A0=C2=A0 30.308890] >ffff8880be453000: ff ff ff ff ff ff ff ff f= f ff ff=20 >>> ff ff ff >>> ff ff >>> [=C2=A0=C2=A0 30.308890]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ^ >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ffff8880be453080: ff ff ff ff ff ff ff= ff ff ff ff=20 >>> ff ff ff >>> ff ff >>> [=C2=A0=C2=A0 30.308890]=C2=A0 ffff8880be453100: ff ff ff ff ff ff ff= ff ff ff ff=20 >>> ff ff ff >>> ff ff >>> [=C2=A0=C2=A0 30.308890] >>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >>> >>> George >>> >