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From: "Gao, Zhichao" <zhichao.gao@intel.com>
To: "devel@edk2.groups.io" <devel@edk2.groups.io>,
	"krzysztof.koch@arm.com" <krzysztof.koch@arm.com>
Cc: "Carsey, Jaben" <jaben.carsey@intel.com>,
	"Ni, Ray" <ray.ni@intel.com>,
	"Sami.Mujawar@arm.com" <Sami.Mujawar@arm.com>,
	"Matteo.Carlini@arm.com" <Matteo.Carlini@arm.com>,
	"nd@arm.com" <nd@arm.com>
Subject: Re: [edk2-devel] [PATCH v1 05/11] ShellPkg: acpiview: SLIT: Validate System Locality count
Date: Mon, 19 Aug 2019 01:18:30 +0000	[thread overview]
Message-ID: <3CE959C139B4C44DBEA1810E3AA6F9000B82386D@SHSMSX101.ccr.corp.intel.com> (raw)
In-Reply-To: <20190815131121.52644-6-krzysztof.koch@arm.com>



> -----Original Message-----
> From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On Behalf Of
> Krzysztof Koch
> Sent: Thursday, August 15, 2019 9:11 PM
> To: devel@edk2.groups.io
> Cc: Carsey, Jaben <jaben.carsey@intel.com>; Ni, Ray <ray.ni@intel.com>;
> Gao, Zhichao <zhichao.gao@intel.com>; Sami.Mujawar@arm.com;
> Matteo.Carlini@arm.com; nd@arm.com
> Subject: [edk2-devel] [PATCH v1 05/11] ShellPkg: acpiview: SLIT: Validate
> System Locality count
> 
> 1. Check if the 'Number of System Localities' provided can be represented in
> the SLIT table. The table 'Length' field is a 32-bit value while the 'Number of
> System Localities' field is 64-bit long.
> 
> 2. Check if the SLIT matrix fits in the table buffer. If N is the SLIT locality count,
> then the matrix used to represent the localities is N*N bytes long. The ACPI
> table length must be big enough to fit the matrix.
> 
> 3. Remove (now) redundant 64x64 bit multiplication.

Why removing? This change is added to fixed the issue build error with IA32 multiplication of two 64 bits data.
The change of #3 should be removed from the patch.
Keeping the variable size as UINT64 wouldn't affect the result.

Thanks,
Zhichao

> 
> Signed-off-by: Krzysztof Koch <krzysztof.koch@arm.com>
> ---
> 
> Notes:
>     v1:
>     - Validate the 'Number of System Localities' Field [Krzysztof]
>     - Remove redundant 64x64 bit multiplication [Krzysztof]
> 
>  ShellPkg/Library/UefiShellAcpiViewCommandLib/Parsers/Slit/SlitParser.c |
> 47 +++++++++++++++++---
>  1 file changed, 42 insertions(+), 5 deletions(-)
> 
> diff --git
> a/ShellPkg/Library/UefiShellAcpiViewCommandLib/Parsers/Slit/SlitParser.c
> b/ShellPkg/Library/UefiShellAcpiViewCommandLib/Parsers/Slit/SlitParser.c
> index
> 17e2166a09d8615b714e0c51d4d93d293fcdf601..e4625ee8b13907893a9b6990
> ecb956baf91cc3b9 100644
> ---
> a/ShellPkg/Library/UefiShellAcpiViewCommandLib/Parsers/Slit/SlitParser.c
> +++ b/ShellPkg/Library/UefiShellAcpiViewCommandLib/Parsers/Slit/SlitPars
> +++ er.c
> @@ -30,7 +30,7 @@ STATIC CONST ACPI_PARSER SlitParser[] = {
>  /**
>    Macro to get the value of a System Locality  **/ -#define
> SLIT_ELEMENT(Ptr, i, j) *(Ptr + (MultU64x64 (i, LocalityCount)) + j)
> +#define SLIT_ELEMENT(Ptr, i, j) *(Ptr + (i * LocalityCount) + j)
> 
>  /**
>    This function parses the ACPI SLIT table.
> @@ -57,9 +57,9 @@ ParseAcpiSlit (
>    )
>  {
>    UINT32 Offset;
> -  UINT64 Count;
> -  UINT64 Index;
> -  UINT64 LocalityCount;
> +  UINT32 Count;
> +  UINT32 Index;
> +  UINT32 LocalityCount;
>    UINT8* LocalityPtr;
>    CHAR16 Buffer[80];  // Used for AsciiName param of ParseAcpi
> 
> @@ -87,8 +87,45 @@ ParseAcpiSlit (
>      return;
>    }
> 
> +  /*
> +    Despite the 'Number of System Localities' being a 64-bit field in SLIT,
> +    the maximum number of localities that can be represented in SLIT is
> limited
> +    by the 'Length' field of the ACPI table.
> +
> +    Since the ACPI table length field is 32-bit wide. The maximum number of
> +    localities that can be represented in SLIT can be calculated as:
> +
> +    MaxLocality = sqrt (MAX_UINT32 - sizeof
> (EFI_ACPI_6_3_SYSTEM_LOCALITY_DISTANCE_INFORMATION_TABLE_HEAD
> ER))
> +                = 65535
> +                = MAX_UINT16
> +  */
> +  if (*SlitSystemLocalityCount > MAX_UINT16) {
> +    IncrementErrorCount ();
> +    Print (
> +      L"ERROR: The Number of System Localities provided can't be
> represented " \
> +        L"in the SLIT table. SlitSystemLocalityCount = %ld. " \
> +        L"MaxLocalityCountAllowed = %d.\n",
> +      *SlitSystemLocalityCount,
> +      MAX_UINT16
> +      );
> +    return;
> +  }
> +
> +  LocalityCount = (UINT32)*SlitSystemLocalityCount;
> +
> +  // Make sure system localities fit in the table buffer provided  if
> + (Offset + (LocalityCount * LocalityCount) > AcpiTableLength) {
> +    IncrementErrorCount ();
> +    Print (
> +      L"ERROR: Invalid Number of System Localities. " \
> +        L"SlitSystemLocalityCount = %ld. AcpiTableLength = %d.\n",
> +      *SlitSystemLocalityCount,
> +      AcpiTableLength
> +      );
> +    return;
> +  }
> +
>    LocalityPtr = Ptr + Offset;
> -  LocalityCount = *SlitSystemLocalityCount;
> 
>    // We only print the Localities if the count is less than 16
>    // If the locality count is more than 16 then refer to the
> --
> 'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)'
> 
> 
> 
> 


  reply	other threads:[~2019-08-19  1:18 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-15 13:11 [PATCH v1 00/11] Test against invalid pointers in acpiview Krzysztof Koch
2019-08-15 13:11 ` [PATCH v1 01/11] ShellPkg: acpiview: Set ItemPtr to NULL for unprocessed table fields Krzysztof Koch
2019-08-15 13:11 ` [PATCH v1 02/11] ShellPkg: acpiview: RSDP: Validate global pointer before use Krzysztof Koch
2019-08-15 13:11 ` [PATCH v1 03/11] ShellPkg: acpiview: FADT: " Krzysztof Koch
2019-08-16  7:34   ` Gao, Zhichao
2019-08-16 10:25     ` Krzysztof Koch
2019-08-15 13:11 ` [PATCH v1 04/11] ShellPkg: acpiview: SLIT: " Krzysztof Koch
2019-08-15 13:11 ` [PATCH v1 05/11] ShellPkg: acpiview: SLIT: Validate System Locality count Krzysztof Koch
2019-08-19  1:18   ` Gao, Zhichao [this message]
2019-08-19  6:28     ` [edk2-devel] " Krzysztof Koch
2019-08-19  7:16       ` Gao, Zhichao
2019-08-19  9:30   ` Sami Mujawar
2019-08-15 13:11 ` [PATCH v1 06/11] ShellPkg: acpiview: SRAT: Validate global pointers before use Krzysztof Koch
2019-08-15 13:11 ` [PATCH v1 07/11] ShellPkg: acpiview: MADT: " Krzysztof Koch
2019-08-15 13:11 ` [PATCH v1 08/11] ShellPkg: acpiview: PPTT: " Krzysztof Koch
2019-08-15 13:11 ` [PATCH v1 09/11] ShellPkg: acpiview: IORT: " Krzysztof Koch
2019-08-15 13:11 ` [PATCH v1 10/11] ShellPkg: acpiview: GTDT: " Krzysztof Koch
2019-08-15 13:11 ` [PATCH v1 11/11] ShellPkg: acpiview: DBG2: " Krzysztof Koch
2019-08-16  4:02 ` [edk2-devel] [PATCH v1 00/11] Test against invalid pointers in acpiview Liming Gao
2019-08-16  7:21   ` Krzysztof Koch
2019-08-19  9:29 ` Sami Mujawar
2019-08-21  1:46 ` [edk2-devel] " Gao, Zhichao

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