public inbox for devel@edk2.groups.io
 help / color / mirror / Atom feed
* [PATCH] DynamicTablesPkg: add validation for PcdNonBsaCompliant16550SerialHid
@ 2021-04-09 12:00 Joey Gouly
  2021-04-12 10:01 ` [edk2-devel] " Sami Mujawar
  0 siblings, 1 reply; 4+ messages in thread
From: Joey Gouly @ 2021-04-09 12:00 UTC (permalink / raw)
  To: devel; +Cc: joey.gouly, alexei.fedorov, sami.mujawar, samer.el-haj-mahmoud,
	nd

According to ACPI 6.4, 6.1.5 _HID states:

  - A valid PNP ID must be of the form "AAA####" where A is an uppercase
    letter and # is a hex digit.
  - A valid ACPI ID must be of the form "NNNN####" where N is an uppercase
    letter or a digit ('0'-'9') and # is a hex digit.

Signed-off-by: Joey Gouly <joey.goulyd@arm.com>
---

The changes can be seen at https://github.com/jgouly/edk2/tree/1645_non_sba_compliant_validation_v1

 DynamicTablesPkg/Include/Library/TableHelperLib.h                               | 38 +++++++++-
 DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPortFixupLib.c |  4 ++
 DynamicTablesPkg/Library/Common/TableHelperLib/TableHelper.c                    | 73 +++++++++++++++++++-
 3 files changed, 113 insertions(+), 2 deletions(-)

diff --git a/DynamicTablesPkg/Include/Library/TableHelperLib.h b/DynamicTablesPkg/Include/Library/TableHelperLib.h
index 099a0a4544e3d1f746d4be8533cb006786f11611..0f93cdbf08953af2377952ef616f760a51706170 100644
--- a/DynamicTablesPkg/Include/Library/TableHelperLib.h
+++ b/DynamicTablesPkg/Include/Library/TableHelperLib.h
@@ -1,6 +1,6 @@
 /** @file
 
-  Copyright (c) 2017 - 2020, Arm Limited. All rights reserved.<BR>
+  Copyright (c) 2017 - 2021, Arm Limited. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
@@ -12,6 +12,18 @@
 #ifndef TABLE_HELPER_LIB_H_
 #define TABLE_HELPER_LIB_H_
 
+/** Is a character upper case
+*/
+#define IS_UPPER_CHAR(x) ((x >= 'A') && (x <= 'Z'))
+
+/** Is a character a decimal digit
+*/
+#define IS_DIGIT(x) ((x >= '0') && (x <= '9'))
+
+/** Is a character an upper case hexadecimal digit
+*/
+#define IS_UPPER_HEX(x) (((x >= 'A') && (x <= 'F')) || IS_DIGIT (x))
+
 /** The GetCgfMgrInfo function gets the CM_STD_OBJ_CONFIGURATION_MANAGER_INFO
     object from the Configuration Manager.
 
@@ -120,4 +132,28 @@ AsciiFromHex (
   IN  UINT8   x
   );
 
+/** Check if a HID is a valid PNP ID.
+
+  @param     [in] Hid     The Hid to validate.
+
+  @retval    TRUE         The Hid is a valid PNP ID.
+  @retval    FALSE        The Hid is not a valid PNP ID.
+**/
+BOOLEAN
+IsValidPnpId (
+  IN  CONST CHAR8  * Hid
+  );
+
+/** Check if a HID is a valid ACPI ID.
+
+  @param     [in] Hid     The Hid to validate.
+
+  @retval    TRUE         The Hid is a valid ACPI ID.
+  @retval    FALSE        The Hid is not a valid ACPI ID.
+**/
+BOOLEAN
+IsValidAcpiId (
+  IN  CONST CHAR8  * Hid
+  );
+
 #endif // TABLE_HELPER_LIB_H_
diff --git a/DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPortFixupLib.c b/DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPortFixupLib.c
index 3c4356097c3bf25e8d1432b45ba8ca59d33e8d09..f2b4831ad596284476fb342148d9c1f62bc7f98b 100644
--- a/DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPortFixupLib.c
+++ b/DynamicTablesPkg/Library/Common/SsdtSerialPortFixupLib/SsdtSerialPortFixupLib.c
@@ -148,6 +148,10 @@ FixupIds (
       // If there is a non-BSA compliant HID, use that.
       NonBsaHid = (CONST CHAR8*)PcdGetPtr (PcdNonBsaCompliant16550SerialHid);
       if ((NonBsaHid != NULL) && (AsciiStrLen (NonBsaHid) != 0)) {
+        if (!(IsValidPnpId (NonBsaHid) || IsValidAcpiId (NonBsaHid))) {
+          return EFI_INVALID_PARAMETER;
+        }
+
         HidString = NonBsaHid;
         CidString = "";
       } else {
diff --git a/DynamicTablesPkg/Library/Common/TableHelperLib/TableHelper.c b/DynamicTablesPkg/Library/Common/TableHelperLib/TableHelper.c
index 0d9daad3b05b6e82089f92afb6de4eeee5af9a28..9830ce62b3cb94be6d861a09d8d8356d60fdfbba 100644
--- a/DynamicTablesPkg/Library/Common/TableHelperLib/TableHelper.c
+++ b/DynamicTablesPkg/Library/Common/TableHelperLib/TableHelper.c
@@ -1,7 +1,7 @@
 /** @file
   Table Helper
 
-  Copyright (c) 2017 - 2020, Arm Limited. All rights reserved.<BR>
+  Copyright (c) 2017 - 2021, Arm Limited. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 **/
@@ -270,3 +270,74 @@ AsciiFromHex (
   ASSERT (FALSE);
   return (UINT8)0;
 }
+
+/** Check if a HID is a valid PNP ID.
+
+  @param     [in] Hid     The Hid to validate.
+
+  @retval    TRUE         The Hid is a valid PNP ID.
+  @retval    FALSE        The Hid is not a valid PNP ID.
+**/
+BOOLEAN
+IsValidPnpId (
+  IN  CONST CHAR8  * Hid
+  )
+{
+  UINTN Index;
+
+  if (AsciiStrLen (Hid) != 7) {
+    return FALSE;
+  }
+
+  // A valid PNP ID must be of the form "AAA####"
+  // where A is an uppercase letter and # is a hex digit.
+  for (Index = 0; Index < 3; Index++) {
+    if (!IS_UPPER_CHAR (Hid[Index])) {
+      return FALSE;
+    }
+  }
+
+  for (Index = 3; Index < 7; Index++) {
+    if (!IS_UPPER_HEX (Hid[Index])) {
+      return FALSE;
+    }
+  }
+
+  return TRUE;
+}
+
+/** Check if a HID is a valid ACPI ID.
+
+  @param     [in] Hid     The Hid to validate.
+
+  @retval    TRUE         The Hid is a valid ACPI ID.
+  @retval    FALSE        The Hid is not a valid ACPI ID.
+**/
+BOOLEAN
+IsValidAcpiId (
+  IN  CONST CHAR8  * Hid
+  )
+{
+  UINTN Index;
+
+  if (AsciiStrLen (Hid) != 8) {
+    return FALSE;
+  }
+
+  // A valid ACPI ID must be of the form "NNNN####"
+  // where N is an uppercase letter or a digit ('0'-'9')
+  // and # is a hex digit.
+  for (Index = 0; Index < 4; Index++) {
+    if (!(IS_UPPER_CHAR (Hid[Index]) || IS_DIGIT (Hid[Index]))) {
+      return FALSE;
+    }
+  }
+
+  for (Index = 4; Index < 8; Index++) {
+    if (!IS_UPPER_HEX (Hid[Index])) {
+      return FALSE;
+    }
+  }
+
+  return TRUE;
+}
-- 
Guid("CE165669-3EF3-493F-B85D-6190EE5B9759")


^ permalink raw reply related	[flat|nested] 4+ messages in thread

* Re: [edk2-devel] [PATCH] DynamicTablesPkg: add validation for PcdNonBsaCompliant16550SerialHid
  2021-04-09 12:00 [PATCH] DynamicTablesPkg: add validation for PcdNonBsaCompliant16550SerialHid Joey Gouly
@ 2021-04-12 10:01 ` Sami Mujawar
  2021-04-13  9:28   ` Joey Gouly
  0 siblings, 1 reply; 4+ messages in thread
From: Sami Mujawar @ 2021-04-12 10:01 UTC (permalink / raw)
  To: Joey Gouly, devel

[-- Attachment #1: Type: text/plain, Size: 191 bytes --]

Hi Joey,

Can you confirm that your sign-off ID is correct, please?
Otherwise this patch looks good to me.

Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>

Regards,

Sami Mujawar

[-- Attachment #2: Type: text/html, Size: 233 bytes --]

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [edk2-devel] [PATCH] DynamicTablesPkg: add validation for PcdNonBsaCompliant16550SerialHid
  2021-04-12 10:01 ` [edk2-devel] " Sami Mujawar
@ 2021-04-13  9:28   ` Joey Gouly
  2021-04-13 10:39     ` Sami Mujawar
  0 siblings, 1 reply; 4+ messages in thread
From: Joey Gouly @ 2021-04-13  9:28 UTC (permalink / raw)
  To: devel@edk2.groups.io, Sami Mujawar; +Cc: nd

> Hi Joey,
> 
> Can you confirm that your sign-off ID is correct, please?
> Otherwise this patch looks good to me.

That was silly to typo my own name!

Signed-off-by: Joey Gouly <joey.gouly@arm.com>

Thanks for the review!
Joey

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [edk2-devel] [PATCH] DynamicTablesPkg: add validation for PcdNonBsaCompliant16550SerialHid
  2021-04-13  9:28   ` Joey Gouly
@ 2021-04-13 10:39     ` Sami Mujawar
  0 siblings, 0 replies; 4+ messages in thread
From: Sami Mujawar @ 2021-04-13 10:39 UTC (permalink / raw)
  To: Joey Gouly, devel@edk2.groups.io; +Cc: nd

Pushed as 54211ab10fcd..16136f218d54

Thanks.

Regards,

Sami Mujawar


On 13/04/2021, 10:28, "Joey Gouly" <Joey.Gouly@arm.com> wrote:

    > Hi Joey,
    >
    > Can you confirm that your sign-off ID is correct, please?
    > Otherwise this patch looks good to me.

    That was silly to typo my own name!

    Signed-off-by: Joey Gouly <joey.gouly@arm.com>

    Thanks for the review!
    Joey


^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2021-04-13 10:40 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2021-04-09 12:00 [PATCH] DynamicTablesPkg: add validation for PcdNonBsaCompliant16550SerialHid Joey Gouly
2021-04-12 10:01 ` [edk2-devel] " Sami Mujawar
2021-04-13  9:28   ` Joey Gouly
2021-04-13 10:39     ` Sami Mujawar

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox