[v2] Resolve undefined behaviours in left shift OPs

[edk2] [PATCH v2 0/6] Resolve undefined behaviours in left shift OPs

Hao Wu posted 6 patches 7 years, 3 months ago

Diff against v1 v3
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MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c          |  4 ++--
MdeModulePkg/Core/Dxe/Event/Tpl.c                         | 12 +++++++++---
MdeModulePkg/Core/RuntimeDxe/Crc32.c                      |  6 +++---
MdeModulePkg/Library/DxeNetLib/DxeNetLib.c                |  2 +-
MdeModulePkg/Library/DxePrintLibPrint2Protocol/PrintLib.c |  2 +-
MdePkg/Library/BasePrintLib/PrintLibInternal.c            |  2 +-
6 files changed, 17 insertions(+), 11 deletions(-)

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[edk2] [PATCH v2 0/6] Resolve undefined behaviours in left shift OPs

Posted by Hao Wu 7 years, 3 months ago

According to the feebacks from Paolo, the following changes are made in
this version of patch series:
  a. Refine the code logic in Tpl.c to void left shifting the negative
     value. Also makes the code more readable;
  b. Remove the '~' operator before 'Time.Hour' in DxeNetLib.c, since it
     seems like an implementation choice for generating the seed;
  c. Use '1U' instead of '(UINT32)1' in Crc32.c.


V1 history:
The series resolves two kinds of undefined behaviours in left shift
operations:
  a. Left-shifting negative values;
  b. Left-shifting that incurs the result being out of range.

Cc: Steven Shi <steven.shi@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Wu Jiaxin <jiaxin.wu@intel.com>
Cc: Qin Long <qin.long@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com> 

Hao Wu (6):
  MdePkg/PrintLib: Fix possible negative value left shift
  MdeModulePkg/PrintLib: Fix possible negative value left shift
  MdeModulePkg/Tpl: Fix negative value left shift
  MdeModulePkg/DxeNetLib: Fix negative value left shift
  MdeModulePkg/Crc32: Fix possible out of range left shift
  MdeModulePkg/AtaAtapiPassThru: Fix possible out of range left shift

 MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c          |  4 ++--
 MdeModulePkg/Core/Dxe/Event/Tpl.c                         | 12 +++++++++---
 MdeModulePkg/Core/RuntimeDxe/Crc32.c                      |  6 +++---
 MdeModulePkg/Library/DxeNetLib/DxeNetLib.c                |  2 +-
 MdeModulePkg/Library/DxePrintLibPrint2Protocol/PrintLib.c |  2 +-
 MdePkg/Library/BasePrintLib/PrintLibInternal.c            |  2 +-
 6 files changed, 17 insertions(+), 11 deletions(-)

-- 
2.12.0.windows.1

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