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IntelFsp2Pkg/SplitFspBin.py: Command crashed when FV almost full. 

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2310

When target FV 99% used and only few bytes space left,
SplitFspBin.py may crash with below error:

  File "SplitFspBin.py", line 457, in ParseFv
    ffshdr = EFI_FFS_FILE_HEADER.from_buffer (self.FvData, offset)
ValueError: Buffer size too small
  (40960 instead of at least 40968 bytes)

It was because the offset used by FFS_HEADER parser out of bounds.
It should stop parsing when offset equal or larger than
(buffer size - FFS_HEADER size).

This patch also fixed another crash issue when running script with
Python 3.x and no input parameter given:

  File "SplitFspBin.py", line 868, in main
    if args.which in ['rebase', 'split', 'genhdr', 'info']:
AttributeError: 'Namespace' object has no attribute 'which'

Test:
1. Ran script with both py2 and py3 with no input and no crash observed.
2. Compare the script result before and after the patch are identical.

Cc: Maurice Ma <maurice.ma@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Signed-off-by: Chasel Chiu <chasel.chiu@intel.com>
Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
This commit is contained in:
Chasel Chiu 2019-10-25 15:46:19 +08:00
parent 6996ec88a2
commit 9e639c1cb6
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
IntelFsp2Pkg/Tools/SplitFspBin.py
View File

@ -428,7 +428,7 @@ class FirmwareFile:
ffssize = len(self.FfsData)
offset = sizeof(self.FfsHdr)
if self.FfsHdr.Name != '\xff' * 16:
while offset < ffssize:
while offset < (ffssize - sizeof (EFI_COMMON_SECTION_HEADER)):
sechdr = EFI_COMMON_SECTION_HEADER.from_buffer (self.FfsData, offset)
sec = Section (offset, self.FfsData[offset:offset + int(sechdr.Size)])
self.SecList.append(sec)
@ -453,7 +453,7 @@ class FirmwareVolume:
else:
offset = self.FvHdr.HeaderLength
offset = AlignPtr(offset)
while offset < fvsize:
while offset < (fvsize - sizeof (EFI_FFS_FILE_HEADER)):
ffshdr = EFI_FFS_FILE_HEADER.from_buffer (self.FvData, offset)
if (ffshdr.Name == '\xff' * 16) and (int(ffshdr.Size) == 0xFFFFFF):
offset = fvsize
@ -515,7 +515,7 @@ class FirmwareDevice:
offset = 0
fdsize = len(self.FdData)
self.FvList = []
while offset < fdsize:
while offset < (fdsize - sizeof (EFI_FIRMWARE_VOLUME_HEADER)):
fvh = EFI_FIRMWARE_VOLUME_HEADER.from_buffer (self.FdData, offset)
if b'_FVH' != fvh.Signature:
raise Exception("ERROR: Invalid FV header !")
@ -838,7 +838,7 @@ def RebaseFspBin (FspBinary, FspComponent, FspBase, OutputDir, OutputFile):
def main ():
parser = argparse.ArgumentParser()
subparsers = parser.add_subparsers(title='commands')
subparsers = parser.add_subparsers(title='commands', dest="which")
parser_rebase = subparsers.add_parser('rebase', help='rebase a FSP into a new base address')
parser_rebase.set_defaults(which='rebase')
@ -880,7 +880,7 @@ def main ():
elif args.which == 'info':
ShowFspInfo (args.FspBinary)
else:
pass
parser.print_help()
return 0