[PATCH] D127369: [Object][COFF] Fix section name parsing error when the name field is not null-padded

[Pengxuan Zheng via Phabricator via llvm-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
pzheng marked an inline comment as done.
Closed by commit rG064db243113c: [Object][COFF] Fix section name parsing error when the name field is not null… (authored by pzheng).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D127369/new/

https://reviews.llvm.org/D127369

Files:
  llvm/lib/Object/COFFObjectFile.cpp
  llvm/test/tools/llvm-objdump/COFF/Inputs/long-section-name.yaml
  llvm/test/tools/llvm-objdump/COFF/long-section-name.test


Index: llvm/test/tools/llvm-objdump/COFF/long-section-name.test
===================================================================
--- /dev/null
+++ llvm/test/tools/llvm-objdump/COFF/long-section-name.test
@@ -0,0 +1,30 @@
+# RUN: yaml2obj %S/Inputs/long-section-name.yaml -o %t.obj
+
+## Replace the section name field of the object file with /4\0abcde emulating
+## a section name field not fully null-padded at the end.
+# RUN: %python %s %t.obj
+
+## This should print the LongSectionName section.
+# RUN: llvm-objdump --headers %t.obj | FileCheck %s
+
+# CHECK: LongSectionName
+
+import sys
+
+if len(sys.argv) < 2:
+  print("Use: python3 long-section-name.test <OBJECT_FILE>")
+  exit(1)
+
+pattern = b'/4'
+replacement = b'/4\0abcde'
+
+data = None
+with open(sys.argv[1], "rb") as inp:
+  data = inp.read()
+with open(sys.argv[1], "wb") as outp:
+  pos = data.find(pattern)
+  if pos == -1:
+    sys.exit("Error: Pattern /4 not found in " + sys.argv[1])
+  outp.write(data[:pos])
+  outp.write(replacement)
+  outp.write(data[pos + len(replacement):])
Index: llvm/test/tools/llvm-objdump/COFF/Inputs/long-section-name.yaml
===================================================================
--- /dev/null
+++ llvm/test/tools/llvm-objdump/COFF/Inputs/long-section-name.yaml
@@ -0,0 +1,15 @@
+--- !COFF
+header:
+  Machine:         IMAGE_FILE_MACHINE_ARM64
+  Characteristics: [  ]
+sections:
+  - Name:            LongSectionName
+    Characteristics: [ IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ ]
+symbols:
+  - Name:            LongSectionName
+    Value:           0
+    SectionNumber:   1
+    SimpleType:      IMAGE_SYM_TYPE_NULL
+    ComplexType:     IMAGE_SYM_DTYPE_NULL
+    StorageClass:    IMAGE_SYM_CLASS_STATIC
+...
Index: llvm/lib/Object/COFFObjectFile.cpp
===================================================================
--- llvm/lib/Object/COFFObjectFile.cpp
+++ llvm/lib/Object/COFFObjectFile.cpp
@@ -1168,7 +1168,7 @@
         return createStringError(object_error::parse_failed,
                                  "invalid section name");
     } else {
-      if (Name.substr(1).getAsInteger(10, Offset))
+      if (Name.substr(1).consumeInteger(10, Offset))
         return createStringError(object_error::parse_failed,
                                  "invalid section name");
     }


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D127369.435657.patch
Type: text/x-patch
Size: 2337 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20220609/72363a6a/attachment.bin>