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authorNick Clifton <nickc@redhat.com>2014-08-20 16:10:29 +0100
committerNick Clifton <nickc@redhat.com>2014-08-20 16:10:29 +0100
commit2d5c3743a3a223dc6467ff022124b4f2f1844c91 (patch)
treec8d626b5afab0f3a57911c01e6c5194ed7247310 /include
parentd36430db79dc8eccb9cb188e1234f7ff044f79b4 (diff)
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Enabling the HIGH_ENTROPY_VA flag allows the operating system to use
addresses outside of the 32-bit range before memory exhaustion. This results in a higher entropy implementation of ASLR when used with the DYNAMIC_BASE flag. * include/coff/pe.h: Add HIGH_ENTROPY_VA flag * ld/emultempl/pep.em: Add --high-entropy-va switch * ld/ld.texinfo: Document the --high-entropy-va switch
Diffstat (limited to 'include')
-rw-r--r--include/coff/ChangeLog4
-rw-r--r--include/coff/pe.h52
2 files changed, 31 insertions, 25 deletions
diff --git a/include/coff/ChangeLog b/include/coff/ChangeLog
index d45ef3d..3f960a3 100644
--- a/include/coff/ChangeLog
+++ b/include/coff/ChangeLog
@@ -1,3 +1,7 @@
+2014-08-20 Daniel Micay <danielmicay@gmail.com>
+
+ * pe.h: Add HIGH_ENTROPY_VA flag
+
2014-04-22 Christian Svensson <blue@cmd.nu>
* or32.h: Delete.
diff --git a/include/coff/pe.h b/include/coff/pe.h
index 0ed9dde..b0fc707 100644
--- a/include/coff/pe.h
+++ b/include/coff/pe.h
@@ -40,6 +40,7 @@
/* DllCharacteristics flag bits. The inconsistent naming may seem
odd, but that is how they are defined in the PE specification. */
+#define IMAGE_DLL_CHARACTERISTICS_HIGH_ENTROPY_VA 0x0020
#define IMAGE_DLL_CHARACTERISTICS_DYNAMIC_BASE 0x0040
#define IMAGE_DLL_CHARACTERISTICS_FORCE_INTEGRITY 0x0080
#define IMAGE_DLL_CHARACTERISTICS_NX_COMPAT 0x0100
@@ -59,16 +60,16 @@
/* Section characteristics added for ppc-nt. */
-#define IMAGE_SCN_TYPE_NO_PAD 0x00000008 /* Reserved. */
+#define IMAGE_SCN_TYPE_NO_PAD 0x00000008 /* Reserved. */
-#define IMAGE_SCN_CNT_CODE 0x00000020 /* Section contains code. */
-#define IMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040 /* Section contains initialized data. */
-#define IMAGE_SCN_CNT_UNINITIALIZED_DATA 0x00000080 /* Section contains uninitialized data. */
+#define IMAGE_SCN_CNT_CODE 0x00000020 /* Section contains code. */
+#define IMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040 /* Section contains initialized data. */
+#define IMAGE_SCN_CNT_UNINITIALIZED_DATA 0x00000080 /* Section contains uninitialized data. */
-#define IMAGE_SCN_LNK_OTHER 0x00000100 /* Reserved. */
-#define IMAGE_SCN_LNK_INFO 0x00000200 /* Section contains comments or some other type of information. */
-#define IMAGE_SCN_LNK_REMOVE 0x00000800 /* Section contents will not become part of image. */
-#define IMAGE_SCN_LNK_COMDAT 0x00001000 /* Section contents comdat. */
+#define IMAGE_SCN_LNK_OTHER 0x00000100 /* Reserved. */
+#define IMAGE_SCN_LNK_INFO 0x00000200 /* Section contains comments or some other type of information. */
+#define IMAGE_SCN_LNK_REMOVE 0x00000800 /* Section contents will not become part of image. */
+#define IMAGE_SCN_LNK_COMDAT 0x00001000 /* Section contents comdat. */
#define IMAGE_SCN_MEM_FARDATA 0x00008000
@@ -77,7 +78,7 @@
#define IMAGE_SCN_MEM_LOCKED 0x00040000
#define IMAGE_SCN_MEM_PRELOAD 0x00080000
-/* Bit position in the s_flags field where the alignment values start. */
+/* Bit position in the s_flags field where the alignment values start. */
#define IMAGE_SCN_ALIGN_POWER_BIT_POS 20
#define IMAGE_SCN_ALIGN_POWER_BIT_MASK 0x00f00000
#define IMAGE_SCN_ALIGN_POWER_NUM(val) \
@@ -89,7 +90,7 @@
#define IMAGE_SCN_ALIGN_2BYTES IMAGE_SCN_ALIGN_POWER_CONST (1)
#define IMAGE_SCN_ALIGN_4BYTES IMAGE_SCN_ALIGN_POWER_CONST (2)
#define IMAGE_SCN_ALIGN_8BYTES IMAGE_SCN_ALIGN_POWER_CONST (3)
-/* Default alignment if no others are specified. */
+/* Default alignment if no others are specified. */
#define IMAGE_SCN_ALIGN_16BYTES IMAGE_SCN_ALIGN_POWER_CONST (4)
#define IMAGE_SCN_ALIGN_32BYTES IMAGE_SCN_ALIGN_POWER_CONST (5)
#define IMAGE_SCN_ALIGN_64BYTES IMAGE_SCN_ALIGN_POWER_CONST (6)
@@ -101,7 +102,7 @@
#define IMAGE_SCN_ALIGN_4096BYTES IMAGE_SCN_ALIGN_POWER_CONST (12)
#define IMAGE_SCN_ALIGN_8192BYTES IMAGE_SCN_ALIGN_POWER_CONST (13)
-/* Encode alignment power into IMAGE_SCN_ALIGN bits of s_flags */
+/* Encode alignment power into IMAGE_SCN_ALIGN bits of s_flags. */
#define COFF_ENCODE_ALIGNMENT(SECTION, ALIGNMENT_POWER) \
((SECTION).s_flags |= IMAGE_SCN_ALIGN_POWER_CONST ((ALIGNMENT_POWER)))
@@ -200,7 +201,7 @@ struct external_PEI_DOS_hdr
struct external_PEI_IMAGE_hdr
{
- char nt_signature[4]; /* required NT signature, 0x4550. */
+ char nt_signature[4]; /* Required NT signature, 0x4550. */
/* From standard header. */
char f_magic[2]; /* Magic number. */
@@ -239,7 +240,7 @@ struct external_PEI_filehdr
/* Note: additional bytes may be inserted before the signature. Use
the e_lfanew field to find the actual location of the NT signature. */
- char nt_signature[4]; /* required NT signature, 0x4550. */
+ char nt_signature[4]; /* Required NT signature, 0x4550. */
/* From standard header. */
char f_magic[2]; /* Magic number. */
@@ -262,7 +263,7 @@ struct external_PEI_filehdr
#endif /* COFF_IMAGE_WITH_PE */
-/* 32-bit PE a.out header: */
+/* 32-bit PE a.out header: */
typedef struct
{
@@ -422,14 +423,14 @@ union external_AUX_SYMBOL_EX
struct
{
- char Length[4]; /* section length */
- char NumberOfRelocations[2]; /* # relocation entries */
- char NumberOfLinenumbers[2]; /* # line numbers */
- char Checksum[4]; /* section COMDAT checksum */
- char Number[2]; /* COMDAT associated section index */
- char Selection[1]; /* COMDAT selection number */
+ char Length[4]; /* Section length. */
+ char NumberOfRelocations[2];/* # relocation entries. */
+ char NumberOfLinenumbers[2];/* # line numbers. */
+ char Checksum[4]; /* Section COMDAT checksum. */
+ char Number[2]; /* COMDAT associated section index. */
+ char Selection[1]; /* COMDAT selection number. */
char bReserved[1];
- char HighNumber[2]; /* High bits of COMDAT associated sec. */
+ char HighNumber[2]; /* High bits of COMDAT associated sec. */
char rgbReserved[2];
} Section;
} ATTRIBUTE_PACKED;
@@ -584,8 +585,9 @@ struct external_pex64_scope_entry
(PEX64_OFFSET_TO_SCOPE_COUNT(COUNTOFUNWINDCODES) + \
PEX64_SCOPE_ENTRY_SIZE * (IDX))
-/* Extra structure used in debug directory */
-struct external_IMAGE_DEBUG_DIRECTORY {
+/* Extra structure used in debug directory. */
+struct external_IMAGE_DEBUG_DIRECTORY
+{
char Characteristics[4];
char TimeDateStamp[4];
char MajorVersion[2];
@@ -596,8 +598,8 @@ struct external_IMAGE_DEBUG_DIRECTORY {
char PointerToRawData[4];
};
-/* Extra structures used in codeview debug record */
-/* This is not part of the PE specification */
+/* Extra structures used in codeview debug record. */
+/* This is not part of the PE specification. */
#define CVINFO_PDB70_CVSIGNATURE 0x53445352 // "RSDS"
#define CVINFO_PDB20_CVSIGNATURE 0x3031424e // "NB10"