update

1 files changed, 72 insertions, 0 deletions

diff --git a/paxelf.h b/paxelf.h
new file mode 100644
index 0000000..0c980dc
--- /dev/null
+++ b/paxelf.h
@@ -0,0 +1,72 @@
+#ifndef _PAX_ELF_H
+#define _PAX_ELF_H
+
+
+#include <sys/mman.h>
+#ifdef __linux__
+#include <elf.h>
+#include <asm/elf.h>
+#else
+#include <sys/elf_common.h>
+#endif
+
+#ifndef ELF_CLASS
+#error "UNABLE TO DETECT ELF_CLASS"
+#endif
+
+#if (ELF_CLASS == ELFCLASS32)
+#define Elf_Ehdr        Elf32_Ehdr
+#define Elf_Phdr        Elf32_Phdr
+#define Elf_Shdr        Elf32_Shdr
+#define Elf_Dyn         Elf32_Dyn
+#endif
+
+#if (ELF_CLASS == ELFCLASS64)
+#define Elf_Ehdr        Elf64_Ehdr
+#define Elf_Phdr        Elf64_Phdr
+#define Elf_Shdr        Elf64_Shdr
+#define Elf_Dyn         Elf64_Dyn
+#endif
+
+struct Elf_File {
+   Elf_Ehdr *ehdr;
+   Elf_Phdr *phdr;
+   Elf_Shdr *shdr;
+   Elf_Dyn *dyn;
+   char *data;
+   int len;
+};
+
+typedef struct Elf_File elfobj;
+
+/* prototypes */
+char *pax_short_flags(unsigned long flags);
+int check_elf_header(Elf_Ehdr const *const ehdr);
+elfobj *readelf(char *filename);
+
+
+#define IS_ELF_ET_EXEC(elf) ( \
+        (elf->ehdr->e_type == ET_EXEC) && \
+                (elf->ehdr->e_ident[EI_CLASS] == ELFCLASS32 || \
+                        elf->ehdr->e_ident[EI_CLASS] == ELFCLASS64) \
+        )
+
+#define IS_ELF_ET_DYN(elf) ( \
+        (elf->ehdr->e_type == ET_DYN) && \
+                (elf->ehdr->e_ident[EI_CLASS] == ELFCLASS32 || \
+                        elf->ehdr->e_ident[EI_CLASS] == ELFCLASS64) \
+        )
+
+/* PaX flags (to be read in elfhdr.e_flags) */
+#define HF_PAX_PAGEEXEC         1	/* 0: Paging based non-exec pages */
+#define HF_PAX_EMUTRAMP         2	/* 0: Emulate trampolines */
+#define HF_PAX_MPROTECT         4	/* 0: Restrict mprotect() */
+#define HF_PAX_RANDMMAP         8	/* 0: Randomize mmap() base */
+#define HF_PAX_RANDEXEC         16	/* 1: Randomize ET_EXEC base */
+#define HF_PAX_SEGMEXEC         32	/* 0: Segmentation based non-exec pages */
+
+#define EI_PAX                  14	/* Index in e_ident[] where to read flags */
+
+#define PAX_FLAGS(elf) ((elf->ehdr->e_ident[EI_PAX + 1] << 8) + (elf->ehdr->e_ident[EI_PAX]))
+
+#endif				/* _PAX_ELF_H */