svn commit: r348776 - in head: contrib/elftoolchain/elfdump contrib/elftoolchain/readelf sys/sys

[Christian S.J. Peron]

Author: csjp
Date: Fri Jun  7 14:51:55 2019
New Revision: 348776
URL: https://svnweb.freebsd.org/changeset/base/348776

Log:
  Teach readelf about some OpenBSD ELF program headers
  
  - Add constants for OpenBSD wxneeded, bootdata and randomize to the
    FreeBSD elf_common.h file. This is the file that gets used by the
    elftoolchain library.
  - Update readelf and elfdump utilities to decode these program headers
    if they are encountered.
  
  Note: FreeBSD has it's own version of elfdump(1), which will be updated
  in a subsequent commit. I am adding it here anyway because this diff is
  going to be submitted upstream.
  
  Discussed with:	emaste
  Reviewed by:	imp
  MFC afer:	2 weeks
  Differential Revision:	https://reviews.freebsd.org/D20548
  
  M    contrib/elftoolchain/elfdump/elfdump.c
  M    contrib/elftoolchain/readelf/readelf.c
  M    sys/sys/elf_common.h

Modified:
  head/contrib/elftoolchain/elfdump/elfdump.c
  head/contrib/elftoolchain/readelf/readelf.c
  head/sys/sys/elf_common.h

Modified: head/contrib/elftoolchain/elfdump/elfdump.c
==============================================================================
--- head/contrib/elftoolchain/elfdump/elfdump.c	Fri Jun  7 10:09:43 2019	(r348775)
+++ head/contrib/elftoolchain/elfdump/elfdump.c	Fri Jun  7 14:51:55 2019	(r348776)
@@ -343,17 +343,20 @@ elf_phdr_type_str(unsigned int type)
 	static char s_type[32];
 
 	switch (type) {
-	case PT_NULL:		return "PT_NULL";
-	case PT_LOAD:		return "PT_LOAD";
-	case PT_DYNAMIC:	return "PT_DYNAMIC";
-	case PT_INTERP:		return "PT_INTERP";
-	case PT_NOTE:		return "PT_NOTE";
-	case PT_SHLIB:		return "PT_SHLIB";
-	case PT_PHDR:		return "PT_PHDR";
-	case PT_TLS:		return "PT_TLS";
-	case PT_GNU_EH_FRAME:	return "PT_GNU_EH_FRAME";
-	case PT_GNU_STACK:	return "PT_GNU_STACK";
-	case PT_GNU_RELRO:	return "PT_GNU_RELRO";
+	case PT_NULL:			return "PT_NULL";
+	case PT_LOAD:			return "PT_LOAD";
+	case PT_DYNAMIC:		return "PT_DYNAMIC";
+	case PT_INTERP:			return "PT_INTERP";
+	case PT_NOTE:			return "PT_NOTE";
+	case PT_SHLIB:			return "PT_SHLIB";
+	case PT_PHDR:			return "PT_PHDR";
+	case PT_TLS:			return "PT_TLS";
+	case PT_GNU_EH_FRAME:		return "PT_GNU_EH_FRAME";
+	case PT_GNU_STACK:		return "PT_GNU_STACK";
+	case PT_GNU_RELRO:		return "PT_GNU_RELRO";
+	case PT_OPENBSD_RANDOMIZE:	return "PT_OPENBSD_RANDOMIZE";
+	case PT_OPENBSD_WXNEEDED:	return "PT_OPENBSD_WXNEEDED";
+	case PT_OPENBSD_BOOTDATA:	return "PT_OPENBSD_BOOTDATA";
 	}
 	snprintf(s_type, sizeof(s_type), "<unknown: %#x>", type);
 	return (s_type);

Modified: head/contrib/elftoolchain/readelf/readelf.c
==============================================================================
--- head/contrib/elftoolchain/readelf/readelf.c	Fri Jun  7 10:09:43 2019	(r348775)
+++ head/contrib/elftoolchain/readelf/readelf.c	Fri Jun  7 14:51:55 2019	(r348776)
@@ -674,6 +674,9 @@ phdr_type(unsigned int mach, unsigned int ptype)
 	case PT_GNU_EH_FRAME: return "GNU_EH_FRAME";
 	case PT_GNU_STACK: return "GNU_STACK";
 	case PT_GNU_RELRO: return "GNU_RELRO";
+	case PT_OPENBSD_RANDOMIZE: return "OPENBSD_RANDOMIZE";
+	case PT_OPENBSD_WXNEEDED: return "OPENBSD_WXNEEDED";
+	case PT_OPENBSD_BOOTDATA: return "OPENBSD_BOOTDATA";
 	default:
 		if (ptype >= PT_LOOS && ptype <= PT_HIOS)
 			snprintf(s_ptype, sizeof(s_ptype), "LOOS+%#x",

Modified: head/sys/sys/elf_common.h
==============================================================================
--- head/sys/sys/elf_common.h	Fri Jun  7 10:09:43 2019	(r348775)
+++ head/sys/sys/elf_common.h	Fri Jun  7 14:51:55 2019	(r348776)
@@ -535,6 +535,10 @@ typedef struct {
 #define	PT_ARM_EXIDX	0x70000001	/* ARM exception unwind tables. */
 #define	PT_HIPROC	0x7fffffff	/* Last processor-specific type. */
 
+#define	PT_OPENBSD_RANDOMIZE	0x65A3DBE6	/* OpenBSD random data segment */
+#define	PT_OPENBSD_WXNEEDED	0x65A3DBE7	/* OpenBSD EXEC/WRITE pages needed */
+#define	PT_OPENBSD_BOOTDATA	0x65A41BE6	/* OpenBSD section for boot args */
+
 /* Values for p_flags. */
 #define	PF_X		0x1		/* Executable. */
 #define	PF_W		0x2		/* Writable. */