Virgin import of Christos Zoulas's FILE 4.10.

*- file is now broken into a library containing and processing the magic
   and a consumer binary.

1 files changed, 578 insertions, 408 deletions

diff --git a/contrib/file/readelf.c b/contrib/file/readelf.c
index 2259558..ccfa491 100644
--- a/contrib/file/readelf.c
+++ b/contrib/file/readelf.c
@@ -1,3 +1,31 @@
+/*
+ * Copyright (c) Christos Zoulas 2003.
+ * All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice immediately at the beginning of the file, without modification,
+ *    this list of conditions, and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *  
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
 #include "file.h"
 
 #ifdef BUILTIN_ELF
@@ -11,20 +39,24 @@
 #include "readelf.h"
 
 #ifndef lint
-FILE_RCSID("@(#)$Id: readelf.c,v 1.26 2003/02/25 15:30:00 christos Exp $")
+FILE_RCSID("@(#)$Id: readelf.c,v 1.42 2004/07/24 20:57:22 christos Exp $")
 #endif
 
 #ifdef	ELFCORE
-static void dophn_core(int, int, int, off_t, int, size_t);
+private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t);
 #endif
-static void dophn_exec(int, int, int, off_t, int, size_t);
-static void doshn(int, int, int, off_t, int, size_t);
+private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t);
+private int doshn(struct magic_set *, int, int, int, off_t, int, size_t);
+private size_t donote(struct magic_set *, unsigned char *, size_t, size_t, int,
+    int, size_t);
 
-static uint16_t getu16(int, uint16_t);
-static uint32_t getu32(int, uint32_t);
-static uint64_t getu64(int, uint64_t);
+#define	ELF_ALIGN(a)	((((a) + align - 1) / align) * align)
 
-static uint16_t
+private uint16_t getu16(int, uint16_t);
+private uint32_t getu32(int, uint32_t);
+private uint64_t getu64(int, uint64_t);
+
+private uint16_t
 getu16(int swap, uint16_t value)
 {
 	union {
@@ -43,7 +75,7 @@ getu16(int swap, uint16_t value)
 		return value;
 }
 
-static uint32_t
+private uint32_t
 getu32(int swap, uint32_t value)
 {
 	union {
@@ -64,7 +96,7 @@ getu32(int swap, uint32_t value)
 		return value;
 }
 
-static uint64_t
+private uint64_t
 getu64(int swap, uint64_t value)
 {
 	union {
@@ -110,205 +142,33 @@ getu64(int swap, uint64_t value)
 #define ph_offset	(class == ELFCLASS32		\
 			 ? getu32(swap, ph32.p_offset)	\
 			 : getu64(swap, ph64.p_offset))
-#define ph_align	(class == ELFCLASS32		\
-			 ? (ph32.p_align ? getu32(swap, ph32.p_align) : 4) \
-			 : (ph64.p_align ? getu64(swap, ph64.p_align) : 4))
+#define ph_align	(size_t)((class == ELFCLASS32	\
+			 ? (off_t) (ph32.p_align ? 	\
+			    getu32(swap, ph32.p_align) : 4) \
+			 : (off_t) (ph64.p_align ?	\
+			    getu64(swap, ph64.p_align) : 4)))
+#define ph_filesz	(size_t)((class == ELFCLASS32	\
+			 ? getu32(swap, ph32.p_filesz)	\
+			 : getu64(swap, ph64.p_filesz)))
+#define ph_memsz	(size_t)((class == ELFCLASS32	\
+			 ? getu32(swap, ph32.p_memsz)	\
+			 : getu64(swap, ph64.p_memsz)))
 #define nh_size		(class == ELFCLASS32		\
-			 ? sizeof *nh32			\
-			 : sizeof *nh64)
+			 ? sizeof nh32			\
+			 : sizeof nh64)
 #define nh_type		(class == ELFCLASS32		\
-			 ? getu32(swap, nh32->n_type)	\
-			 : getu32(swap, nh64->n_type))
+			 ? getu32(swap, nh32.n_type)	\
+			 : getu32(swap, nh64.n_type))
 #define nh_namesz	(class == ELFCLASS32		\
-			 ? getu32(swap, nh32->n_namesz)	\
-			 : getu32(swap, nh64->n_namesz))
+			 ? getu32(swap, nh32.n_namesz)	\
+			 : getu32(swap, nh64.n_namesz))
 #define nh_descsz	(class == ELFCLASS32		\
-			 ? getu32(swap, nh32->n_descsz)	\
-			 : getu32(swap, nh64->n_descsz))
+			 ? getu32(swap, nh32.n_descsz)	\
+			 : getu32(swap, nh64.n_descsz))
 #define prpsoffsets(i)	(class == ELFCLASS32		\
 			 ? prpsoffsets32[i]		\
 			 : prpsoffsets64[i])
 
-static void
-doshn(int class, int swap, int fd, off_t off, int num, size_t size)
-{
-	Elf32_Shdr sh32;
-	Elf64_Shdr sh64;
-
-	if (size != sh_size)
-		error("corrupted section header size.\n");
-
-	if (lseek(fd, off, SEEK_SET) == -1)
-		error("lseek failed (%s).\n", strerror(errno));
-
-	for ( ; num; num--) {
-		if (read(fd, sh_addr, sh_size) == -1)
-			error("read failed (%s).\n", strerror(errno));
-		if (shs_type == SHT_SYMTAB /* || shs_type == SHT_DYNSYM */) {
-			(void) printf (", not stripped");
-			return;
-		}
-	}
-	(void) printf (", stripped");
-}
-
-/*
- * Look through the program headers of an executable image, searching
- * for a PT_INTERP section; if one is found, it's dynamically linked,
- * otherwise it's statically linked.
- */
-static void
-dophn_exec(int class, int swap, int fd, off_t off, int num, size_t size)
-{
-	Elf32_Phdr ph32;
-	Elf32_Nhdr *nh32 = NULL;
-	Elf64_Phdr ph64;
-	Elf64_Nhdr *nh64 = NULL;
-	char *linking_style = "statically";
-	char *shared_libraries = "";
-	char nbuf[BUFSIZ];
-	int bufsize;
-	size_t offset, nameoffset;
-	off_t savedoffset;
-
-	if (size != ph_size)
-		error("corrupted program header size.\n");
-	if (lseek(fd, off, SEEK_SET) == -1)
-		error("lseek failed (%s).\n", strerror(errno));
-
-  	for ( ; num; num--) {
-  		if (read(fd, ph_addr, ph_size) == -1)
-  			error("read failed (%s).\n", strerror(errno));
-		if ((savedoffset = lseek(fd, 0, SEEK_CUR)) == -1)
-  			error("lseek failed (%s).\n", strerror(errno));
-
-		switch (ph_type) {
-		case PT_DYNAMIC:
-			linking_style = "dynamically";
-			break;
-		case PT_INTERP:
-			shared_libraries = " (uses shared libs)";
-			break;
-		case PT_NOTE:
-			/*
-			 * This is a PT_NOTE section; loop through all the notes
-			 * in the section.
-			 */
-			if (lseek(fd, (off_t) ph_offset, SEEK_SET) == -1)
-				error("lseek failed (%s).\n", strerror(errno));
-			bufsize = read(fd, nbuf, sizeof(nbuf));
-			if (bufsize == -1)
-				error(": " "read failed (%s).\n",
-				    strerror(errno));
-			offset = 0;
-			for (;;) {
-				if (offset >= bufsize)
-					break;
-				if (class == ELFCLASS32)
-					nh32 = (Elf32_Nhdr *)&nbuf[offset];
-				else
-					nh64 = (Elf64_Nhdr *)&nbuf[offset];
-				offset += nh_size;
-	
-				if (offset + nh_namesz >= bufsize) {
-					/*
-					 * We're past the end of the buffer.
-					 */
-					break;
-				}
-
-				nameoffset = offset;
-				offset += nh_namesz;
-				offset = ((offset+ph_align-1)/ph_align)*ph_align;
-
-				if ((nh_namesz == 0) && (nh_descsz == 0)) {
-					/*
-					 * We're out of note headers.
-					 */
-					break;
-				}
-
-				if (offset + nh_descsz >= bufsize)
-					break;
-
-				if (nh_namesz == 4 &&
-				    strcmp(&nbuf[nameoffset], "GNU") == 0 &&
-				    nh_type == NT_GNU_VERSION &&
-				    nh_descsz == 16) {
-					uint32_t *desc =
-					    (uint32_t *)&nbuf[offset];
-
-					printf(", for GNU/");
-					switch (getu32(swap, desc[0])) {
-					case GNU_OS_LINUX:
-						printf("Linux");
-						break;
-					case GNU_OS_HURD:
-						printf("Hurd");
-						break;
-					case GNU_OS_SOLARIS:
-						printf("Solaris");
-						break;
-					default:
-						printf("<unknown>");
-					}
-					printf(" %d.%d.%d",
-					    getu32(swap, desc[1]),
-					    getu32(swap, desc[2]),
-					    getu32(swap, desc[3]));
-				}
-
-				if (nh_namesz == 7 &&
-				    strcmp(&nbuf[nameoffset], "NetBSD") == 0 &&
-				    nh_type == NT_NETBSD_VERSION &&
-				    nh_descsz == 4) {
-					printf(", for NetBSD");
-					/*
-					 * Version number is stuck at 199905,
-					 * and hence is basically content-free.
-					 */
-				}
-
-				if (nh_namesz == 8 &&
-				    strcmp(&nbuf[nameoffset], "FreeBSD") == 0 &&
-				    nh_type == NT_FREEBSD_VERSION &&
-				    nh_descsz == 4) {
-					uint32_t desc = getu32(swap,
-					    *(uint32_t *)&nbuf[offset]);
-					printf(", for FreeBSD");
-					/*
-					 * Contents is __FreeBSD_version,
-					 * whose relation to OS versions is
-					 * defined by a huge table in the
-					 * Porters' Handbook.  Happily, the
-					 * first three digits are the version
-					 * number, at least in versions of
-					 * FreeBSD that use this note.
-					 */
-
-					printf(" %d.%d", desc / 100000,
-					    desc / 10000 % 10);
-					if (desc / 1000 % 10 > 0)
-						printf(".%d",
-						    desc / 1000 % 10);
-				}
-
-				if (nh_namesz == 8 &&
-				    strcmp(&nbuf[nameoffset], "OpenBSD") == 0 &&
-				    nh_type == NT_OPENBSD_VERSION &&
-				    nh_descsz == 4) {
-					printf(", for OpenBSD");
-					/* Content of note is always 0 */
-				}
-			}
-			if ((lseek(fd, savedoffset + offset, SEEK_SET)) == -1)
-				error("lseek failed (%s).\n", strerror(errno));
-			break;
-		}
-	}
-	printf(", %s linked%s", linking_style, shared_libraries);
-}
-
 #ifdef ELFCORE
 size_t	prpsoffsets32[] = {
 	8,		/* FreeBSD */
@@ -351,36 +211,39 @@ size_t	prpsoffsets64[] = {
 #define	OS_STYLE_FREEBSD	1
 #define	OS_STYLE_NETBSD		2
 
-static const char *os_style_names[] = {
+private const char *os_style_names[] = {
 	"SVR4",
 	"FreeBSD",
 	"NetBSD",
 };
 
-static void
-dophn_core(int class, int swap, int fd, off_t off, int num, size_t size)
+private int
+dophn_core(struct magic_set *ms, int class, int swap, int fd, off_t off,
+    int num, size_t size)
 {
 	Elf32_Phdr ph32;
-	Elf32_Nhdr *nh32 = NULL;
 	Elf64_Phdr ph64;
-	Elf64_Nhdr *nh64 = NULL;
-	size_t offset, nameoffset, noffset, reloffset;
-	unsigned char c;
-	int i, j;
-	char nbuf[BUFSIZ];
-	int bufsize;
-	int os_style = -1;
-
-	if (size != ph_size)
-		error("corrupted program header size.\n");
+	size_t offset;
+	unsigned char nbuf[BUFSIZ];
+	ssize_t bufsize;
+
+	if (size != ph_size) {
+		if (file_printf(ms, ", corrupted program header size") == -1)
+			return -1;
+		return 0;
+	}
 	/*
 	 * Loop through all the program headers.
 	 */
 	for ( ; num; num--) {
-		if (lseek(fd, off, SEEK_SET) == -1)
-			error("lseek failed (%s).\n", strerror(errno));
-		if (read(fd, ph_addr, ph_size) == -1)
-			error("read failed (%s).\n", strerror(errno));
+		if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
+			file_badseek(ms);
+			return -1;
+		}
+		if (read(fd, ph_addr, ph_size) == -1) {
+			file_badread(ms);
+			return -1;
+		}
 		off += size;
 		if (ph_type != PT_NOTE)
 			continue;
@@ -389,173 +252,478 @@ dophn_core(int class, int swap, int fd, off_t off, int num, size_t size)
 		 * This is a PT_NOTE section; loop through all the notes
 		 * in the section.
 		 */
-		if (lseek(fd, (off_t) ph_offset, SEEK_SET) == -1)
-			error("lseek failed (%s).\n", strerror(errno));
-		bufsize = read(fd, nbuf, BUFSIZ);
-		if (bufsize == -1)
-			error(": " "read failed (%s).\n", strerror(errno));
+		if (lseek(fd, (off_t) ph_offset, SEEK_SET) == (off_t)-1) {
+			file_badseek(ms);
+			return -1;
+		}
+		bufsize = read(fd, nbuf, sizeof(nbuf));
+		if (bufsize == -1) {
+			file_badread(ms);
+			return -1;
+		}
 		offset = 0;
 		for (;;) {
-			if (offset >= bufsize)
+			if (offset >= (size_t)bufsize)
 				break;
-			if (class == ELFCLASS32)
-				nh32 = (Elf32_Nhdr *)&nbuf[offset];
-			else
-				nh64 = (Elf64_Nhdr *)&nbuf[offset];
-			offset += nh_size;
-
-			/*
-			 * Check whether this note has the name "CORE" or
-			 * "FreeBSD", or "NetBSD-CORE".
-			 */
-			if (offset + nh_namesz >= bufsize) {
-				/*
-				 * We're past the end of the buffer.
-				 */
+			offset = donote(ms, nbuf, offset, (size_t)bufsize,
+			    class, swap, 4);
+			if (offset == 0)
 				break;
+
+		}
+	}
+	return 0;
+}
+#endif
+
+private size_t
+donote(struct magic_set *ms, unsigned char *nbuf, size_t offset, size_t size,
+    int class, int swap, size_t align)
+{
+	Elf32_Nhdr nh32;
+	Elf64_Nhdr nh64;
+	size_t noff, doff;
+#ifdef ELFCORE
+	int os_style = -1;
+#endif
+	uint32_t namesz, descsz;
+
+	if (class == ELFCLASS32)
+		memcpy(&nh32, &nbuf[offset], sizeof(nh32));
+	else
+		memcpy(&nh64, &nbuf[offset], sizeof(nh64));
+	offset += nh_size;
+
+	namesz = nh_namesz;
+	descsz = nh_descsz;
+	if ((namesz == 0) && (descsz == 0)) {
+		/*
+		 * We're out of note headers.
+		 */
+		return offset;
+	}
+
+	if (namesz & 0x80000000) {
+	    (void)file_printf(ms, ", bad note name size 0x%lx",
+		(unsigned long)namesz);
+	    return offset;
+	}
+
+	if (descsz & 0x80000000) {
+	    (void)file_printf(ms, ", bad note description size 0x%lx",
+		(unsigned long)descsz);
+	    return offset;
+	}
+
+
+	noff = offset;
+	doff = ELF_ALIGN(offset + namesz);
+
+	if (offset + namesz > size) {
+		/*
+		 * We're past the end of the buffer.
+		 */
+		return doff;
+	}
+
+	offset = ELF_ALIGN(doff + descsz);
+	if (offset + descsz > size) {
+		return offset;
+	}
+
+	if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
+	    nh_type == NT_GNU_VERSION && descsz == 16) {
+		uint32_t desc[4];
+		(void)memcpy(desc, &nbuf[doff], sizeof(desc));
+
+		if (file_printf(ms, ", for GNU/") == -1)
+			return size;
+		switch (getu32(swap, desc[0])) {
+		case GNU_OS_LINUX:
+			if (file_printf(ms, "Linux") == -1)
+				return size;
+			break;
+		case GNU_OS_HURD:
+			if (file_printf(ms, "Hurd") == -1)
+				return size;
+			break;
+		case GNU_OS_SOLARIS:
+			if (file_printf(ms, "Solaris") == -1)
+				return size;
+			break;
+		default:
+			if (file_printf(ms, "<unknown>") == -1)
+				return size; 
+		}
+		if (file_printf(ms, " %d.%d.%d", getu32(swap, desc[1]),
+		    getu32(swap, desc[2]), getu32(swap, desc[3])) == -1)
+			return size;
+		return size;
+	}
+
+	if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0 &&
+	    nh_type == NT_NETBSD_VERSION && descsz == 4) {
+		uint32_t desc;
+		(void)memcpy(&desc, &nbuf[doff], sizeof(desc));
+		desc = getu32(swap, desc);
+
+		if (file_printf(ms, ", for NetBSD") == -1)
+			return size;
+		/*
+		 * The version number used to be stuck as 199905, and was thus
+		 * basically content-free.  Newer versions of NetBSD have fixed
+		 * this and now use the encoding of __NetBSD_Version__:
+		 *
+		 *	MMmmrrpp00
+		 *
+		 * M = major version
+		 * m = minor version
+		 * r = release ["",A-Z,Z[A-Z] but numeric]
+		 * p = patchlevel
+		 */
+		if (desc > 100000000U) {
+			u_int ver_patch = (desc / 100) % 100;
+			u_int ver_rel = (desc / 10000) % 100;
+			u_int ver_min = (desc / 1000000) % 100;
+			u_int ver_maj = desc / 100000000;
+
+			if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
+				return size;
+			if (ver_rel == 0 && ver_patch != 0) {
+				if (file_printf(ms, ".%u", ver_patch) == -1)
+					return size;
+			} else if (ver_rel != 0) {
+				while (ver_rel > 26) {
+					file_printf(ms, "Z");
+					ver_rel -= 26;
+				}
+				file_printf(ms, "%c", 'A' + ver_rel - 1);
 			}
+		}
+		return size;
+	}
 
-			nameoffset = offset;
-			offset += nh_namesz;
-			offset = ((offset + 3)/4)*4;
+	if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0 &&
+	    nh_type == NT_FREEBSD_VERSION && descsz == 4) {
+		uint32_t desc;
+		(void)memcpy(&desc, &nbuf[doff], sizeof(desc));
+		desc = getu32(swap, desc);
+		if (file_printf(ms, ", for FreeBSD") == -1)
+			return size;
 
-			/*
-			 * Sigh.  The 2.0.36 kernel in Debian 2.1, at
-			 * least, doesn't correctly implement name
-			 * sections, in core dumps, as specified by
-			 * the "Program Linking" section of "UNIX(R) System
-			 * V Release 4 Programmer's Guide: ANSI C and
-			 * Programming Support Tools", because my copy
-			 * clearly says "The first 'namesz' bytes in 'name'
-			 * contain a *null-terminated* [emphasis mine]
-			 * character representation of the entry's owner
-			 * or originator", but the 2.0.36 kernel code
-			 * doesn't include the terminating null in the
-			 * name....
-			 */
-			if (os_style == -1) {
-				if ((nh_namesz == 4 &&
-				     strncmp(&nbuf[nameoffset],
-					    "CORE", 4) == 0) ||
-				    (nh_namesz == 5 &&
-				     strcmp(&nbuf[nameoffset],
-				     	    "CORE") == 0)) {
-					os_style = OS_STYLE_SVR4;
-				} else
-				if ((nh_namesz == 8 &&
-				     strcmp(&nbuf[nameoffset],
-				     	    "FreeBSD") == 0)) {
-					os_style = OS_STYLE_FREEBSD;
-				} else
-				if ((nh_namesz >= 11 &&
-				     strncmp(&nbuf[nameoffset],
-				     	     "NetBSD-CORE", 11) == 0)) {
-					os_style = OS_STYLE_NETBSD;
-				} else
-					continue;
-				printf(", %s-style", os_style_names[os_style]);
+		/*
+		 * Contents is __FreeBSD_version, whose relation to OS
+		 * versions is defined by a huge table in the Porters'
+		 * Handbook. For up to 5.x, the first three digits are
+		 * the version number.  For 5.x and higher, the scheme
+		 * is: <major><two digit minor> <0 if release branch,
+		 * otherwise 1>xx
+		 */
+		if (desc / 100000 < 5) {
+			if (desc / 10000 % 10 == 9) {
+				if (file_printf(ms, " %d.%d", desc / 100000,
+				    9 + desc / 1000 % 10) == -1)
+					return size;
+			} else {
+				if (file_printf(ms, " %d.%d", desc / 100000,
+				    desc / 10000 % 10) == -1)
+					return size;
+				if (desc / 1000 % 10 > 0)
+					if (file_printf(ms, ".%d", desc / 1000 % 10)
+					    == -1)
+						return size;
+			}
+			if (desc / 10000 % 10 > 5) {
+				desc %= 1000;
+				if (desc >= 100) {
+					if (file_printf(ms, "-STABLE (rev %d)",
+				    	desc % 100) == -1)
+						return size;
+				} else if (desc != 0) {
+					if (file_printf(ms, ".%d", desc) == -1)
+						return size;
+				}
 			}
+		} else {
+			if (file_printf(ms, " %d.%d", desc / 100000,
+			    desc / 1000 % 100) == -1)
+				return size;
+			desc %= 1000;
+			if (desc >= 100) {
+				if (file_printf(ms, "-CURRENT (rev %d)",
+				    desc % 100) == -1)
+					return size;
+			} else if (desc != 0) {
+				if (file_printf(ms, ".%d", desc / 10) == -1)
+					return size;
+			}
+		}
+		return size;
+	}
 
-			if (os_style == OS_STYLE_NETBSD &&
-			    nh_type == NT_NETBSD_CORE_PROCINFO) {
-				uint32_t signo;
+	if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 &&
+	    nh_type == NT_OPENBSD_VERSION && descsz == 4) {
+		if (file_printf(ms, ", for OpenBSD") == -1)
+			return size;
+		/* Content of note is always 0 */
+		return size;
+	}
 
+	/*
+	 * Sigh.  The 2.0.36 kernel in Debian 2.1, at
+	 * least, doesn't correctly implement name
+	 * sections, in core dumps, as specified by
+	 * the "Program Linking" section of "UNIX(R) System
+	 * V Release 4 Programmer's Guide: ANSI C and
+	 * Programming Support Tools", because my copy
+	 * clearly says "The first 'namesz' bytes in 'name'
+	 * contain a *null-terminated* [emphasis mine]
+	 * character representation of the entry's owner
+	 * or originator", but the 2.0.36 kernel code
+	 * doesn't include the terminating null in the
+	 * name....
+	 */
+	if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) ||
+	    (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) {
+		os_style = OS_STYLE_SVR4;
+	} 
+
+	if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) {
+		os_style = OS_STYLE_FREEBSD;
+	}
+
+	if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11)
+	    == 0)) {
+		os_style = OS_STYLE_NETBSD;
+	}
+
+#ifdef ELFCORE
+	if (os_style != -1)
+		if (file_printf(ms, ", %s-style", os_style_names[os_style]) == -1)
+			return size;
+
+	if (os_style == OS_STYLE_NETBSD && nh_type == NT_NETBSD_CORE_PROCINFO) {
+		uint32_t signo;
+		/*
+		 * Extract the program name.  It is at
+		 * offset 0x7c, and is up to 32-bytes,
+		 * including the terminating NUL.
+		 */
+		if (file_printf(ms, ", from '%.31s'", &nbuf[doff + 0x7c]) == -1)
+			return size;
+		
+		/*
+		 * Extract the signal number.  It is at
+		 * offset 0x08.
+		 */
+		memcpy(&signo, &nbuf[doff + 0x08],
+		    sizeof(signo));
+		if (file_printf(ms, " (signal %u)", getu32(swap, signo)) == -1)
+			return size;
+		return size;
+	} else if (os_style != OS_STYLE_NETBSD && nh_type == NT_PRPSINFO) {
+		size_t i, j;
+		unsigned char c;
+		/*
+		 * Extract the program name.  We assume
+		 * it to be 16 characters (that's what it
+		 * is in SunOS 5.x and Linux).
+		 *
+		 * Unfortunately, it's at a different offset
+		 * in varous OSes, so try multiple offsets.
+		 * If the characters aren't all printable,
+		 * reject it.
+		 */
+		for (i = 0; i < NOFFSETS; i++) {
+			size_t reloffset = prpsoffsets(i);
+			size_t noffset = doff + reloffset;
+			for (j = 0; j < 16; j++, noffset++, reloffset++) {
 				/*
-				 * Extract the program name.  It is at
-				 * offset 0x7c, and is up to 32-bytes,
-				 * including the terminating NUL.
-				 */
-				printf(", from '%.31s'", &nbuf[offset + 0x7c]);
-				
-				/*
-				 * Extract the signal number.  It is at
-				 * offset 0x08.
+				 * Make sure we're not past
+				 * the end of the buffer; if
+				 * we are, just give up.
 				 */
-				memcpy(&signo, &nbuf[offset + 0x08],
-				    sizeof(signo));
-				printf(" (signal %u)", getu32(swap, signo));
-			} else
-			if (os_style != OS_STYLE_NETBSD &&
-			    nh_type == NT_PRPSINFO) {
+				if (noffset >= size)
+					goto tryanother;
+
 				/*
-				 * Extract the program name.  We assume
-				 * it to be 16 characters (that's what it
-				 * is in SunOS 5.x and Linux).
-				 *
-				 * Unfortunately, it's at a different offset
-				 * in varous OSes, so try multiple offsets.
-				 * If the characters aren't all printable,
-				 * reject it.
+				 * Make sure we're not past
+				 * the end of the contents;
+				 * if we are, this obviously
+				 * isn't the right offset.
 				 */
-				for (i = 0; i < NOFFSETS; i++) {
-					reloffset = prpsoffsets(i);
-					noffset = offset + reloffset;
-					for (j = 0; j < 16;
-					    j++, noffset++, reloffset++) {
-						/*
-						 * Make sure we're not past
-						 * the end of the buffer; if
-						 * we are, just give up.
-						 */
-						if (noffset >= bufsize)
-							goto tryanother;
-
-						/*
-						 * Make sure we're not past
-						 * the end of the contents;
-						 * if we are, this obviously
-						 * isn't the right offset.
-						 */
-						if (reloffset >= nh_descsz)
-							goto tryanother;
-
-						c = nbuf[noffset];
-						if (c == '\0') {
-							/*
-							 * A '\0' at the
-							 * beginning is
-							 * obviously wrong.
-							 * Any other '\0'
-							 * means we're done.
-							 */
-							if (j == 0)
-								goto tryanother;
-							else
-								break;
-						} else {
-							/*
-							 * A nonprintable
-							 * character is also
-							 * wrong.
-							 */
-#define isquote(c) (strchr("'\"`", (c)) != NULL)
-							if (!isprint(c) ||
-							     isquote(c))
-								goto tryanother;
-						}
-					}
+				if (reloffset >= descsz)
+					goto tryanother;
 
+				c = nbuf[noffset];
+				if (c == '\0') {
 					/*
-					 * Well, that worked.
+					 * A '\0' at the
+					 * beginning is
+					 * obviously wrong.
+					 * Any other '\0'
+					 * means we're done.
 					 */
-					printf(", from '%.16s'",
-					    &nbuf[offset + prpsoffsets(i)]);
-					break;
-
-				tryanother:
-					;
+					if (j == 0)
+						goto tryanother;
+					else
+						break;
+				} else {
+					/*
+					 * A nonprintable
+					 * character is also
+					 * wrong.
+					 */
+#define isquote(c) (strchr("'\"`", (c)) != NULL)
+					if (!isprint(c) || isquote(c))
+						goto tryanother;
 				}
-				break;
 			}
-			offset += nh_descsz;
-			offset = ((offset + 3)/4)*4;
+
+			/*
+			 * Well, that worked.
+			 */
+			if (file_printf(ms, ", from '%.16s'",
+			    &nbuf[doff + prpsoffsets(i)]) == -1)
+				return size;
+			return size;
+
+		tryanother:
+			;
 		}
+		return offset;
 	}
-}
 #endif
+	return offset;
+}
+
+private int
+doshn(struct magic_set *ms, int class, int swap, int fd, off_t off, int num,
+    size_t size)
+{
+	Elf32_Shdr sh32;
+	Elf64_Shdr sh64;
+
+	if (size != sh_size) {
+		if (file_printf(ms, ", corrupted section header size") == -1)
+			return -1;
+		return 0;
+	}
+
+	if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
+		file_badseek(ms);
+		return -1;
+	}
+
+	for ( ; num; num--) {
+		if (read(fd, sh_addr, sh_size) == -1) {
+			file_badread(ms);
+			return -1;
+		}
+		if (shs_type == SHT_SYMTAB /* || shs_type == SHT_DYNSYM */) {
+			if (file_printf(ms, ", not stripped") == -1)
+				return -1;
+			return 0;
+		}
+	}
+	if (file_printf(ms, ", stripped") == -1)
+		return -1;
+	return 0;
+}
+
+/*
+ * Look through the program headers of an executable image, searching
+ * for a PT_INTERP section; if one is found, it's dynamically linked,
+ * otherwise it's statically linked.
+ */
+private int
+dophn_exec(struct magic_set *ms, int class, int swap, int fd, off_t off,
+    int num, size_t size)
+{
+	Elf32_Phdr ph32;
+	Elf64_Phdr ph64;
+	const char *linking_style = "statically";
+	const char *shared_libraries = "";
+	unsigned char nbuf[BUFSIZ];
+	int bufsize;
+	size_t offset, align;
+	off_t savedoffset;
+
+	if (size != ph_size) {
+		if (file_printf(ms, ", corrupted program header size") == -1)
+		    return -1;
+		return 0;
+	}
+	if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
+		file_badseek(ms);
+		return -1;
+	}
+
+  	for ( ; num; num--) {
+  		if (read(fd, ph_addr, ph_size) == -1) {
+  			file_badread(ms);
+			return -1;
+		}
+		if ((savedoffset = lseek(fd, (off_t)0, SEEK_CUR)) == (off_t)-1) {
+  			file_badseek(ms);
+			return -1;
+		}
+
+		switch (ph_type) {
+		case PT_DYNAMIC:
+			linking_style = "dynamically";
+			break;
+		case PT_INTERP:
+			shared_libraries = " (uses shared libs)";
+			break;
+		case PT_NOTE:
+			if ((align = ph_align) & 0x80000000) {
+				if (file_printf(ms, 
+				    ", invalid note alignment 0x%lx",
+				    (unsigned long)align) == -1)
+					return -1;
+				align = 4;
+			}
+			/*
+			 * This is a PT_NOTE section; loop through all the notes
+			 * in the section.
+			 */
+			if (lseek(fd, (off_t) ph_offset, SEEK_SET)
+			    == (off_t)-1) {
+				file_badseek(ms);
+				return -1;
+			}
+			bufsize = read(fd, nbuf, sizeof(nbuf));
+			if (bufsize == -1) {
+				file_badread(ms);
+				return -1;
+			}
+			offset = 0;
+			for (;;) {
+				if (offset >= (size_t)bufsize)
+					break;
+				offset = donote(ms, nbuf, offset,
+				    (size_t)bufsize, class, swap, align);
+				if (offset == 0)
+					break;
+			}
+			if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
+				file_badseek(ms);
+				return -1;
+			}
+			break;
+		}
+	}
+	if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries)
+	    == -1)
+	    return -1;
+	return 0;
+}
+
 
-void
-tryelf(int fd, unsigned char *buf, int nbytes)
+protected int
+file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf,
+    size_t nbytes)
 {
 	union {
 		int32_t l;
@@ -565,10 +733,10 @@ tryelf(int fd, unsigned char *buf, int nbytes)
 	int swap;
 
 	/*
-	 * If we can't seek, it must be a pipe, socket or fifo.
+	 * If we cannot seek, it must be a pipe, socket or fifo.
 	 */
 	if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE))
-		fd = pipe2file(fd, buf, nbytes);
+		fd = file_pipe2file(ms, fd, buf, nbytes);
 
 	/*
 	 * ELF executables have multiple section headers in arbitrary
@@ -579,7 +747,7 @@ tryelf(int fd, unsigned char *buf, int nbytes)
 	if (buf[EI_MAG0] != ELFMAG0
 	    || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
 	    || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
-	    return;
+	    return 0;
 
 
 	class = buf[4];
@@ -587,88 +755,90 @@ tryelf(int fd, unsigned char *buf, int nbytes)
 	if (class == ELFCLASS32) {
 		Elf32_Ehdr elfhdr;
 		if (nbytes <= sizeof (Elf32_Ehdr))
-			return;
+			return 0;
 
 
 		u.l = 1;
 		(void) memcpy(&elfhdr, buf, sizeof elfhdr);
 		swap = (u.c[sizeof(int32_t) - 1] + 1) != elfhdr.e_ident[5];
 
-		if (getu16(swap, elfhdr.e_type) == ET_CORE) 
+		if (getu16(swap, elfhdr.e_type) == ET_CORE) {
 #ifdef ELFCORE
-			dophn_core(class, swap,
-				   fd,
-				   getu32(swap, elfhdr.e_phoff),
-				   getu16(swap, elfhdr.e_phnum), 
-				   getu16(swap, elfhdr.e_phentsize));
+			if (dophn_core(ms, class, swap, fd,
+			    (off_t)getu32(swap, elfhdr.e_phoff),
+			    getu16(swap, elfhdr.e_phnum), 
+			    (size_t)getu16(swap, elfhdr.e_phentsize)) == -1)
+				return -1;
 #else
 			;
 #endif
-		else {
+		} else {
 			if (getu16(swap, elfhdr.e_type) == ET_EXEC) {
-				dophn_exec(class, swap,
-					   fd,
-					   getu32(swap, elfhdr.e_phoff),
-					   getu16(swap, elfhdr.e_phnum), 
-					   getu16(swap, elfhdr.e_phentsize));
+				if (dophn_exec(ms, class, swap,
+				    fd, (off_t)getu32(swap, elfhdr.e_phoff),
+				    getu16(swap, elfhdr.e_phnum), 
+				    (size_t)getu16(swap, elfhdr.e_phentsize))
+				    == -1)
+					return -1;
 			}
-			doshn(class, swap,
-			      fd,
-			      getu32(swap, elfhdr.e_shoff),
-			      getu16(swap, elfhdr.e_shnum),
-			      getu16(swap, elfhdr.e_shentsize));
+			if (doshn(ms, class, swap, fd,
+			    (off_t)getu32(swap, elfhdr.e_shoff),
+			    getu16(swap, elfhdr.e_shnum),
+			    (size_t)getu16(swap, elfhdr.e_shentsize)) == -1)
+				return -1;
 		}
-		return;
+		return 1;
 	}
 
         if (class == ELFCLASS64) {
 		Elf64_Ehdr elfhdr;
 		if (nbytes <= sizeof (Elf64_Ehdr))
-			return;
+			return 0;
 
 
 		u.l = 1;
 		(void) memcpy(&elfhdr, buf, sizeof elfhdr);
 		swap = (u.c[sizeof(int32_t) - 1] + 1) != elfhdr.e_ident[5];
 
-		if (getu16(swap, elfhdr.e_type) == ET_CORE) 
+		if (getu16(swap, elfhdr.e_type) == ET_CORE) {
 #ifdef ELFCORE
-			dophn_core(class, swap,
-				   fd,
+			if (dophn_core(ms, class, swap, fd,
 #ifdef USE_ARRAY_FOR_64BIT_TYPES
-				   getu32(swap, elfhdr.e_phoff[1]),
+			    (off_t)getu32(swap, elfhdr.e_phoff[1]),
 #else
-				   getu64(swap, elfhdr.e_phoff),
+			    (off_t)getu64(swap, elfhdr.e_phoff),
 #endif
-				   getu16(swap, elfhdr.e_phnum), 
-				   getu16(swap, elfhdr.e_phentsize));
+			    getu16(swap, elfhdr.e_phnum), 
+			    (size_t)getu16(swap, elfhdr.e_phentsize)) == -1)
+				return -1;
 #else
 			;
 #endif
-		else
-		{
+		} else {
 			if (getu16(swap, elfhdr.e_type) == ET_EXEC) {
-				dophn_exec(class, swap,
-					   fd,
+				if (dophn_exec(ms, class, swap, fd,
 #ifdef USE_ARRAY_FOR_64BIT_TYPES
-					   getu32(swap, elfhdr.e_phoff[1]),
+				    (off_t)getu32(swap, elfhdr.e_phoff[1]),
 #else
-					   getu64(swap, elfhdr.e_phoff),
+				    (off_t)getu64(swap, elfhdr.e_phoff),
 #endif
-					   getu16(swap, elfhdr.e_phnum), 
-					   getu16(swap, elfhdr.e_phentsize));
+				    getu16(swap, elfhdr.e_phnum), 
+				    (size_t)getu16(swap, elfhdr.e_phentsize))
+				    == -1)
+					return -1;
 			}
-			doshn(class, swap,
-			      fd,
+			if (doshn(ms, class, swap, fd,
 #ifdef USE_ARRAY_FOR_64BIT_TYPES
-			      getu32(swap, elfhdr.e_shoff[1]),
+			    (off_t)getu32(swap, elfhdr.e_shoff[1]),
 #else
-			      getu64(swap, elfhdr.e_shoff),
+			    (off_t)getu64(swap, elfhdr.e_shoff),
 #endif
-			      getu16(swap, elfhdr.e_shnum),
-			      getu16(swap, elfhdr.e_shentsize));
+			    getu16(swap, elfhdr.e_shnum),
+			    (size_t)getu16(swap, elfhdr.e_shentsize)) == -1)
+				return -1;
 		}
-		return;
+		return 1;
 	}
+	return 0;
 }
 #endif