File linux-2.6-modsign-script.patch of Package kernel

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File linux-2.6-modsign-script.patch of Package kernel

diff -urNp --exclude-from=/home/davej/.exclude linux-903/scripts/modsign/Makefile linux-904/scripts/modsign/Makefile
--- linux-903/scripts/modsign/Makefile
+++ linux-904/scripts/modsign/Makefile
@@ -0,0 +1,27 @@
+# Set the following to `true' to make a debuggable build.
+# Leave this set to `false' for production use.
+DEBUG = true
+
+
+ROOT =		mod-extract
+VERSION =	0.1
+INSTALL_DIR =	/usr/local/bin
+RELEASE_NAME =	$(ROOT)-$(VERSION)
+
+CC = gcc
+
+INCLUDES = 
+CFLAGS = -g -O -Wall
+
+OBJS =	mod-extract.o
+
+all: $(ROOT)
+
+$(ROOT): $(OBJS)
+	$(CC) $(LDFLAGS) -o $(ROOT) $(OBJS) -lbfd -liberty $(LIB_OBJS) $(ARCH_LIB_OBJS)
+
+.c.o:
+	$(CC) $(INCLUDES) $(CFLAGS) -c $< -o $@
+
+clean:
+	-rm $(OBJS) $(ROOT)
diff -urNp --exclude-from=/home/davej/.exclude linux-903/scripts/modsign/mod-extract.c linux-904/scripts/modsign/mod-extract.c
--- linux-903/scripts/modsign/mod-extract.c
+++ linux-904/scripts/modsign/mod-extract.c
@@ -0,0 +1,900 @@
+/* mod-extract.c: module extractor for signing
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <elf.h>
+#include <asm/byteorder.h>
+
+void extract_elf64(void *buffer, size_t size, Elf64_Ehdr *hdr);
+void extract_elf32(void *buffer, size_t size, Elf32_Ehdr *hdr);
+
+struct byteorder {
+	uint16_t (*get16)(const uint16_t *);
+	uint32_t (*get32)(const uint32_t *);
+	uint64_t (*get64)(const uint64_t *);
+	void (*set16)(uint16_t *, uint16_t);
+	void (*set32)(uint32_t *, uint32_t);
+	void (*set64)(uint64_t *, uint64_t);
+};
+
+uint16_t get16_le(const uint16_t *p) { return __le16_to_cpu(*p); }
+uint32_t get32_le(const uint32_t *p) { return __le32_to_cpu(*p); }
+uint64_t get64_le(const uint64_t *p) { return __le64_to_cpu(*p); }
+uint16_t get16_be(const uint16_t *p) { return __be16_to_cpu(*p); }
+uint32_t get32_be(const uint32_t *p) { return __be32_to_cpu(*p); }
+uint64_t get64_be(const uint64_t *p) { return __be64_to_cpu(*p); }
+
+void set16_le(uint16_t *p, uint16_t n) { *p = __cpu_to_le16(n); }
+void set32_le(uint32_t *p, uint32_t n) { *p = __cpu_to_le32(n); }
+void set64_le(uint64_t *p, uint64_t n) { *p = __cpu_to_le64(n); }
+void set16_be(uint16_t *p, uint16_t n) { *p = __cpu_to_be16(n); }
+void set32_be(uint32_t *p, uint32_t n) { *p = __cpu_to_be32(n); }
+void set64_be(uint64_t *p, uint64_t n) { *p = __cpu_to_be64(n); }
+
+const struct byteorder byteorder_le = {
+	get16_le, get32_le, get64_le,
+	set16_le, set32_le, set64_le
+};
+const struct byteorder byteorder_be = {
+	get16_be, get32_be, get64_be,
+	set16_be, set32_be, set64_be
+};
+const struct byteorder *order;
+
+uint16_t get16(const uint16_t *p) { return order->get16(p); }
+uint32_t get32(const uint32_t *p) { return order->get32(p); }
+uint64_t get64(const uint64_t *p) { return order->get64(p); }
+void set16(uint16_t *p, uint16_t n) { order->set16(p, n); }
+void set32(uint32_t *p, uint32_t n) { order->set32(p, n); }
+void set64(uint64_t *p, uint64_t n) { order->set64(p, n); }
+
+FILE *outfd;
+uint8_t csum, xcsum;
+
+void write_out(const void *data, size_t size)
+{
+	const uint8_t *p = data;
+	size_t loop;
+
+	for (loop = 0; loop < size; loop++) {
+		csum += p[loop];
+		xcsum += p[loop];
+	}
+
+	if (fwrite(data, 1, size, outfd) != size) {
+		perror("write");
+		exit(1);
+	}
+}
+
+#define write_out_val(VAL) write_out(&(VAL), sizeof(VAL))
+
+int is_verbose;
+
+void verbose(const char *fmt, ...) __attribute__((format(printf,1,2)));
+void verbose(const char *fmt, ...)
+{
+	va_list va;
+
+	if (is_verbose) {
+		va_start(va, fmt);
+		vprintf(fmt, va);
+		va_end(va);
+	}
+}
+
+void usage(void) __attribute__((noreturn));
+void usage(void)
+{
+	fprintf(stderr, "Usage: mod-extract [-v] <modulefile> <extractfile>\n");
+	exit(2);
+}
+
+/*****************************************************************************/
+/*
+ *
+ */
+int main(int argc, char **argv)
+{
+	struct stat st;
+	Elf32_Ehdr *hdr32;
+	Elf64_Ehdr *hdr64;
+	size_t len;
+	void *buffer;
+	int fd, be, b64;
+
+	while (argc > 1 && strcmp("-v", argv[1]) == 0) {
+		argv++;
+		argc--;
+		is_verbose++;
+	}
+
+	if (argc != 3)
+		usage();
+
+	/* map the module into memory */
+	fd = open(argv[1], O_RDONLY);
+	if (fd < 0) {
+		perror("open input");
+		exit(1);
+	}
+
+	if (fstat(fd, &st) < 0) {
+		perror("fstat");
+		exit(1);
+	}
+
+	len = st.st_size;
+
+	buffer = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
+	if (buffer == MAP_FAILED) {
+		perror("mmap");
+		exit(1);
+	}
+
+	if (close(fd) < 0) {
+		perror("close input");
+		exit(1);
+	}
+
+	/* check it's an ELF object */
+	hdr32 = buffer;
+	hdr64 = buffer;
+
+	if (hdr32->e_ident[EI_MAG0] != ELFMAG0 ||
+	    hdr32->e_ident[EI_MAG1] != ELFMAG1 ||
+	    hdr32->e_ident[EI_MAG2] != ELFMAG2 ||
+	    hdr32->e_ident[EI_MAG3] != ELFMAG3
+	    ) {
+		fprintf(stderr, "Module does not appear to be ELF\n");
+		exit(3);
+	}
+
+	/* determine endianness and word size */
+	b64 = (hdr32->e_ident[EI_CLASS] == ELFCLASS64);
+	be = (hdr32->e_ident[EI_DATA] == ELFDATA2MSB);
+	order = be ? &byteorder_be : &byteorder_le;
+
+	verbose("Module is %s-bit %s-endian\n",
+		b64 ? "64" : "32",
+		be ? "big" : "little");
+
+	/* open the output file */
+	outfd = fopen(argv[2], "w");
+	if (!outfd) {
+		perror("open output");
+		exit(1);
+	}
+
+	/* perform the extraction */
+	if (b64)
+ 		extract_elf64(buffer, len, hdr64);
+	else
+ 		extract_elf32(buffer, len, hdr32);
+
+	/* done */
+	if (fclose(outfd) == EOF) {
+		perror("close output");
+		exit(1);
+	}
+
+	return 0;
+
+} /* end main() */
+
+/*****************************************************************************/
+/*
+ * extract a RELA table
+ * - need to canonicalise the entries in case section addition/removal has
+ *   rearranged the symbol table and the section table
+ */
+void extract_elf64_rela(const void *buffer, int secix, int targetix,
+			const Elf64_Rela *relatab, size_t nrels,
+			const Elf64_Sym *symbols, size_t nsyms,
+			const Elf64_Shdr *sections, size_t nsects, int *canonmap,
+			const char *strings, size_t nstrings,
+			const char *sh_name)
+{
+	struct {
+		uint64_t	r_offset;
+		uint64_t	r_addend;
+		uint64_t	st_value;
+		uint64_t	st_size;
+		uint32_t	r_type;
+		uint16_t	st_shndx;
+		uint8_t		st_info;
+		uint8_t		st_other;
+
+	} __attribute__((packed)) relocation;
+
+	const Elf64_Sym *symbol;
+	size_t loop;
+
+	/* contribute the relevant bits from a join of { RELA, SYMBOL, SECTION } */
+	for (loop = 0; loop < nrels; loop++) {
+		Elf64_Section st_shndx;
+		Elf64_Xword r_info;
+
+		/* decode the relocation */
+		r_info = get64(&relatab[loop].r_info);
+		relocation.r_offset = relatab[loop].r_offset;
+		relocation.r_addend = relatab[loop].r_addend;
+		set32(&relocation.r_type, ELF64_R_TYPE(r_info));
+
+		if (ELF64_R_SYM(r_info) >= nsyms) {
+			fprintf(stderr, "Invalid symbol ID %lx in relocation %zu\n",
+				ELF64_R_SYM(r_info), loop);
+			exit(1);
+		}
+
+		/* decode the symbol referenced by the relocation */
+		symbol = &symbols[ELF64_R_SYM(r_info)];
+		relocation.st_info = symbol->st_info;
+		relocation.st_other = symbol->st_other;
+		relocation.st_value = symbol->st_value;
+		relocation.st_size = symbol->st_size;
+		relocation.st_shndx = symbol->st_shndx;
+		st_shndx = get16(&symbol->st_shndx);
+
+		/* canonicalise the section used by the symbol */
+		if (st_shndx > SHN_UNDEF && st_shndx < nsects)
+			set16(&relocation.st_shndx, canonmap[st_shndx]);
+
+		write_out_val(relocation);
+
+		/* undefined symbols must be named if referenced */
+		if (st_shndx == SHN_UNDEF) {
+			const char *name = strings + get32(&symbol->st_name);
+			write_out(name, strlen(name) + 1);
+		}
+	}
+
+	verbose("%02x %4d %s [canon]\n", csum, secix, sh_name);
+
+} /* end extract_elf64_rela() */
+
+/*****************************************************************************/
+/*
+ * extract a REL table
+ * - need to canonicalise the entries in case section addition/removal has
+ *   rearranged the symbol table and the section table
+ */
+void extract_elf64_rel(const void *buffer, int secix, int targetix,
+		       const Elf64_Rel *relatab, size_t nrels,
+		       const Elf64_Sym *symbols, size_t nsyms,
+		       const Elf64_Shdr *sections, size_t nsects, int *canonmap,
+		       const char *strings, size_t nstrings,
+		       const char *sh_name)
+{
+	struct {
+		uint64_t	r_offset;
+		uint64_t	st_value;
+		uint64_t	st_size;
+		uint32_t	r_type;
+		uint16_t	st_shndx;
+		uint8_t		st_info;
+		uint8_t		st_other;
+
+	} __attribute__((packed)) relocation;
+
+	const Elf64_Sym *symbol;
+	size_t loop;
+
+	/* contribute the relevant bits from a join of { RELA, SYMBOL, SECTION } */
+	for (loop = 0; loop < nrels; loop++) {
+		Elf64_Section st_shndx;
+		Elf64_Xword r_info;
+
+		/* decode the relocation */
+		r_info = get64(&relatab[loop].r_info);
+		relocation.r_offset = relatab[loop].r_offset;
+		set32(&relocation.r_type, ELF64_R_TYPE(r_info));
+
+		if (ELF64_R_SYM(r_info) >= nsyms) {
+			fprintf(stderr, "Invalid symbol ID %lx in relocation %zi\n",
+				ELF64_R_SYM(r_info), loop);
+			exit(1);
+		}
+
+		/* decode the symbol referenced by the relocation */
+		symbol = &symbols[ELF64_R_SYM(r_info)];
+		relocation.st_info = symbol->st_info;
+		relocation.st_other = symbol->st_other;
+		relocation.st_value = symbol->st_value;
+		relocation.st_size = symbol->st_size;
+		relocation.st_shndx = symbol->st_shndx;
+		st_shndx = get16(&symbol->st_shndx);
+
+		/* canonicalise the section used by the symbol */
+		if (st_shndx > SHN_UNDEF && st_shndx < nsects)
+			set16(&relocation.st_shndx, canonmap[st_shndx]);
+
+		write_out_val(relocation);
+
+		/* undefined symbols must be named if referenced */
+		if (st_shndx == SHN_UNDEF) {
+			const char *name = strings + get32(&symbol->st_name);
+			write_out(name, strlen(name) + 1);
+		}
+	}
+
+	verbose("%02x %4d %s [canon]\n", csum, secix, sh_name);
+
+} /* end extract_elf64_rel() */
+
+/*****************************************************************************/
+/*
+ * extract the data from a 64-bit module
+ */
+void extract_elf64(void *buffer, size_t len, Elf64_Ehdr *hdr)
+{
+	const Elf64_Sym *symbols;
+	Elf64_Shdr *sections;
+	const char *secstrings, *strings;
+	size_t nsyms, nstrings;
+	int loop, shnum, *canonlist, *canonmap, canon, changed, tmp;
+
+	sections = buffer + get64(&hdr->e_shoff);
+	secstrings = buffer + get64(&sections[get16(&hdr->e_shstrndx)].sh_offset);
+	shnum = get16(&hdr->e_shnum);
+
+	/* find the symbol table and the string table and produce a list of
+	 * index numbers of sections that contribute to the kernel's module
+	 * image
+	 */
+	canonlist = calloc(sizeof(int), shnum * 2);
+	if (!canonlist) {
+		perror("calloc");
+		exit(1);
+	}
+	canonmap = canonlist + shnum;
+	canon = 0;
+
+	symbols = NULL;
+	strings = NULL;
+
+	for (loop = 1; loop < shnum; loop++) {
+		const char *sh_name = secstrings + get32(&sections[loop].sh_name);
+		Elf64_Word  sh_type	= get32(&sections[loop].sh_type);
+		Elf64_Xword sh_size	= get64(&sections[loop].sh_size);
+		Elf64_Xword sh_flags	= get64(&sections[loop].sh_flags);
+		Elf64_Off   sh_offset	= get64(&sections[loop].sh_offset);
+		void *data = buffer + sh_offset;
+
+		/* quick sanity check */
+		if (sh_type != SHT_NOBITS && len < sh_offset + sh_size) {
+			fprintf(stderr, "Section goes beyond EOF\n");
+			exit(3);
+		}
+
+		/* we only need to canonicalise allocatable sections */
+		if (sh_flags & SHF_ALLOC)
+			canonlist[canon++] = loop;
+
+		/* keep track of certain special sections */
+		switch (sh_type) {
+		case SHT_SYMTAB:
+			if (strcmp(sh_name, ".symtab") == 0) {
+				symbols = data;
+				nsyms = sh_size / sizeof(Elf64_Sym);
+			}
+			break;
+
+		case SHT_STRTAB:
+			if (strcmp(sh_name, ".strtab") == 0) {
+				strings = data;
+				nstrings = sh_size;
+			}
+			break;
+
+		default:
+			break;
+		}
+	}
+
+	if (!symbols) {
+		fprintf(stderr, "Couldn't locate symbol table\n");
+		exit(3);
+	}
+
+	if (!strings) {
+		fprintf(stderr, "Couldn't locate strings table\n");
+		exit(3);
+	}
+
+	/* canonicalise the index numbers of the contributing section */
+	do {
+		changed = 0;
+
+		for (loop = 0; loop < canon - 1; loop++) {
+			const char *x = secstrings + get32(&sections[canonlist[loop + 0]].sh_name);
+			const char *y = secstrings + get32(&sections[canonlist[loop + 1]].sh_name);
+			if (strcmp(x, y) > 0) {
+				tmp = canonlist[loop + 0];
+				canonlist[loop + 0] = canonlist[loop + 1];
+				canonlist[loop + 1] = tmp;
+				changed = 1;
+			}
+		}
+
+	} while(changed);
+
+	for (loop = 0; loop < canon; loop++)
+		canonmap[canonlist[loop]] = loop + 1;
+
+	if (is_verbose > 1) {
+		printf("\nSection canonicalisation map:\n");
+		for (loop = 1; loop < shnum; loop++) {
+			const char *x = secstrings + get32(&sections[loop].sh_name);
+			printf("%4d %s\n", canonmap[loop], x);
+		}
+
+		printf("\nAllocated section list in canonical order:\n");
+		for (loop = 0; loop < canon; loop++) {
+			const char *x = secstrings + get32(&sections[canonlist[loop]].sh_name);
+			printf("%4d %s\n", canonlist[loop], x);
+		}
+	}
+
+	memset(canonlist, 0, sizeof(int) * shnum);
+
+	/* iterate through the section table looking for sections we want to
+	 * contribute to the signature */
+	verbose("\n");
+	verbose("FILE POS CS SECT NAME\n");
+	verbose("======== == ==== ==============================\n");
+
+	for (loop = 1; loop < shnum; loop++) {
+		const char *sh_name = secstrings + get32(&sections[loop].sh_name);
+		Elf64_Word  sh_type	= get32(&sections[loop].sh_type);
+		Elf64_Xword sh_size	= get64(&sections[loop].sh_size);
+		Elf64_Xword sh_flags	= get64(&sections[loop].sh_flags);
+		Elf64_Word  sh_info	= get32(&sections[loop].sh_info);
+		Elf64_Off   sh_offset	= get64(&sections[loop].sh_offset);
+		void *data = buffer + sh_offset;
+
+		csum = 0;
+
+		/* include canonicalised relocation sections */
+		if (sh_type == SHT_REL || sh_type == SHT_RELA) {
+			if (sh_info <= 0 && sh_info >= hdr->e_shnum) {
+				fprintf(stderr,
+					"Invalid ELF - REL/RELA sh_info does"
+					" not refer to a valid section\n");
+				exit(3);
+			}
+
+			if (canonlist[sh_info]) {
+				Elf32_Word xsh_info;
+
+				verbose("%08lx ", ftell(outfd));
+
+				set32(&xsh_info, canonmap[sh_info]);
+
+				/* write out selected portions of the section
+				 * header */
+				write_out(sh_name, strlen(sh_name));
+				write_out_val(sections[loop].sh_type);
+				write_out_val(sections[loop].sh_flags);
+				write_out_val(sections[loop].sh_size);
+				write_out_val(sections[loop].sh_addralign);
+				write_out_val(xsh_info);
+
+				if (sh_type == SHT_RELA)
+					extract_elf64_rela(buffer, loop, sh_info,
+							   data, sh_size / sizeof(Elf64_Rela),
+							   symbols, nsyms,
+							   sections, shnum, canonmap,
+							   strings, nstrings,
+							   sh_name);
+				else
+					extract_elf64_rel(buffer, loop, sh_info,
+							  data, sh_size / sizeof(Elf64_Rel),
+							  symbols, nsyms,
+							  sections, shnum, canonmap,
+							  strings, nstrings,
+							  sh_name);
+			}
+
+			continue;
+		}
+
+		/* include allocatable loadable sections */
+		if (sh_type != SHT_NOBITS && sh_flags & SHF_ALLOC)
+			goto include_section;
+
+		/* not this section */
+		continue;
+
+	include_section:
+		verbose("%08lx ", ftell(outfd));
+
+		/* write out selected portions of the section header */
+		write_out(sh_name, strlen(sh_name));
+		write_out_val(sections[loop].sh_type);
+		write_out_val(sections[loop].sh_flags);
+		write_out_val(sections[loop].sh_size);
+		write_out_val(sections[loop].sh_addralign);
+
+		/* write out the section data */
+		write_out(data, sh_size);
+
+		verbose("%02x %4d %s\n", csum, loop, sh_name);
+
+		/* note the section has been written */
+		canonlist[loop] = 1;
+	}
+
+	verbose("%08lx         (%lu bytes csum 0x%02x)\n",
+		ftell(outfd), ftell(outfd), xcsum);
+
+} /* end extract_elf64() */
+
+/*****************************************************************************/
+/*
+ * extract a RELA table
+ * - need to canonicalise the entries in case section addition/removal has
+ *   rearranged the symbol table and the section table
+ */
+void extract_elf32_rela(const void *buffer, int secix, int targetix,
+			const Elf32_Rela *relatab, size_t nrels,
+			const Elf32_Sym *symbols, size_t nsyms,
+			const Elf32_Shdr *sections, size_t nsects, int *canonmap,
+			const char *strings, size_t nstrings,
+			const char *sh_name)
+{
+	struct {
+		uint32_t	r_offset;
+		uint32_t	r_addend;
+		uint32_t	st_value;
+		uint32_t	st_size;
+		uint16_t	st_shndx;
+		uint8_t		r_type;
+		uint8_t		st_info;
+		uint8_t		st_other;
+
+	} __attribute__((packed)) relocation;
+
+	const Elf32_Sym *symbol;
+	size_t loop;
+
+	/* contribute the relevant bits from a join of { RELA, SYMBOL, SECTION } */
+	for (loop = 0; loop < nrels; loop++) {
+		Elf32_Section st_shndx;
+		Elf32_Word r_info;
+
+		/* decode the relocation */
+		r_info = get32(&relatab[loop].r_info);
+		relocation.r_offset = relatab[loop].r_offset;
+		relocation.r_addend = relatab[loop].r_addend;
+		relocation.r_type = ELF32_R_TYPE(r_info);
+
+		if (ELF32_R_SYM(r_info) >= nsyms) {
+			fprintf(stderr, "Invalid symbol ID %x in relocation %zu\n",
+				ELF32_R_SYM(r_info), loop);
+			exit(1);
+		}
+
+		/* decode the symbol referenced by the relocation */
+		symbol = &symbols[ELF32_R_SYM(r_info)];
+		relocation.st_info = symbol->st_info;
+		relocation.st_other = symbol->st_other;
+		relocation.st_value = symbol->st_value;
+		relocation.st_size = symbol->st_size;
+		relocation.st_shndx = symbol->st_shndx;
+		st_shndx = get16(&symbol->st_shndx);
+
+		/* canonicalise the section used by the symbol */
+		if (st_shndx > SHN_UNDEF && st_shndx < nsects)
+			set16(&relocation.st_shndx, canonmap[st_shndx]);
+
+		write_out_val(relocation);
+
+		/* undefined symbols must be named if referenced */
+		if (st_shndx == SHN_UNDEF) {
+			const char *name = strings + get32(&symbol->st_name);
+			write_out(name, strlen(name) + 1);
+		}
+	}
+
+	verbose("%02x %4d %s [canon]\n", csum, secix, sh_name);
+
+} /* end extract_elf32_rela() */
+
+/*****************************************************************************/
+/*
+ * extract a REL table
+ * - need to canonicalise the entries in case section addition/removal has
+ *   rearranged the symbol table and the section table
+ */
+void extract_elf32_rel(const void *buffer, int secix, int targetix,
+		       const Elf32_Rel *relatab, size_t nrels,
+		       const Elf32_Sym *symbols, size_t nsyms,
+		       const Elf32_Shdr *sections, size_t nsects, int *canonmap,
+		       const char *strings, size_t nstrings,
+		       const char *sh_name)
+{
+	struct {
+		uint32_t	r_offset;
+		uint32_t	st_value;
+		uint32_t	st_size;
+		uint16_t	st_shndx;
+		uint8_t		r_type;
+		uint8_t		st_info;
+		uint8_t		st_other;
+
+	} __attribute__((packed)) relocation;
+
+	const Elf32_Sym *symbol;
+	size_t loop;
+
+	/* contribute the relevant bits from a join of { RELA, SYMBOL, SECTION } */
+	for (loop = 0; loop < nrels; loop++) {
+		Elf32_Section st_shndx;
+		Elf32_Word r_info;
+
+		/* decode the relocation */
+		r_info = get32(&relatab[loop].r_info);
+		relocation.r_offset = relatab[loop].r_offset;
+		relocation.r_type = ELF32_R_TYPE(r_info);
+
+		if (ELF32_R_SYM(r_info) >= nsyms) {
+			fprintf(stderr, "Invalid symbol ID %x in relocation %zu\n",
+				ELF32_R_SYM(r_info), loop);
+			exit(1);
+		}
+
+		/* decode the symbol referenced by the relocation */
+		symbol = &symbols[ELF32_R_SYM(r_info)];
+		relocation.st_info = symbol->st_info;
+		relocation.st_other = symbol->st_other;
+		relocation.st_value = symbol->st_value;
+		relocation.st_size = symbol->st_size;
+		relocation.st_shndx = symbol->st_shndx;
+		st_shndx = get16(&symbol->st_shndx);
+
+		/* canonicalise the section used by the symbol */
+		if (st_shndx > SHN_UNDEF && st_shndx < nsects)
+			set16(&relocation.st_shndx, canonmap[st_shndx]);
+		
+		write_out_val(relocation);
+
+		/* undefined symbols must be named if referenced */
+		if (st_shndx == SHN_UNDEF) {
+			const char *name = strings + get32(&symbol->st_name);
+			write_out(name, strlen(name) + 1);
+		}
+	}
+
+	verbose("%02x %4d %s [canon]\n", csum, secix, sh_name);
+
+} /* end extract_elf32_rel() */
+
+/*****************************************************************************/
+/*
+ * extract the data from a 32-bit module
+ */
+void extract_elf32(void *buffer, size_t len, Elf32_Ehdr *hdr)
+{
+	const Elf32_Sym *symbols;
+	Elf32_Shdr *sections;
+	const char *secstrings, *strings;
+	size_t nsyms, nstrings;
+	int loop, shnum, *canonlist, *canonmap, canon, changed, tmp;
+
+	sections = buffer + get32(&hdr->e_shoff);
+	secstrings = buffer + get32(&sections[get16(&hdr->e_shstrndx)].sh_offset);
+	shnum = get16(&hdr->e_shnum);
+
+	/* find the symbol table and the string table and produce a list of
+	 * index numbers of sections that contribute to the kernel's module
+	 * image
+	 */
+	canonlist = calloc(sizeof(int), shnum * 2);
+	if (!canonlist) {
+		perror("calloc");
+		exit(1);
+	}
+	canonmap = canonlist + shnum;
+	canon = 0;
+
+	symbols = NULL;
+	strings = NULL;
+
+	for (loop = 1; loop < shnum; loop++) {
+		const char *sh_name = secstrings + get32(&sections[loop].sh_name);
+		Elf32_Word  sh_type	= get32(&sections[loop].sh_type);
+		Elf32_Xword sh_size	= get32(&sections[loop].sh_size);
+		Elf32_Xword sh_flags	= get32(&sections[loop].sh_flags);
+		Elf32_Off   sh_offset	= get32(&sections[loop].sh_offset);
+		void *data = buffer + sh_offset;
+
+		/* quick sanity check */
+		if (sh_type != SHT_NOBITS && len < sh_offset + sh_size) {
+			fprintf(stderr, "Section goes beyond EOF\n");
+			exit(3);
+		}
+
+		/* we only need to canonicalise allocatable sections */
+		if (sh_flags & SHF_ALLOC)
+			canonlist[canon++] = loop;
+
+		/* keep track of certain special sections */
+		switch (sh_type) {
+		case SHT_SYMTAB:
+			if (strcmp(sh_name, ".symtab") == 0) {
+				symbols = data;
+				nsyms = sh_size / sizeof(Elf32_Sym);
+			}
+			break;
+
+		case SHT_STRTAB:
+			if (strcmp(sh_name, ".strtab") == 0) {
+				strings = data;
+				nstrings = sh_size;
+			}
+			break;
+
+		default:
+			break;
+		}
+	}
+
+	if (!symbols) {
+		fprintf(stderr, "Couldn't locate symbol table\n");
+		exit(3);
+	}
+
+	if (!strings) {
+		fprintf(stderr, "Couldn't locate strings table\n");
+		exit(3);
+	}
+
+	/* canonicalise the index numbers of the contributing section */
+	do {
+		changed = 0;
+
+		for (loop = 0; loop < canon - 1; loop++) {
+			const char *x = secstrings + get32(&sections[canonlist[loop + 0]].sh_name);
+			const char *y = secstrings + get32(&sections[canonlist[loop + 1]].sh_name);
+			if (strcmp(x, y) > 0) {
+				tmp = canonlist[loop + 0];
+				canonlist[loop + 0] = canonlist[loop + 1];
+				canonlist[loop + 1] = tmp;
+				changed = 1;
+			}
+		}
+
+	} while(changed);
+
+	for (loop = 0; loop < canon; loop++)
+		canonmap[canonlist[loop]] = loop + 1;
+
+	if (is_verbose > 1) {
+		printf("\nSection canonicalisation map:\n");
+		for (loop = 1; loop < shnum; loop++) {
+			const char *x = secstrings + get32(&sections[loop].sh_name);
+			printf("%4d %s\n", canonmap[loop], x);
+		}
+
+		printf("\nAllocated section list in canonical order:\n");
+		for (loop = 0; loop < canon; loop++) {
+			const char *x = secstrings + get32(&sections[canonlist[loop]].sh_name);
+			printf("%4d %s\n", canonlist[loop], x);
+		}
+	}
+
+	memset(canonlist, 0, sizeof(int) * shnum);
+
+	/* iterate through the section table looking for sections we want to
+	 * contribute to the signature */
+	verbose("\n");
+	verbose("FILE POS CS SECT NAME\n");
+	verbose("======== == ==== ==============================\n");
+
+	for (loop = 1; loop < shnum; loop++) {
+		const char *sh_name = secstrings + get32(&sections[loop].sh_name);
+		Elf32_Word  sh_type	= get32(&sections[loop].sh_type);
+		Elf32_Xword sh_size	= get32(&sections[loop].sh_size);
+		Elf32_Xword sh_flags	= get32(&sections[loop].sh_flags);
+		Elf32_Word  sh_info	= get32(&sections[loop].sh_info);
+		Elf32_Off   sh_offset	= get32(&sections[loop].sh_offset);
+		void *data = buffer + sh_offset;
+
+		csum = 0;
+
+		/* quick sanity check */
+		if (sh_type != SHT_NOBITS && len < sh_offset + sh_size) {
+			fprintf(stderr, "section goes beyond EOF\n");
+			exit(3);
+		}
+
+		/* include canonicalised relocation sections */
+		if (sh_type == SHT_REL || sh_type == SHT_RELA) {
+			if (sh_info <= 0 && sh_info >= hdr->e_shnum) {
+				fprintf(stderr,
+					"Invalid ELF - REL/RELA sh_info does"
+					" not refer to a valid section\n");
+				exit(3);
+			}
+
+			if (canonlist[sh_info]) {
+				Elf32_Word xsh_info;
+
+				verbose("%08lx ", ftell(outfd));
+
+				set32(&xsh_info, canonmap[sh_info]);
+
+				/* write out selected portions of the section header */
+				write_out(sh_name, strlen(sh_name));
+				write_out_val(sections[loop].sh_type);
+				write_out_val(sections[loop].sh_flags);
+				write_out_val(sections[loop].sh_size);
+				write_out_val(sections[loop].sh_addralign);
+				write_out_val(xsh_info);
+
+				if (sh_type == SHT_RELA)
+					extract_elf32_rela(buffer, loop, sh_info,
+							   data, sh_size / sizeof(Elf32_Rela),
+							   symbols, nsyms,
+							   sections, shnum, canonmap,
+							   strings, nstrings,
+							   sh_name);
+				else
+					extract_elf32_rel(buffer, loop, sh_info,
+							  data, sh_size / sizeof(Elf32_Rel),
+							  symbols, nsyms,
+							  sections, shnum, canonmap,
+							  strings, nstrings,
+							  sh_name);
+			}
+
+			continue;
+		}
+
+		/* include allocatable loadable sections */
+		if (sh_type != SHT_NOBITS && sh_flags & SHF_ALLOC)
+			goto include_section;
+
+		/* not this section */
+		continue;
+
+	include_section:
+		verbose("%08lx ", ftell(outfd));
+
+		/* write out selected portions of the section header */
+		write_out(sh_name, strlen(sh_name));
+		write_out_val(sections[loop].sh_type);
+		write_out_val(sections[loop].sh_flags);
+		write_out_val(sections[loop].sh_size);
+		write_out_val(sections[loop].sh_addralign);
+
+		/* write out the section data */
+		write_out(data, sh_size);
+
+		verbose("%02x %4d %s\n", csum, loop, sh_name);
+
+		/* note the section has been written */
+		canonlist[loop] = 1;
+	}
+
+	verbose("%08lx         (%lu bytes csum 0x%02x)\n",
+		ftell(outfd), ftell(outfd), xcsum);
+
+} /* end extract_elf32() */
diff -urNp --exclude-from=/home/davej/.exclude linux-903/scripts/modsign/modsign.sh linux-904/scripts/modsign/modsign.sh
--- linux-903/scripts/modsign/modsign.sh
+++ linux-904/scripts/modsign/modsign.sh
@@ -0,0 +1,57 @@
+#!/bin/bash
+###############################################################################
+#
+# Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+# Written by David Howells (dhowells@redhat.com)
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version
+# 2 of the License, or (at your option) any later version.
+#
+###############################################################################
+
+verbose=
+
+if [ $# -gt 1 -a "x$1" = "x-v" ]
+    then
+    verbose=-v
+    shift
+fi
+
+if [ $# = 0 ]
+    then
+	echo
+	echo "usage: $0 [-v] <module_to_sign> [<key_name>]"
+	echo
+	exit 1
+fi
+
+module=$1
+
+if [ -z "$KEYFLAGS" ]
+    then
+    KEYFLAGS="--no-default-keyring --secret-keyring ../kernel.sec --keyring ../kernel.pub"
+fi
+
+if [ $# -eq 2 ]
+    then
+    KEYFLAGS="$KEYFLAGS --default-key $2"
+fi
+
+# strip out only the sections that we care about
+scripts/modsign/mod-extract $verbose $module $module.out || exit $?
+
+# sign the sections
+gpg --no-greeting $KEYFLAGS -b $module.out || exit $?
+
+# check the signature
+#gpg --verify rxrpc.ko.out.sig rxrpc.ko.out
+
+## sha1 the sections
+#sha1sum $module.out | awk "{print \$1}" > $module.sha1
+
+# add the encrypted data to the module
+objcopy --add-section .module_sig=$module.out.sig $module $module.signed || exit $?
+objcopy --set-section-flags .module_sig=alloc $module.signed || exit $?
+rm -f $module.out*

Places

File linux-2.6-modsign-script.patch of Package kernel

Places