Initial import of fixelfprot-20040714 into the packages collection.

This program was written by Chuck Silvers.

	Fix up the permission bits for the program load section containing the
	.got section of a PPC ELF binary.

4 files changed, 218 insertions, 0 deletions

diff --git a/sysutils/fixelfprot/DESCR b/sysutils/fixelfprot/DESCR
new file mode 100644
index 00000000000..b2af2a268e9
--- /dev/null
+++ b/sysutils/fixelfprot/DESCR
@@ -0,0 +1,2 @@
+Fix up the permission bits for the program load section containing the
+.got section of a PPC ELF binary.
diff --git a/sysutils/fixelfprot/Makefile b/sysutils/fixelfprot/Makefile
new file mode 100644
index 00000000000..d8b0e67e582
--- /dev/null
+++ b/sysutils/fixelfprot/Makefile
@@ -0,0 +1,32 @@
+# $NetBSD: Makefile,v 1.1.1.1 2004/07/15 09:28:15 agc Exp $
+
+DISTNAME=	fixelfprot-20040714
+CATEGORIES=	sysutils
+MASTER_SITES=	# empty
+DISTFILES=	# empty
+
+MAINTAINER=	tech-pkg@NetBSD.org
+HOMEPAGE=	http://mail-index.netbsd.org/tech-kern/2004/07/11/0002.html
+COMMENT=	C program to fix ELF protection on .got table for PowerPC
+
+ONLY_FOR_PLATFORM=	NetBSD-*-powerpc
+
+PKG_INSTALLATION_TYPES=	overwrite pkgviews
+
+WRKSRC=		${WRKDIR}
+NO_CHECKSUM=	# defined - sources are part of pkgsrc entry
+NO_BUILDLINK=	# defined
+NO_CONFIGURE=	# defined
+
+INSTALLATION_DIRS=	bin
+
+do-extract:
+	${CP} ${FILESDIR}/fixelfprot.c ${WRKSRC}
+
+do-build:
+	cd ${WRKSRC} && ${CC} ${CFLAGS} fixelfprot.c -o fixelfprot
+
+do-install:
+	${INSTALL_PROGRAM} ${WRKSRC}/fixelfprot ${PREFIX}/sbin
+
+.include "../../mk/bsd.pkg.mk"
diff --git a/sysutils/fixelfprot/PLIST b/sysutils/fixelfprot/PLIST
new file mode 100644
index 00000000000..c5e621ede46
--- /dev/null
+++ b/sysutils/fixelfprot/PLIST
@@ -0,0 +1,2 @@
+@comment $NetBSD: PLIST,v 1.1.1.1 2004/07/15 09:28:15 agc Exp $
+sbin/fixelfprot
diff --git a/sysutils/fixelfprot/files/fixelfprot.c b/sysutils/fixelfprot/files/fixelfprot.c
new file mode 100644
index 00000000000..6277e9214f7
--- /dev/null
+++ b/sysutils/fixelfprot/files/fixelfprot.c
@@ -0,0 +1,182 @@
+/*
+ * Fix up the permission bits for the program load section containing the
+ * .got section of a PPC ELF binary.
+ */
+
+#include <stdio.h>
+#include <err.h>
+#define ELFSIZE 32
+#include <sys/exec_elf.h>
+#include <sys/endian.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <string.h>
+
+void xlseek(int, off_t, int);
+void xread(int, void *, size_t);
+void xwrite(int, void *, size_t);
+void *xmalloc(size_t);
+
+void
+xlseek(int fd, off_t off, int whence)
+{
+	int rv;
+
+	rv = lseek(fd, off, whence);
+	if (rv < 0) {
+		err(1, "lseek");
+	}
+}
+
+void
+xread(int fd, void *buf, size_t size)
+{
+	int rv;
+
+	rv = read(fd, buf, size);
+	if (rv < 0) {
+		err(1, "read");
+	}
+	if (rv != size) {
+		errx(1, "short read %d vs. %d", rv, size);
+	}
+}
+
+void
+xwrite(int fd, void *buf, size_t size)
+{
+	int rv;
+
+	rv = write(fd, buf, size);
+	if (rv < 0) {
+		err(1, "write");
+	}
+	if (rv != size) {
+		errx(1, "short write %d vs. %d", rv, size);
+	}
+}
+
+
+void *
+xmalloc(size_t size)
+{
+	void *buf;
+
+	buf = malloc(size);
+	if (buf == NULL) {
+		err(1, "malloc");
+	}
+	return buf;
+}
+
+int
+main(int argc, char **argv)
+{
+	Elf32_Ehdr eh;
+	Elf32_Phdr *ph;
+	Elf32_Shdr *sh;
+	Elf32_Addr gotaddr;
+	size_t phsize, shsize, strsize;
+	char *strbuf;
+	int fd, i, idx;
+
+	/*
+	 * Check arguments and open the file.
+	 */
+
+	if (argc != 2) {
+		errx(1, "usage: %s <file>", getprogname());
+	}
+	fd = open(argv[1], O_RDWR);
+	if (fd < 0) {
+		err(1, "open %s", argv[1]);
+	}
+
+	/*
+	 * Read and validate the ELF header.
+	 */
+
+	xread(fd, &eh, sizeof (eh));
+	if (memcmp(eh.e_ident, ELFMAG, SELFMAG) != 0 ||
+	    eh.e_ident[EI_CLASS] != ELFCLASS) {
+		errx(1, "not an ELF file");
+	}
+	if (be16toh(eh.e_machine) != EM_PPC) {
+		errx(1, "ELF file is wrong architecture");
+	}
+	if (be16toh(eh.e_type) != ET_EXEC) {
+		errx(1, "ELF file is not an executable");
+	}
+	if (be16toh(eh.e_shnum) > 512 || be16toh(eh.e_phnum) > 128) {
+		errx(1, "ELF file has too many sections");
+	}
+	if (be16toh(eh.e_shstrndx) >= be16toh(eh.e_shnum)) {
+		errx(1, "string table index out of range");
+	}
+
+	/*
+	 * Read the program headers, section headers and string table.
+	 */
+
+	phsize = be16toh(eh.e_phnum) * sizeof(Elf_Phdr);
+	ph = xmalloc(phsize);
+	xlseek(fd, (off_t)be32toh(eh.e_phoff), SEEK_SET);
+	xread(fd, ph, phsize);
+
+	shsize = be16toh(eh.e_shnum) * sizeof(Elf_Shdr);
+	sh = xmalloc(shsize);
+	xlseek(fd, (off_t)be32toh(eh.e_shoff), SEEK_SET);
+	xread(fd, sh, shsize);
+
+	idx = be16toh(eh.e_shstrndx);
+	strsize = be32toh(sh[idx].sh_size);
+	strbuf = xmalloc(strsize);
+	xlseek(fd, (off_t)be32toh(sh[idx].sh_offset), SEEK_SET);
+	xread(fd, strbuf, strsize);
+
+	/*
+	 * Find the .got section.
+	 */
+
+	gotaddr = 0;
+	for (i = 0; i < be16toh(eh.e_shnum); i++) {
+		if (strcmp(&strbuf[be32toh(sh[i].sh_name)], ".got") == 0) {
+			gotaddr = be32toh(sh[i].sh_addr);
+			break;
+		}
+	}
+	if (gotaddr == 0) {
+		errx(1, "couldn't find the .got section");
+	}
+
+	/*
+	 * Find the program header load section containing the .got section.
+	 */
+
+	idx = -1;
+	for (i = 0; i < be16toh(eh.e_phnum); i++) {
+		if (be32toh(ph[i].p_type) == PT_LOAD &&
+		    gotaddr >= be32toh(ph[i].p_vaddr) &&
+		    gotaddr < be32toh(ph[i].p_vaddr) + be32toh(ph[i].p_memsz)) {
+			idx = i;
+		}
+	}
+	if (idx == -1) {
+		errx(1, "couldn't find program header for .got");
+	}
+	if (be32toh(ph[idx].p_flags) & PF_X) {
+		errx(1, "permission bits already include execute");
+	}
+
+	/*
+	 * Add execute permission and write back the entry.
+	 */
+
+	ph[idx].p_flags |= be32toh(PF_X);
+	xlseek(fd, (off_t)be32toh(eh.e_phoff), SEEK_SET);
+	xwrite(fd, ph, phsize);
+
+	errx(0, "execute permission added");
+	exit(0);
+}