Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 550 insertions, 0 deletions

diff --git a/fs/binfmt_aout.c b/fs/binfmt_aout.c
new file mode 100644
index 000000000000..009b8920c1ff
--- /dev/null
+++ b/fs/binfmt_aout.c
@@ -0,0 +1,550 @@
+/*
+ *  linux/fs/binfmt_aout.c
+ *
+ *  Copyright (C) 1991, 1992, 1996  Linus Torvalds
+ */
+
+#include <linux/module.h>
+
+#include <linux/time.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/a.out.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/stat.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/slab.h>
+#include <linux/binfmts.h>
+#include <linux/personality.h>
+#include <linux/init.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/cacheflush.h>
+
+static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs);
+static int load_aout_library(struct file*);
+static int aout_core_dump(long signr, struct pt_regs * regs, struct file *file);
+
+extern void dump_thread(struct pt_regs *, struct user *);
+
+static struct linux_binfmt aout_format = {
+	.module		= THIS_MODULE,
+	.load_binary	= load_aout_binary,
+	.load_shlib	= load_aout_library,
+	.core_dump	= aout_core_dump,
+	.min_coredump	= PAGE_SIZE
+};
+
+#define BAD_ADDR(x)	((unsigned long)(x) >= TASK_SIZE)
+
+static int set_brk(unsigned long start, unsigned long end)
+{
+	start = PAGE_ALIGN(start);
+	end = PAGE_ALIGN(end);
+	if (end > start) {
+		unsigned long addr;
+		down_write(&current->mm->mmap_sem);
+		addr = do_brk(start, end - start);
+		up_write(&current->mm->mmap_sem);
+		if (BAD_ADDR(addr))
+			return addr;
+	}
+	return 0;
+}
+
+/*
+ * These are the only things you should do on a core-file: use only these
+ * macros to write out all the necessary info.
+ */
+
+static int dump_write(struct file *file, const void *addr, int nr)
+{
+	return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
+}
+
+#define DUMP_WRITE(addr, nr)	\
+	if (!dump_write(file, (void *)(addr), (nr))) \
+		goto end_coredump;
+
+#define DUMP_SEEK(offset) \
+if (file->f_op->llseek) { \
+	if (file->f_op->llseek(file,(offset),0) != (offset)) \
+ 		goto end_coredump; \
+} else file->f_pos = (offset)
+
+/*
+ * Routine writes a core dump image in the current directory.
+ * Currently only a stub-function.
+ *
+ * Note that setuid/setgid files won't make a core-dump if the uid/gid
+ * changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable"
+ * field, which also makes sure the core-dumps won't be recursive if the
+ * dumping of the process results in another error..
+ */
+
+static int aout_core_dump(long signr, struct pt_regs * regs, struct file *file)
+{
+	mm_segment_t fs;
+	int has_dumped = 0;
+	unsigned long dump_start, dump_size;
+	struct user dump;
+#if defined(__alpha__)
+#       define START_DATA(u)	(u.start_data)
+#elif defined(__arm__)
+#	define START_DATA(u)	((u.u_tsize << PAGE_SHIFT) + u.start_code)
+#elif defined(__sparc__)
+#       define START_DATA(u)    (u.u_tsize)
+#elif defined(__i386__) || defined(__mc68000__) || defined(__arch_um__)
+#       define START_DATA(u)	(u.u_tsize << PAGE_SHIFT)
+#endif
+#ifdef __sparc__
+#       define START_STACK(u)   ((regs->u_regs[UREG_FP]) & ~(PAGE_SIZE - 1))
+#else
+#       define START_STACK(u)   (u.start_stack)
+#endif
+
+	fs = get_fs();
+	set_fs(KERNEL_DS);
+	has_dumped = 1;
+	current->flags |= PF_DUMPCORE;
+       	strncpy(dump.u_comm, current->comm, sizeof(dump.u_comm));
+#ifndef __sparc__
+	dump.u_ar0 = (void *)(((unsigned long)(&dump.regs)) - ((unsigned long)(&dump)));
+#endif
+	dump.signal = signr;
+	dump_thread(regs, &dump);
+
+/* If the size of the dump file exceeds the rlimit, then see what would happen
+   if we wrote the stack, but not the data area.  */
+#ifdef __sparc__
+	if ((dump.u_dsize+dump.u_ssize) >
+	    current->signal->rlim[RLIMIT_CORE].rlim_cur)
+		dump.u_dsize = 0;
+#else
+	if ((dump.u_dsize+dump.u_ssize+1) * PAGE_SIZE >
+	    current->signal->rlim[RLIMIT_CORE].rlim_cur)
+		dump.u_dsize = 0;
+#endif
+
+/* Make sure we have enough room to write the stack and data areas. */
+#ifdef __sparc__
+	if ((dump.u_ssize) >
+	    current->signal->rlim[RLIMIT_CORE].rlim_cur)
+		dump.u_ssize = 0;
+#else
+	if ((dump.u_ssize+1) * PAGE_SIZE >
+	    current->signal->rlim[RLIMIT_CORE].rlim_cur)
+		dump.u_ssize = 0;
+#endif
+
+/* make sure we actually have a data and stack area to dump */
+	set_fs(USER_DS);
+#ifdef __sparc__
+	if (!access_ok(VERIFY_READ, (void __user *)START_DATA(dump), dump.u_dsize))
+		dump.u_dsize = 0;
+	if (!access_ok(VERIFY_READ, (void __user *)START_STACK(dump), dump.u_ssize))
+		dump.u_ssize = 0;
+#else
+	if (!access_ok(VERIFY_READ, (void __user *)START_DATA(dump), dump.u_dsize << PAGE_SHIFT))
+		dump.u_dsize = 0;
+	if (!access_ok(VERIFY_READ, (void __user *)START_STACK(dump), dump.u_ssize << PAGE_SHIFT))
+		dump.u_ssize = 0;
+#endif
+
+	set_fs(KERNEL_DS);
+/* struct user */
+	DUMP_WRITE(&dump,sizeof(dump));
+/* Now dump all of the user data.  Include malloced stuff as well */
+#ifndef __sparc__
+	DUMP_SEEK(PAGE_SIZE);
+#endif
+/* now we start writing out the user space info */
+	set_fs(USER_DS);
+/* Dump the data area */
+	if (dump.u_dsize != 0) {
+		dump_start = START_DATA(dump);
+#ifdef __sparc__
+		dump_size = dump.u_dsize;
+#else
+		dump_size = dump.u_dsize << PAGE_SHIFT;
+#endif
+		DUMP_WRITE(dump_start,dump_size);
+	}
+/* Now prepare to dump the stack area */
+	if (dump.u_ssize != 0) {
+		dump_start = START_STACK(dump);
+#ifdef __sparc__
+		dump_size = dump.u_ssize;
+#else
+		dump_size = dump.u_ssize << PAGE_SHIFT;
+#endif
+		DUMP_WRITE(dump_start,dump_size);
+	}
+/* Finally dump the task struct.  Not be used by gdb, but could be useful */
+	set_fs(KERNEL_DS);
+	DUMP_WRITE(current,sizeof(*current));
+end_coredump:
+	set_fs(fs);
+	return has_dumped;
+}
+
+/*
+ * create_aout_tables() parses the env- and arg-strings in new user
+ * memory and creates the pointer tables from them, and puts their
+ * addresses on the "stack", returning the new stack pointer value.
+ */
+static unsigned long __user *create_aout_tables(char __user *p, struct linux_binprm * bprm)
+{
+	char __user * __user *argv;
+	char __user * __user *envp;
+	unsigned long __user *sp;
+	int argc = bprm->argc;
+	int envc = bprm->envc;
+
+	sp = (void __user *)((-(unsigned long)sizeof(char *)) & (unsigned long) p);
+#ifdef __sparc__
+	/* This imposes the proper stack alignment for a new process. */
+	sp = (void __user *) (((unsigned long) sp) & ~7);
+	if ((envc+argc+3)&1) --sp;
+#endif
+#ifdef __alpha__
+/* whee.. test-programs are so much fun. */
+	put_user(0, --sp);
+	put_user(0, --sp);
+	if (bprm->loader) {
+		put_user(0, --sp);
+		put_user(0x3eb, --sp);
+		put_user(bprm->loader, --sp);
+		put_user(0x3ea, --sp);
+	}
+	put_user(bprm->exec, --sp);
+	put_user(0x3e9, --sp);
+#endif
+	sp -= envc+1;
+	envp = (char __user * __user *) sp;
+	sp -= argc+1;
+	argv = (char __user * __user *) sp;
+#if defined(__i386__) || defined(__mc68000__) || defined(__arm__) || defined(__arch_um__)
+	put_user((unsigned long) envp,--sp);
+	put_user((unsigned long) argv,--sp);
+#endif
+	put_user(argc,--sp);
+	current->mm->arg_start = (unsigned long) p;
+	while (argc-->0) {
+		char c;
+		put_user(p,argv++);
+		do {
+			get_user(c,p++);
+		} while (c);
+	}
+	put_user(NULL,argv);
+	current->mm->arg_end = current->mm->env_start = (unsigned long) p;
+	while (envc-->0) {
+		char c;
+		put_user(p,envp++);
+		do {
+			get_user(c,p++);
+		} while (c);
+	}
+	put_user(NULL,envp);
+	current->mm->env_end = (unsigned long) p;
+	return sp;
+}
+
+/*
+ * These are the functions used to load a.out style executables and shared
+ * libraries.  There is no binary dependent code anywhere else.
+ */
+
+static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
+{
+	struct exec ex;
+	unsigned long error;
+	unsigned long fd_offset;
+	unsigned long rlim;
+	int retval;
+
+	ex = *((struct exec *) bprm->buf);		/* exec-header */
+	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
+	     N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
+	    N_TRSIZE(ex) || N_DRSIZE(ex) ||
+	    i_size_read(bprm->file->f_dentry->d_inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
+		return -ENOEXEC;
+	}
+
+	fd_offset = N_TXTOFF(ex);
+
+	/* Check initial limits. This avoids letting people circumvent
+	 * size limits imposed on them by creating programs with large
+	 * arrays in the data or bss.
+	 */
+	rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
+	if (rlim >= RLIM_INFINITY)
+		rlim = ~0;
+	if (ex.a_data + ex.a_bss > rlim)
+		return -ENOMEM;
+
+	/* Flush all traces of the currently running executable */
+	retval = flush_old_exec(bprm);
+	if (retval)
+		return retval;
+
+	/* OK, This is the point of no return */
+#if defined(__alpha__)
+	SET_AOUT_PERSONALITY(bprm, ex);
+#elif defined(__sparc__)
+	set_personality(PER_SUNOS);
+#if !defined(__sparc_v9__)
+	memcpy(&current->thread.core_exec, &ex, sizeof(struct exec));
+#endif
+#else
+	set_personality(PER_LINUX);
+#endif
+
+	current->mm->end_code = ex.a_text +
+		(current->mm->start_code = N_TXTADDR(ex));
+	current->mm->end_data = ex.a_data +
+		(current->mm->start_data = N_DATADDR(ex));
+	current->mm->brk = ex.a_bss +
+		(current->mm->start_brk = N_BSSADDR(ex));
+	current->mm->free_area_cache = current->mm->mmap_base;
+
+	set_mm_counter(current->mm, rss, 0);
+	current->mm->mmap = NULL;
+	compute_creds(bprm);
+ 	current->flags &= ~PF_FORKNOEXEC;
+#ifdef __sparc__
+	if (N_MAGIC(ex) == NMAGIC) {
+		loff_t pos = fd_offset;
+		/* Fuck me plenty... */
+		/* <AOL></AOL> */
+		down_write(&current->mm->mmap_sem);	
+		error = do_brk(N_TXTADDR(ex), ex.a_text);
+		up_write(&current->mm->mmap_sem);
+		bprm->file->f_op->read(bprm->file, (char *) N_TXTADDR(ex),
+			  ex.a_text, &pos);
+		down_write(&current->mm->mmap_sem);
+		error = do_brk(N_DATADDR(ex), ex.a_data);
+		up_write(&current->mm->mmap_sem);
+		bprm->file->f_op->read(bprm->file, (char *) N_DATADDR(ex),
+			  ex.a_data, &pos);
+		goto beyond_if;
+	}
+#endif
+
+	if (N_MAGIC(ex) == OMAGIC) {
+		unsigned long text_addr, map_size;
+		loff_t pos;
+
+		text_addr = N_TXTADDR(ex);
+
+#if defined(__alpha__) || defined(__sparc__)
+		pos = fd_offset;
+		map_size = ex.a_text+ex.a_data + PAGE_SIZE - 1;
+#else
+		pos = 32;
+		map_size = ex.a_text+ex.a_data;
+#endif
+		down_write(&current->mm->mmap_sem);
+		error = do_brk(text_addr & PAGE_MASK, map_size);
+		up_write(&current->mm->mmap_sem);
+		if (error != (text_addr & PAGE_MASK)) {
+			send_sig(SIGKILL, current, 0);
+			return error;
+		}
+
+		error = bprm->file->f_op->read(bprm->file,
+			  (char __user *)text_addr,
+			  ex.a_text+ex.a_data, &pos);
+		if ((signed long)error < 0) {
+			send_sig(SIGKILL, current, 0);
+			return error;
+		}
+			 
+		flush_icache_range(text_addr, text_addr+ex.a_text+ex.a_data);
+	} else {
+		static unsigned long error_time, error_time2;
+		if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
+		    (N_MAGIC(ex) != NMAGIC) && (jiffies-error_time2) > 5*HZ)
+		{
+			printk(KERN_NOTICE "executable not page aligned\n");
+			error_time2 = jiffies;
+		}
+
+		if ((fd_offset & ~PAGE_MASK) != 0 &&
+		    (jiffies-error_time) > 5*HZ)
+		{
+			printk(KERN_WARNING 
+			       "fd_offset is not page aligned. Please convert program: %s\n",
+			       bprm->file->f_dentry->d_name.name);
+			error_time = jiffies;
+		}
+
+		if (!bprm->file->f_op->mmap||((fd_offset & ~PAGE_MASK) != 0)) {
+			loff_t pos = fd_offset;
+			down_write(&current->mm->mmap_sem);
+			do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
+			up_write(&current->mm->mmap_sem);
+			bprm->file->f_op->read(bprm->file,
+					(char __user *)N_TXTADDR(ex),
+					ex.a_text+ex.a_data, &pos);
+			flush_icache_range((unsigned long) N_TXTADDR(ex),
+					   (unsigned long) N_TXTADDR(ex) +
+					   ex.a_text+ex.a_data);
+			goto beyond_if;
+		}
+
+		down_write(&current->mm->mmap_sem);
+		error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
+			PROT_READ | PROT_EXEC,
+			MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
+			fd_offset);
+		up_write(&current->mm->mmap_sem);
+
+		if (error != N_TXTADDR(ex)) {
+			send_sig(SIGKILL, current, 0);
+			return error;
+		}
+
+		down_write(&current->mm->mmap_sem);
+ 		error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
+				PROT_READ | PROT_WRITE | PROT_EXEC,
+				MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
+				fd_offset + ex.a_text);
+		up_write(&current->mm->mmap_sem);
+		if (error != N_DATADDR(ex)) {
+			send_sig(SIGKILL, current, 0);
+			return error;
+		}
+	}
+beyond_if:
+	set_binfmt(&aout_format);
+
+	retval = set_brk(current->mm->start_brk, current->mm->brk);
+	if (retval < 0) {
+		send_sig(SIGKILL, current, 0);
+		return retval;
+	}
+
+	retval = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
+	if (retval < 0) { 
+		/* Someone check-me: is this error path enough? */ 
+		send_sig(SIGKILL, current, 0); 
+		return retval;
+	}
+
+	current->mm->start_stack =
+		(unsigned long) create_aout_tables((char __user *) bprm->p, bprm);
+#ifdef __alpha__
+	regs->gp = ex.a_gpvalue;
+#endif
+	start_thread(regs, ex.a_entry, current->mm->start_stack);
+	if (unlikely(current->ptrace & PT_PTRACED)) {
+		if (current->ptrace & PT_TRACE_EXEC)
+			ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
+		else
+			send_sig(SIGTRAP, current, 0);
+	}
+	return 0;
+}
+
+static int load_aout_library(struct file *file)
+{
+	struct inode * inode;
+	unsigned long bss, start_addr, len;
+	unsigned long error;
+	int retval;
+	struct exec ex;
+
+	inode = file->f_dentry->d_inode;
+
+	retval = -ENOEXEC;
+	error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
+	if (error != sizeof(ex))
+		goto out;
+
+	/* We come in here for the regular a.out style of shared libraries */
+	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) ||
+	    N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
+	    i_size_read(inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
+		goto out;
+	}
+
+	if (N_FLAGS(ex))
+		goto out;
+
+	/* For  QMAGIC, the starting address is 0x20 into the page.  We mask
+	   this off to get the starting address for the page */
+
+	start_addr =  ex.a_entry & 0xfffff000;
+
+	if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
+		static unsigned long error_time;
+		loff_t pos = N_TXTOFF(ex);
+
+		if ((jiffies-error_time) > 5*HZ)
+		{
+			printk(KERN_WARNING 
+			       "N_TXTOFF is not page aligned. Please convert library: %s\n",
+			       file->f_dentry->d_name.name);
+			error_time = jiffies;
+		}
+		down_write(&current->mm->mmap_sem);
+		do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
+		up_write(&current->mm->mmap_sem);
+		
+		file->f_op->read(file, (char __user *)start_addr,
+			ex.a_text + ex.a_data, &pos);
+		flush_icache_range((unsigned long) start_addr,
+				   (unsigned long) start_addr + ex.a_text + ex.a_data);
+
+		retval = 0;
+		goto out;
+	}
+	/* Now use mmap to map the library into memory. */
+	down_write(&current->mm->mmap_sem);
+	error = do_mmap(file, start_addr, ex.a_text + ex.a_data,
+			PROT_READ | PROT_WRITE | PROT_EXEC,
+			MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
+			N_TXTOFF(ex));
+	up_write(&current->mm->mmap_sem);
+	retval = error;
+	if (error != start_addr)
+		goto out;
+
+	len = PAGE_ALIGN(ex.a_text + ex.a_data);
+	bss = ex.a_text + ex.a_data + ex.a_bss;
+	if (bss > len) {
+		down_write(&current->mm->mmap_sem);
+		error = do_brk(start_addr + len, bss - len);
+		up_write(&current->mm->mmap_sem);
+		retval = error;
+		if (error != start_addr + len)
+			goto out;
+	}
+	retval = 0;
+out:
+	return retval;
+}
+
+static int __init init_aout_binfmt(void)
+{
+	return register_binfmt(&aout_format);
+}
+
+static void __exit exit_aout_binfmt(void)
+{
+	unregister_binfmt(&aout_format);
+}
+
+core_initcall(init_aout_binfmt);
+module_exit(exit_aout_binfmt);
+MODULE_LICENSE("GPL");