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author | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
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committer | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
commit | 871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch) | |
tree | 8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/fs/binfmt_misc.c | |
parent | 9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff) | |
download | FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.tar.gz FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.tar.bz2 FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.zip |
Moved, renamed, and deleted files
The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/fs/binfmt_misc.c')
-rw-r--r-- | ANDROID_3.4.5/fs/binfmt_misc.c | 743 |
1 files changed, 0 insertions, 743 deletions
diff --git a/ANDROID_3.4.5/fs/binfmt_misc.c b/ANDROID_3.4.5/fs/binfmt_misc.c deleted file mode 100644 index 613aa061..00000000 --- a/ANDROID_3.4.5/fs/binfmt_misc.c +++ /dev/null @@ -1,743 +0,0 @@ -/* - * binfmt_misc.c - * - * Copyright (C) 1997 Richard Günther - * - * binfmt_misc detects binaries via a magic or filename extension and invokes - * a specified wrapper. This should obsolete binfmt_java, binfmt_em86 and - * binfmt_mz. - * - * 1997-04-25 first version - * [...] - * 1997-05-19 cleanup - * 1997-06-26 hpa: pass the real filename rather than argv[0] - * 1997-06-30 minor cleanup - * 1997-08-09 removed extension stripping, locking cleanup - * 2001-02-28 AV: rewritten into something that resembles C. Original didn't. - */ - -#include <linux/module.h> -#include <linux/init.h> -#include <linux/sched.h> -#include <linux/magic.h> -#include <linux/binfmts.h> -#include <linux/slab.h> -#include <linux/ctype.h> -#include <linux/file.h> -#include <linux/pagemap.h> -#include <linux/namei.h> -#include <linux/mount.h> -#include <linux/syscalls.h> -#include <linux/fs.h> - -#include <asm/uaccess.h> - -enum { - VERBOSE_STATUS = 1 /* make it zero to save 400 bytes kernel memory */ -}; - -static LIST_HEAD(entries); -static int enabled = 1; - -enum {Enabled, Magic}; -#define MISC_FMT_PRESERVE_ARGV0 (1<<31) -#define MISC_FMT_OPEN_BINARY (1<<30) -#define MISC_FMT_CREDENTIALS (1<<29) - -typedef struct { - struct list_head list; - unsigned long flags; /* type, status, etc. */ - int offset; /* offset of magic */ - int size; /* size of magic/mask */ - char *magic; /* magic or filename extension */ - char *mask; /* mask, NULL for exact match */ - char *interpreter; /* filename of interpreter */ - char *name; - struct dentry *dentry; -} Node; - -static DEFINE_RWLOCK(entries_lock); -static struct file_system_type bm_fs_type; -static struct vfsmount *bm_mnt; -static int entry_count; - -/* - * Check if we support the binfmt - * if we do, return the node, else NULL - * locking is done in load_misc_binary - */ -static Node *check_file(struct linux_binprm *bprm) -{ - char *p = strrchr(bprm->interp, '.'); - struct list_head *l; - - list_for_each(l, &entries) { - Node *e = list_entry(l, Node, list); - char *s; - int j; - - if (!test_bit(Enabled, &e->flags)) - continue; - - if (!test_bit(Magic, &e->flags)) { - if (p && !strcmp(e->magic, p + 1)) - return e; - continue; - } - - s = bprm->buf + e->offset; - if (e->mask) { - for (j = 0; j < e->size; j++) - if ((*s++ ^ e->magic[j]) & e->mask[j]) - break; - } else { - for (j = 0; j < e->size; j++) - if ((*s++ ^ e->magic[j])) - break; - } - if (j == e->size) - return e; - } - return NULL; -} - -/* - * the loader itself - */ -static int load_misc_binary(struct linux_binprm *bprm, struct pt_regs *regs) -{ - Node *fmt; - struct file * interp_file = NULL; - char iname[BINPRM_BUF_SIZE]; - const char *iname_addr = iname; - int retval; - int fd_binary = -1; - - retval = -ENOEXEC; - if (!enabled) - goto _ret; - - retval = -ENOEXEC; - if (bprm->recursion_depth > BINPRM_MAX_RECURSION) - goto _ret; - - /* to keep locking time low, we copy the interpreter string */ - read_lock(&entries_lock); - fmt = check_file(bprm); - if (fmt) - strlcpy(iname, fmt->interpreter, BINPRM_BUF_SIZE); - read_unlock(&entries_lock); - if (!fmt) - goto _ret; - - if (!(fmt->flags & MISC_FMT_PRESERVE_ARGV0)) { - retval = remove_arg_zero(bprm); - if (retval) - goto _ret; - } - - if (fmt->flags & MISC_FMT_OPEN_BINARY) { - - /* if the binary should be opened on behalf of the - * interpreter than keep it open and assign descriptor - * to it */ - fd_binary = get_unused_fd(); - if (fd_binary < 0) { - retval = fd_binary; - goto _ret; - } - fd_install(fd_binary, bprm->file); - - /* if the binary is not readable than enforce mm->dumpable=0 - regardless of the interpreter's permissions */ - would_dump(bprm, bprm->file); - - allow_write_access(bprm->file); - bprm->file = NULL; - - /* mark the bprm that fd should be passed to interp */ - bprm->interp_flags |= BINPRM_FLAGS_EXECFD; - bprm->interp_data = fd_binary; - - } else { - allow_write_access(bprm->file); - fput(bprm->file); - bprm->file = NULL; - } - /* make argv[1] be the path to the binary */ - retval = copy_strings_kernel (1, &bprm->interp, bprm); - if (retval < 0) - goto _error; - bprm->argc++; - - /* add the interp as argv[0] */ - retval = copy_strings_kernel (1, &iname_addr, bprm); - if (retval < 0) - goto _error; - bprm->argc ++; - - bprm->interp = iname; /* for binfmt_script */ - - interp_file = open_exec (iname); - retval = PTR_ERR (interp_file); - if (IS_ERR (interp_file)) - goto _error; - - bprm->file = interp_file; - if (fmt->flags & MISC_FMT_CREDENTIALS) { - /* - * No need to call prepare_binprm(), it's already been - * done. bprm->buf is stale, update from interp_file. - */ - memset(bprm->buf, 0, BINPRM_BUF_SIZE); - retval = kernel_read(bprm->file, 0, bprm->buf, BINPRM_BUF_SIZE); - } else - retval = prepare_binprm (bprm); - - if (retval < 0) - goto _error; - - bprm->recursion_depth++; - - retval = search_binary_handler (bprm, regs); - if (retval < 0) - goto _error; - -_ret: - return retval; -_error: - if (fd_binary > 0) - sys_close(fd_binary); - bprm->interp_flags = 0; - bprm->interp_data = 0; - goto _ret; -} - -/* Command parsers */ - -/* - * parses and copies one argument enclosed in del from *sp to *dp, - * recognising the \x special. - * returns pointer to the copied argument or NULL in case of an - * error (and sets err) or null argument length. - */ -static char *scanarg(char *s, char del) -{ - char c; - - while ((c = *s++) != del) { - if (c == '\\' && *s == 'x') { - s++; - if (!isxdigit(*s++)) - return NULL; - if (!isxdigit(*s++)) - return NULL; - } - } - return s; -} - -static int unquote(char *from) -{ - char c = 0, *s = from, *p = from; - - while ((c = *s++) != '\0') { - if (c == '\\' && *s == 'x') { - s++; - c = toupper(*s++); - *p = (c - (isdigit(c) ? '0' : 'A' - 10)) << 4; - c = toupper(*s++); - *p++ |= c - (isdigit(c) ? '0' : 'A' - 10); - continue; - } - *p++ = c; - } - return p - from; -} - -static char * check_special_flags (char * sfs, Node * e) -{ - char * p = sfs; - int cont = 1; - - /* special flags */ - while (cont) { - switch (*p) { - case 'P': - p++; - e->flags |= MISC_FMT_PRESERVE_ARGV0; - break; - case 'O': - p++; - e->flags |= MISC_FMT_OPEN_BINARY; - break; - case 'C': - p++; - /* this flags also implies the - open-binary flag */ - e->flags |= (MISC_FMT_CREDENTIALS | - MISC_FMT_OPEN_BINARY); - break; - default: - cont = 0; - } - } - - return p; -} -/* - * This registers a new binary format, it recognises the syntax - * ':name:type:offset:magic:mask:interpreter:flags' - * where the ':' is the IFS, that can be chosen with the first char - */ -static Node *create_entry(const char __user *buffer, size_t count) -{ - Node *e; - int memsize, err; - char *buf, *p; - char del; - - /* some sanity checks */ - err = -EINVAL; - if ((count < 11) || (count > 256)) - goto out; - - err = -ENOMEM; - memsize = sizeof(Node) + count + 8; - e = kmalloc(memsize, GFP_USER); - if (!e) - goto out; - - p = buf = (char *)e + sizeof(Node); - - memset(e, 0, sizeof(Node)); - if (copy_from_user(buf, buffer, count)) - goto Efault; - - del = *p++; /* delimeter */ - - memset(buf+count, del, 8); - - e->name = p; - p = strchr(p, del); - if (!p) - goto Einval; - *p++ = '\0'; - if (!e->name[0] || - !strcmp(e->name, ".") || - !strcmp(e->name, "..") || - strchr(e->name, '/')) - goto Einval; - switch (*p++) { - case 'E': e->flags = 1<<Enabled; break; - case 'M': e->flags = (1<<Enabled) | (1<<Magic); break; - default: goto Einval; - } - if (*p++ != del) - goto Einval; - if (test_bit(Magic, &e->flags)) { - char *s = strchr(p, del); - if (!s) - goto Einval; - *s++ = '\0'; - e->offset = simple_strtoul(p, &p, 10); - if (*p++) - goto Einval; - e->magic = p; - p = scanarg(p, del); - if (!p) - goto Einval; - p[-1] = '\0'; - if (!e->magic[0]) - goto Einval; - e->mask = p; - p = scanarg(p, del); - if (!p) - goto Einval; - p[-1] = '\0'; - if (!e->mask[0]) - e->mask = NULL; - e->size = unquote(e->magic); - if (e->mask && unquote(e->mask) != e->size) - goto Einval; - if (e->size + e->offset > BINPRM_BUF_SIZE) - goto Einval; - } else { - p = strchr(p, del); - if (!p) - goto Einval; - *p++ = '\0'; - e->magic = p; - p = strchr(p, del); - if (!p) - goto Einval; - *p++ = '\0'; - if (!e->magic[0] || strchr(e->magic, '/')) - goto Einval; - p = strchr(p, del); - if (!p) - goto Einval; - *p++ = '\0'; - } - e->interpreter = p; - p = strchr(p, del); - if (!p) - goto Einval; - *p++ = '\0'; - if (!e->interpreter[0]) - goto Einval; - - - p = check_special_flags (p, e); - - if (*p == '\n') - p++; - if (p != buf + count) - goto Einval; - return e; - -out: - return ERR_PTR(err); - -Efault: - kfree(e); - return ERR_PTR(-EFAULT); -Einval: - kfree(e); - return ERR_PTR(-EINVAL); -} - -/* - * Set status of entry/binfmt_misc: - * '1' enables, '0' disables and '-1' clears entry/binfmt_misc - */ -static int parse_command(const char __user *buffer, size_t count) -{ - char s[4]; - - if (!count) - return 0; - if (count > 3) - return -EINVAL; - if (copy_from_user(s, buffer, count)) - return -EFAULT; - if (s[count-1] == '\n') - count--; - if (count == 1 && s[0] == '0') - return 1; - if (count == 1 && s[0] == '1') - return 2; - if (count == 2 && s[0] == '-' && s[1] == '1') - return 3; - return -EINVAL; -} - -/* generic stuff */ - -static void entry_status(Node *e, char *page) -{ - char *dp; - char *status = "disabled"; - const char * flags = "flags: "; - - if (test_bit(Enabled, &e->flags)) - status = "enabled"; - - if (!VERBOSE_STATUS) { - sprintf(page, "%s\n", status); - return; - } - - sprintf(page, "%s\ninterpreter %s\n", status, e->interpreter); - dp = page + strlen(page); - - /* print the special flags */ - sprintf (dp, "%s", flags); - dp += strlen (flags); - if (e->flags & MISC_FMT_PRESERVE_ARGV0) { - *dp ++ = 'P'; - } - if (e->flags & MISC_FMT_OPEN_BINARY) { - *dp ++ = 'O'; - } - if (e->flags & MISC_FMT_CREDENTIALS) { - *dp ++ = 'C'; - } - *dp ++ = '\n'; - - - if (!test_bit(Magic, &e->flags)) { - sprintf(dp, "extension .%s\n", e->magic); - } else { - int i; - - sprintf(dp, "offset %i\nmagic ", e->offset); - dp = page + strlen(page); - for (i = 0; i < e->size; i++) { - sprintf(dp, "%02x", 0xff & (int) (e->magic[i])); - dp += 2; - } - if (e->mask) { - sprintf(dp, "\nmask "); - dp += 6; - for (i = 0; i < e->size; i++) { - sprintf(dp, "%02x", 0xff & (int) (e->mask[i])); - dp += 2; - } - } - *dp++ = '\n'; - *dp = '\0'; - } -} - -static struct inode *bm_get_inode(struct super_block *sb, int mode) -{ - struct inode * inode = new_inode(sb); - - if (inode) { - inode->i_ino = get_next_ino(); - inode->i_mode = mode; - inode->i_atime = inode->i_mtime = inode->i_ctime = - current_fs_time(inode->i_sb); - } - return inode; -} - -static void bm_evict_inode(struct inode *inode) -{ - end_writeback(inode); - kfree(inode->i_private); -} - -static void kill_node(Node *e) -{ - struct dentry *dentry; - - write_lock(&entries_lock); - dentry = e->dentry; - if (dentry) { - list_del_init(&e->list); - e->dentry = NULL; - } - write_unlock(&entries_lock); - - if (dentry) { - drop_nlink(dentry->d_inode); - d_drop(dentry); - dput(dentry); - simple_release_fs(&bm_mnt, &entry_count); - } -} - -/* /<entry> */ - -static ssize_t -bm_entry_read(struct file * file, char __user * buf, size_t nbytes, loff_t *ppos) -{ - Node *e = file->f_path.dentry->d_inode->i_private; - ssize_t res; - char *page; - - if (!(page = (char*) __get_free_page(GFP_KERNEL))) - return -ENOMEM; - - entry_status(e, page); - - res = simple_read_from_buffer(buf, nbytes, ppos, page, strlen(page)); - - free_page((unsigned long) page); - return res; -} - -static ssize_t bm_entry_write(struct file *file, const char __user *buffer, - size_t count, loff_t *ppos) -{ - struct dentry *root; - Node *e = file->f_path.dentry->d_inode->i_private; - int res = parse_command(buffer, count); - - switch (res) { - case 1: clear_bit(Enabled, &e->flags); - break; - case 2: set_bit(Enabled, &e->flags); - break; - case 3: root = dget(file->f_path.dentry->d_sb->s_root); - mutex_lock(&root->d_inode->i_mutex); - - kill_node(e); - - mutex_unlock(&root->d_inode->i_mutex); - dput(root); - break; - default: return res; - } - return count; -} - -static const struct file_operations bm_entry_operations = { - .read = bm_entry_read, - .write = bm_entry_write, - .llseek = default_llseek, -}; - -/* /register */ - -static ssize_t bm_register_write(struct file *file, const char __user *buffer, - size_t count, loff_t *ppos) -{ - Node *e; - struct inode *inode; - struct dentry *root, *dentry; - struct super_block *sb = file->f_path.dentry->d_sb; - int err = 0; - - e = create_entry(buffer, count); - - if (IS_ERR(e)) - return PTR_ERR(e); - - root = dget(sb->s_root); - mutex_lock(&root->d_inode->i_mutex); - dentry = lookup_one_len(e->name, root, strlen(e->name)); - err = PTR_ERR(dentry); - if (IS_ERR(dentry)) - goto out; - - err = -EEXIST; - if (dentry->d_inode) - goto out2; - - inode = bm_get_inode(sb, S_IFREG | 0644); - - err = -ENOMEM; - if (!inode) - goto out2; - - err = simple_pin_fs(&bm_fs_type, &bm_mnt, &entry_count); - if (err) { - iput(inode); - inode = NULL; - goto out2; - } - - e->dentry = dget(dentry); - inode->i_private = e; - inode->i_fop = &bm_entry_operations; - - d_instantiate(dentry, inode); - write_lock(&entries_lock); - list_add(&e->list, &entries); - write_unlock(&entries_lock); - - err = 0; -out2: - dput(dentry); -out: - mutex_unlock(&root->d_inode->i_mutex); - dput(root); - - if (err) { - kfree(e); - return -EINVAL; - } - return count; -} - -static const struct file_operations bm_register_operations = { - .write = bm_register_write, - .llseek = noop_llseek, -}; - -/* /status */ - -static ssize_t -bm_status_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) -{ - char *s = enabled ? "enabled\n" : "disabled\n"; - - return simple_read_from_buffer(buf, nbytes, ppos, s, strlen(s)); -} - -static ssize_t bm_status_write(struct file * file, const char __user * buffer, - size_t count, loff_t *ppos) -{ - int res = parse_command(buffer, count); - struct dentry *root; - - switch (res) { - case 1: enabled = 0; break; - case 2: enabled = 1; break; - case 3: root = dget(file->f_path.dentry->d_sb->s_root); - mutex_lock(&root->d_inode->i_mutex); - - while (!list_empty(&entries)) - kill_node(list_entry(entries.next, Node, list)); - - mutex_unlock(&root->d_inode->i_mutex); - dput(root); - default: return res; - } - return count; -} - -static const struct file_operations bm_status_operations = { - .read = bm_status_read, - .write = bm_status_write, - .llseek = default_llseek, -}; - -/* Superblock handling */ - -static const struct super_operations s_ops = { - .statfs = simple_statfs, - .evict_inode = bm_evict_inode, -}; - -static int bm_fill_super(struct super_block * sb, void * data, int silent) -{ - static struct tree_descr bm_files[] = { - [2] = {"status", &bm_status_operations, S_IWUSR|S_IRUGO}, - [3] = {"register", &bm_register_operations, S_IWUSR}, - /* last one */ {""} - }; - int err = simple_fill_super(sb, BINFMTFS_MAGIC, bm_files); - if (!err) - sb->s_op = &s_ops; - return err; -} - -static struct dentry *bm_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) -{ - return mount_single(fs_type, flags, data, bm_fill_super); -} - -static struct linux_binfmt misc_format = { - .module = THIS_MODULE, - .load_binary = load_misc_binary, -}; - -static struct file_system_type bm_fs_type = { - .owner = THIS_MODULE, - .name = "binfmt_misc", - .mount = bm_mount, - .kill_sb = kill_litter_super, -}; - -static int __init init_misc_binfmt(void) -{ - int err = register_filesystem(&bm_fs_type); - if (!err) - insert_binfmt(&misc_format); - return err; -} - -static void __exit exit_misc_binfmt(void) -{ - unregister_binfmt(&misc_format); - unregister_filesystem(&bm_fs_type); -} - -core_initcall(init_misc_binfmt); -module_exit(exit_misc_binfmt); -MODULE_LICENSE("GPL"); |