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fs/binfmt_misc.c
17.7 KB
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/* |
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* binfmt_misc.c |
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* |
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* Copyright (C) 1997 Richard Günther |
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* |
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* binfmt_misc detects binaries via a magic or filename extension and invokes * a specified wrapper. See Documentation/binfmt_misc.txt for more details. |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/module.h> #include <linux/init.h> |
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#include <linux/sched.h> |
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#include <linux/magic.h> |
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#include <linux/binfmts.h> #include <linux/slab.h> #include <linux/ctype.h> |
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#include <linux/string_helpers.h> |
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#include <linux/file.h> #include <linux/pagemap.h> #include <linux/namei.h> #include <linux/mount.h> #include <linux/syscalls.h> |
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#include <linux/fs.h> |
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#include <linux/uaccess.h> |
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|
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#ifdef DEBUG # define USE_DEBUG 1 #else # define USE_DEBUG 0 #endif |
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enum { VERBOSE_STATUS = 1 /* make it zero to save 400 bytes kernel memory */ }; static LIST_HEAD(entries); static int enabled = 1; enum {Enabled, Magic}; |
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#define MISC_FMT_PRESERVE_ARGV0 (1 << 31) #define MISC_FMT_OPEN_BINARY (1 << 30) #define MISC_FMT_CREDENTIALS (1 << 29) |
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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); |
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static struct file_system_type bm_fs_type; |
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static struct vfsmount *bm_mnt; static int entry_count; |
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/* * Max length of the register string. Determined by: * - 7 delimiters * - name: ~50 bytes * - type: 1 byte * - offset: 3 bytes (has to be smaller than BINPRM_BUF_SIZE) * - magic: 128 bytes (512 in escaped form) * - mask: 128 bytes (512 in escaped form) * - interp: ~50 bytes * - flags: 5 bytes * Round that up a bit, and then back off to hold the internal data * (like struct Node). */ #define MAX_REGISTER_LENGTH 1920 /* |
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* 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; |
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/* Walk all the registered handlers. */ |
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list_for_each(l, &entries) { Node *e = list_entry(l, Node, list); char *s; int j; |
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/* Make sure this one is currently enabled. */ |
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if (!test_bit(Enabled, &e->flags)) continue; |
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/* Do matching based on extension if applicable. */ |
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if (!test_bit(Magic, &e->flags)) { if (p && !strcmp(e->magic, p + 1)) return e; continue; } |
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/* Do matching based on magic & mask. */ |
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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 */ |
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static int load_misc_binary(struct linux_binprm *bprm) |
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{ Node *fmt; |
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struct file *interp_file = NULL; |
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char iname[BINPRM_BUF_SIZE]; |
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const char *iname_addr = iname; |
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int retval; int fd_binary = -1; |
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retval = -ENOEXEC; if (!enabled) |
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goto ret; |
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/* 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) |
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goto ret; |
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|
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/* Need to be able to load the file after exec */ if (bprm->interp_flags & BINPRM_FLAGS_PATH_INACCESSIBLE) return -ENOENT; |
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if (!(fmt->flags & MISC_FMT_PRESERVE_ARGV0)) { |
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retval = remove_arg_zero(bprm); if (retval) |
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goto ret; |
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} if (fmt->flags & MISC_FMT_OPEN_BINARY) { |
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/* if the binary should be opened on behalf of the * interpreter than keep it open and assign descriptor |
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* to it */ |
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fd_binary = get_unused_fd_flags(0); |
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if (fd_binary < 0) { retval = fd_binary; goto ret; } fd_install(fd_binary, bprm->file); |
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/* if the binary is not readable than enforce mm->dumpable=0 regardless of the interpreter's permissions */ |
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would_dump(bprm, bprm->file); |
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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; |
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} else { allow_write_access(bprm->file); fput(bprm->file); bprm->file = NULL; } |
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/* make argv[1] be the path to the binary */ |
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retval = copy_strings_kernel(1, &bprm->interp, bprm); |
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if (retval < 0) |
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goto error; |
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bprm->argc++; /* add the interp as argv[0] */ |
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retval = copy_strings_kernel(1, &iname_addr, bprm); |
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if (retval < 0) |
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goto error; bprm->argc++; |
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|
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/* Update interp in case binfmt_script needs it. */ retval = bprm_change_interp(iname, bprm); if (retval < 0) |
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goto error; |
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|
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interp_file = open_exec(iname); retval = PTR_ERR(interp_file); if (IS_ERR(interp_file)) goto error; |
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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 |
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retval = prepare_binprm(bprm); |
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if (retval < 0) |
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goto error; |
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|
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retval = search_binary_handler(bprm); |
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if (retval < 0) |
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goto error; |
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|
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ret: |
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return retval; |
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error: |
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if (fd_binary > 0) sys_close(fd_binary); bprm->interp_flags = 0; bprm->interp_data = 0; |
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goto ret; |
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} /* 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; } } |
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s[-1] ='\0'; |
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return s; } |
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static char *check_special_flags(char *sfs, Node *e) |
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{ |
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char *p = sfs; |
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int cont = 1; /* special flags */ while (cont) { switch (*p) { |
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case 'P': pr_debug("register: flag: P (preserve argv0) "); p++; e->flags |= MISC_FMT_PRESERVE_ARGV0; break; case 'O': pr_debug("register: flag: O (open binary) "); p++; e->flags |= MISC_FMT_OPEN_BINARY; break; case 'C': pr_debug("register: flag: C (preserve creds) "); p++; /* this flags also implies the open-binary flag */ e->flags |= (MISC_FMT_CREDENTIALS | MISC_FMT_OPEN_BINARY); break; default: cont = 0; |
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} } return p; } |
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|
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/* * 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; |
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pr_debug("register: received %zu bytes ", count); |
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/* some sanity checks */ err = -EINVAL; |
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if ((count < 11) || (count > MAX_REGISTER_LENGTH)) |
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goto out; err = -ENOMEM; memsize = sizeof(Node) + count + 8; |
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e = kmalloc(memsize, GFP_KERNEL); |
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if (!e) goto out; p = buf = (char *)e + sizeof(Node); memset(e, 0, sizeof(Node)); if (copy_from_user(buf, buffer, count)) |
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goto efault; |
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del = *p++; /* delimeter */ |
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pr_debug("register: delim: %#x {%c} ", del, del); /* Pad the buffer with the delim to simplify parsing below. */ |
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memset(buf + count, del, 8); |
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|
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/* Parse the 'name' field. */ |
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e->name = p; p = strchr(p, del); if (!p) |
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goto einval; |
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*p++ = '\0'; if (!e->name[0] || !strcmp(e->name, ".") || !strcmp(e->name, "..") || strchr(e->name, '/')) |
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goto einval; |
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pr_debug("register: name: {%s} ", e->name); /* Parse the 'type' field. */ |
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switch (*p++) { |
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case 'E': pr_debug("register: type: E (extension) "); e->flags = 1 << Enabled; break; case 'M': pr_debug("register: type: M (magic) "); e->flags = (1 << Enabled) | (1 << Magic); break; default: |
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goto einval; |
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} if (*p++ != del) |
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goto einval; |
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|
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if (test_bit(Magic, &e->flags)) { |
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/* Handle the 'M' (magic) format. */ char *s; /* Parse the 'offset' field. */ s = strchr(p, del); |
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if (!s) |
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goto einval; |
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*s++ = '\0'; e->offset = simple_strtoul(p, &p, 10); if (*p++) |
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goto einval; |
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pr_debug("register: offset: %#x ", e->offset); /* Parse the 'magic' field. */ |
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e->magic = p; p = scanarg(p, del); if (!p) |
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goto einval; |
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if (!e->magic[0]) |
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goto einval; |
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if (USE_DEBUG) print_hex_dump_bytes( KBUILD_MODNAME ": register: magic[raw]: ", DUMP_PREFIX_NONE, e->magic, p - e->magic); /* Parse the 'mask' field. */ |
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e->mask = p; p = scanarg(p, del); if (!p) |
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goto einval; |
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if (!e->mask[0]) { |
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e->mask = NULL; |
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pr_debug("register: mask[raw]: none "); } else if (USE_DEBUG) print_hex_dump_bytes( KBUILD_MODNAME ": register: mask[raw]: ", DUMP_PREFIX_NONE, e->mask, p - e->mask); /* * Decode the magic & mask fields. * Note: while we might have accepted embedded NUL bytes from * above, the unescape helpers here will stop at the first one * it encounters. */ |
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e->size = string_unescape_inplace(e->magic, UNESCAPE_HEX); if (e->mask && string_unescape_inplace(e->mask, UNESCAPE_HEX) != e->size) |
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goto einval; |
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if (e->size + e->offset > BINPRM_BUF_SIZE) |
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goto einval; |
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pr_debug("register: magic/mask length: %i ", e->size); if (USE_DEBUG) { print_hex_dump_bytes( KBUILD_MODNAME ": register: magic[decoded]: ", DUMP_PREFIX_NONE, e->magic, e->size); if (e->mask) { int i; |
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419 |
char *masked = kmalloc(e->size, GFP_KERNEL); |
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print_hex_dump_bytes( KBUILD_MODNAME ": register: mask[decoded]: ", DUMP_PREFIX_NONE, e->mask, e->size); if (masked) { for (i = 0; i < e->size; ++i) masked[i] = e->magic[i] & e->mask[i]; print_hex_dump_bytes( KBUILD_MODNAME ": register: magic[masked]: ", DUMP_PREFIX_NONE, masked, e->size); kfree(masked); } } } |
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436 |
} else { |
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/* Handle the 'E' (extension) format. */ /* Skip the 'offset' field. */ |
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p = strchr(p, del); if (!p) |
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goto einval; |
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443 |
*p++ = '\0'; |
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/* Parse the 'magic' field. */ |
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e->magic = p; p = strchr(p, del); if (!p) |
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goto einval; |
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*p++ = '\0'; if (!e->magic[0] || strchr(e->magic, '/')) |
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goto einval; |
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pr_debug("register: extension: {%s} ", e->magic); /* Skip the 'mask' field. */ |
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p = strchr(p, del); if (!p) |
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goto einval; |
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*p++ = '\0'; } |
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/* Parse the 'interpreter' field. */ |
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e->interpreter = p; p = strchr(p, del); if (!p) |
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goto einval; |
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*p++ = '\0'; if (!e->interpreter[0]) |
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goto einval; |
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pr_debug("register: interpreter: {%s} ", e->interpreter); |
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473 |
|
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/* Parse the 'flags' field. */ |
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475 |
p = check_special_flags(p, e); |
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if (*p == ' ') p++; if (p != buf + count) |
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goto einval; |
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return e; out: return ERR_PTR(err); |
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485 |
efault: |
1da177e4c Linux-2.6.12-rc2 |
486 487 |
kfree(e); return ERR_PTR(-EFAULT); |
e6084d4a0 binfmt_misc: clea... |
488 |
einval: |
1da177e4c Linux-2.6.12-rc2 |
489 490 491 492 493 494 495 496 497 498 499 |
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]; |
1da177e4c Linux-2.6.12-rc2 |
500 501 502 503 |
if (count > 3) return -EINVAL; if (copy_from_user(s, buffer, count)) return -EFAULT; |
de8288b1f binfmt_misc: work... |
504 505 |
if (!count) return 0; |
e6084d4a0 binfmt_misc: clea... |
506 507 |
if (s[count - 1] == ' ') |
1da177e4c Linux-2.6.12-rc2 |
508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 |
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"; |
e6084d4a0 binfmt_misc: clea... |
524 |
const char *flags = "flags: "; |
1da177e4c Linux-2.6.12-rc2 |
525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 |
if (test_bit(Enabled, &e->flags)) status = "enabled"; if (!VERBOSE_STATUS) { sprintf(page, "%s ", status); return; } sprintf(page, "%s interpreter %s ", status, e->interpreter); dp = page + strlen(page); /* print the special flags */ |
e6084d4a0 binfmt_misc: clea... |
541 542 543 544 545 546 547 548 549 550 |
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++ = ' '; |
1da177e4c Linux-2.6.12-rc2 |
551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 |
if (!test_bit(Magic, &e->flags)) { sprintf(dp, "extension .%s ", e->magic); } else { int i; sprintf(dp, "offset %i magic ", 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, " mask "); dp += 6; for (i = 0; i < e->size; i++) { sprintf(dp, "%02x", 0xff & (int) (e->mask[i])); dp += 2; } } *dp++ = ' '; *dp = '\0'; } } static struct inode *bm_get_inode(struct super_block *sb, int mode) { |
e6084d4a0 binfmt_misc: clea... |
582 |
struct inode *inode = new_inode(sb); |
1da177e4c Linux-2.6.12-rc2 |
583 584 |
if (inode) { |
85fe4025c fs: do not assign... |
585 |
inode->i_ino = get_next_ino(); |
1da177e4c Linux-2.6.12-rc2 |
586 |
inode->i_mode = mode; |
1da177e4c Linux-2.6.12-rc2 |
587 588 589 590 591 |
inode->i_atime = inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb); } return inode; } |
b57922d97 convert remaining... |
592 |
static void bm_evict_inode(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
593 |
{ |
dbd5768f8 vfs: Rename end_w... |
594 |
clear_inode(inode); |
8e18e2941 [PATCH] inode_die... |
595 |
kfree(inode->i_private); |
1da177e4c Linux-2.6.12-rc2 |
596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 |
} 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) { |
6d6b77f16 filesystems: add ... |
611 |
drop_nlink(dentry->d_inode); |
1da177e4c Linux-2.6.12-rc2 |
612 613 614 615 616 617 618 619 620 |
d_drop(dentry); dput(dentry); simple_release_fs(&bm_mnt, &entry_count); } } /* /<entry> */ static ssize_t |
e6084d4a0 binfmt_misc: clea... |
621 |
bm_entry_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) |
1da177e4c Linux-2.6.12-rc2 |
622 |
{ |
496ad9aa8 new helper: file_... |
623 |
Node *e = file_inode(file)->i_private; |
1da177e4c Linux-2.6.12-rc2 |
624 625 |
ssize_t res; char *page; |
1da177e4c Linux-2.6.12-rc2 |
626 |
|
e6084d4a0 binfmt_misc: clea... |
627 628 |
page = (char *) __get_free_page(GFP_KERNEL); if (!page) |
1da177e4c Linux-2.6.12-rc2 |
629 630 631 |
return -ENOMEM; entry_status(e, page); |
1da177e4c Linux-2.6.12-rc2 |
632 |
|
6e2c10a12 binfmt_misc: use ... |
633 |
res = simple_read_from_buffer(buf, nbytes, ppos, page, strlen(page)); |
1da177e4c Linux-2.6.12-rc2 |
634 635 636 637 638 639 640 641 |
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; |
496ad9aa8 new helper: file_... |
642 |
Node *e = file_inode(file)->i_private; |
1da177e4c Linux-2.6.12-rc2 |
643 644 645 |
int res = parse_command(buffer, count); switch (res) { |
e6084d4a0 binfmt_misc: clea... |
646 647 648 649 650 651 652 653 654 655 656 657 |
case 1: /* Disable this handler. */ clear_bit(Enabled, &e->flags); break; case 2: /* Enable this handler. */ set_bit(Enabled, &e->flags); break; case 3: /* Delete this handler. */ root = dget(file->f_path.dentry->d_sb->s_root); mutex_lock(&root->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
658 |
|
e6084d4a0 binfmt_misc: clea... |
659 |
kill_node(e); |
1da177e4c Linux-2.6.12-rc2 |
660 |
|
e6084d4a0 binfmt_misc: clea... |
661 662 663 664 665 |
mutex_unlock(&root->d_inode->i_mutex); dput(root); break; default: return res; |
1da177e4c Linux-2.6.12-rc2 |
666 |
} |
e6084d4a0 binfmt_misc: clea... |
667 |
|
1da177e4c Linux-2.6.12-rc2 |
668 669 |
return count; } |
4b6f5d20b [PATCH] Make most... |
670 |
static const struct file_operations bm_entry_operations = { |
1da177e4c Linux-2.6.12-rc2 |
671 672 |
.read = bm_entry_read, .write = bm_entry_write, |
6038f373a llseek: automatic... |
673 |
.llseek = default_llseek, |
1da177e4c Linux-2.6.12-rc2 |
674 675 676 677 678 679 680 681 682 683 |
}; /* /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; |
d8c9584ea vfs: prefer ->den... |
684 |
struct super_block *sb = file->f_path.dentry->d_sb; |
1da177e4c Linux-2.6.12-rc2 |
685 686 687 688 689 690 691 692 |
int err = 0; e = create_entry(buffer, count); if (IS_ERR(e)) return PTR_ERR(e); root = dget(sb->s_root); |
1b1dcc1b5 [PATCH] mutex sub... |
693 |
mutex_lock(&root->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
694 695 696 697 698 699 700 701 702 703 704 705 706 707 |
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; |
1f5ce9e93 VFS: Unexport do_... |
708 |
err = simple_pin_fs(&bm_fs_type, &bm_mnt, &entry_count); |
1da177e4c Linux-2.6.12-rc2 |
709 710 711 712 713 714 715 |
if (err) { iput(inode); inode = NULL; goto out2; } e->dentry = dget(dentry); |
8e18e2941 [PATCH] inode_die... |
716 |
inode->i_private = e; |
1da177e4c Linux-2.6.12-rc2 |
717 718 719 720 721 722 723 724 725 726 727 |
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: |
1b1dcc1b5 [PATCH] mutex sub... |
728 |
mutex_unlock(&root->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
729 730 731 732 733 734 735 736 |
dput(root); if (err) { kfree(e); return -EINVAL; } return count; } |
4b6f5d20b [PATCH] Make most... |
737 |
static const struct file_operations bm_register_operations = { |
1da177e4c Linux-2.6.12-rc2 |
738 |
.write = bm_register_write, |
6038f373a llseek: automatic... |
739 |
.llseek = noop_llseek, |
1da177e4c Linux-2.6.12-rc2 |
740 741 742 743 744 745 746 |
}; /* /status */ static ssize_t bm_status_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) { |
87113e806 fs/binfmt_misc.c:... |
747 748 749 |
char *s = enabled ? "enabled " : "disabled "; |
1da177e4c Linux-2.6.12-rc2 |
750 |
|
92f4c701a use simple_read_f... |
751 |
return simple_read_from_buffer(buf, nbytes, ppos, s, strlen(s)); |
1da177e4c Linux-2.6.12-rc2 |
752 |
} |
e6084d4a0 binfmt_misc: clea... |
753 |
static ssize_t bm_status_write(struct file *file, const char __user *buffer, |
1da177e4c Linux-2.6.12-rc2 |
754 755 756 757 758 759 |
size_t count, loff_t *ppos) { int res = parse_command(buffer, count); struct dentry *root; switch (res) { |
e6084d4a0 binfmt_misc: clea... |
760 761 762 763 764 765 766 767 768 769 770 771 |
case 1: /* Disable all handlers. */ enabled = 0; break; case 2: /* Enable all handlers. */ enabled = 1; break; case 3: /* Delete all handlers. */ root = dget(file->f_path.dentry->d_sb->s_root); mutex_lock(&root->d_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
772 |
|
e6084d4a0 binfmt_misc: clea... |
773 774 |
while (!list_empty(&entries)) kill_node(list_entry(entries.next, Node, list)); |
1da177e4c Linux-2.6.12-rc2 |
775 |
|
e6084d4a0 binfmt_misc: clea... |
776 777 778 779 780 |
mutex_unlock(&root->d_inode->i_mutex); dput(root); break; default: return res; |
1da177e4c Linux-2.6.12-rc2 |
781 |
} |
e6084d4a0 binfmt_misc: clea... |
782 |
|
1da177e4c Linux-2.6.12-rc2 |
783 784 |
return count; } |
4b6f5d20b [PATCH] Make most... |
785 |
static const struct file_operations bm_status_operations = { |
1da177e4c Linux-2.6.12-rc2 |
786 787 |
.read = bm_status_read, .write = bm_status_write, |
6038f373a llseek: automatic... |
788 |
.llseek = default_llseek, |
1da177e4c Linux-2.6.12-rc2 |
789 790 791 |
}; /* Superblock handling */ |
ee9b6d61a [PATCH] Mark stru... |
792 |
static const struct super_operations s_ops = { |
1da177e4c Linux-2.6.12-rc2 |
793 |
.statfs = simple_statfs, |
b57922d97 convert remaining... |
794 |
.evict_inode = bm_evict_inode, |
1da177e4c Linux-2.6.12-rc2 |
795 |
}; |
e6084d4a0 binfmt_misc: clea... |
796 |
static int bm_fill_super(struct super_block *sb, void *data, int silent) |
1da177e4c Linux-2.6.12-rc2 |
797 |
{ |
e6084d4a0 binfmt_misc: clea... |
798 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
799 |
static struct tree_descr bm_files[] = { |
1a1c9bb43 inode numbering: ... |
800 801 |
[2] = {"status", &bm_status_operations, S_IWUSR|S_IRUGO}, [3] = {"register", &bm_register_operations, S_IWUSR}, |
1da177e4c Linux-2.6.12-rc2 |
802 803 |
/* last one */ {""} }; |
e6084d4a0 binfmt_misc: clea... |
804 805 |
err = simple_fill_super(sb, BINFMTFS_MAGIC, bm_files); |
1da177e4c Linux-2.6.12-rc2 |
806 807 808 809 |
if (!err) sb->s_op = &s_ops; return err; } |
fc14f2fef convert get_sb_si... |
810 811 |
static struct dentry *bm_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) |
1da177e4c Linux-2.6.12-rc2 |
812 |
{ |
fc14f2fef convert get_sb_si... |
813 |
return mount_single(fs_type, flags, data, bm_fill_super); |
1da177e4c Linux-2.6.12-rc2 |
814 815 816 817 818 819 820 821 822 823 |
} 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", |
fc14f2fef convert get_sb_si... |
824 |
.mount = bm_mount, |
1da177e4c Linux-2.6.12-rc2 |
825 826 |
.kill_sb = kill_litter_super, }; |
7f78e0351 fs: Limit sys_mou... |
827 |
MODULE_ALIAS_FS("binfmt_misc"); |
1da177e4c Linux-2.6.12-rc2 |
828 829 830 831 |
static int __init init_misc_binfmt(void) { int err = register_filesystem(&bm_fs_type); |
8fc3dc5a3 __register_binfmt... |
832 833 |
if (!err) insert_binfmt(&misc_format); |
1da177e4c Linux-2.6.12-rc2 |
834 835 836 837 838 839 840 841 842 843 844 845 |
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"); |