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binfmt_misc: clean up code style a bit
Clean up various coding style issues that checkpatch complains about. No functional changes here. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Frysinger
Linus Torvalds
parent
6b899c4e9a
commit
e6084d4a08
1 changed files with 145 additions and 148 deletions
293
fs/binfmt_misc.c
293
fs/binfmt_misc.c
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@ -1,19 +1,10 @@
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/*
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* binfmt_misc.c
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* binfmt_misc.c
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*
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* Copyright (C) 1997 Richard Günther
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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
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* a specified wrapper. This should obsolete binfmt_java, binfmt_em86 and
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* binfmt_mz.
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*
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* 1997-04-25 first version
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* [...]
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* 1997-05-19 cleanup
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* 1997-06-26 hpa: pass the real filename rather than argv[0]
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* 1997-06-30 minor cleanup
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* 1997-08-09 removed extension stripping, locking cleanup
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* 2001-02-28 AV: rewritten into something that resembles C. Original didn't.
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* binfmt_misc detects binaries via a magic or filename extension and invokes
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* 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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@ -48,9 +39,9 @@ static LIST_HEAD(entries);
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static int enabled = 1;
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enum {Enabled, Magic};
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#define MISC_FMT_PRESERVE_ARGV0 (1<<31)
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#define MISC_FMT_OPEN_BINARY (1<<30)
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#define MISC_FMT_CREDENTIALS (1<<29)
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#define MISC_FMT_PRESERVE_ARGV0 (1 << 31)
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#define MISC_FMT_OPEN_BINARY (1 << 30)
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#define MISC_FMT_CREDENTIALS (1 << 29)
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typedef struct {
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struct list_head list;
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@ -134,7 +125,7 @@ static Node *check_file(struct linux_binprm *bprm)
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static int load_misc_binary(struct linux_binprm *bprm)
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{
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Node *fmt;
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struct file * interp_file = NULL;
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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;
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@ -142,7 +133,7 @@ static int load_misc_binary(struct linux_binprm *bprm)
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retval = -ENOEXEC;
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if (!enabled)
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goto _ret;
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goto ret;
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/* to keep locking time low, we copy the interpreter string */
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read_lock(&entries_lock);
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@ -151,25 +142,26 @@ static int load_misc_binary(struct linux_binprm *bprm)
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strlcpy(iname, fmt->interpreter, BINPRM_BUF_SIZE);
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read_unlock(&entries_lock);
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if (!fmt)
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goto _ret;
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goto ret;
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if (!(fmt->flags & MISC_FMT_PRESERVE_ARGV0)) {
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retval = remove_arg_zero(bprm);
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if (retval)
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goto _ret;
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goto ret;
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}
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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
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* interpreter than keep it open and assign descriptor
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* to it */
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* to it
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*/
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fd_binary = get_unused_fd_flags(0);
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if (fd_binary < 0) {
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retval = fd_binary;
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goto _ret;
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}
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fd_install(fd_binary, bprm->file);
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if (fd_binary < 0) {
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retval = fd_binary;
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goto ret;
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}
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fd_install(fd_binary, bprm->file);
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/* if the binary is not readable than enforce mm->dumpable=0
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regardless of the interpreter's permissions */
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@ -182,32 +174,32 @@ static int load_misc_binary(struct linux_binprm *bprm)
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bprm->interp_flags |= BINPRM_FLAGS_EXECFD;
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bprm->interp_data = fd_binary;
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} else {
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allow_write_access(bprm->file);
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fput(bprm->file);
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bprm->file = NULL;
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}
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} else {
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allow_write_access(bprm->file);
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fput(bprm->file);
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bprm->file = NULL;
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}
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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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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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goto error;
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bprm->argc++;
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/* add the interp as argv[0] */
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retval = copy_strings_kernel (1, &iname_addr, bprm);
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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;
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bprm->argc ++;
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goto error;
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bprm->argc++;
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/* Update interp in case binfmt_script needs it. */
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retval = bprm_change_interp(iname, bprm);
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if (retval < 0)
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goto _error;
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goto error;
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interp_file = open_exec (iname);
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retval = PTR_ERR (interp_file);
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if (IS_ERR (interp_file))
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goto _error;
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interp_file = open_exec(iname);
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retval = PTR_ERR(interp_file);
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if (IS_ERR(interp_file))
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goto error;
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bprm->file = interp_file;
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if (fmt->flags & MISC_FMT_CREDENTIALS) {
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@ -218,23 +210,23 @@ static int load_misc_binary(struct linux_binprm *bprm)
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memset(bprm->buf, 0, BINPRM_BUF_SIZE);
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retval = kernel_read(bprm->file, 0, bprm->buf, BINPRM_BUF_SIZE);
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} else
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retval = prepare_binprm (bprm);
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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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goto error;
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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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goto error;
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_ret:
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ret:
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return retval;
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_error:
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error:
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if (fd_binary > 0)
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sys_close(fd_binary);
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bprm->interp_flags = 0;
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bprm->interp_data = 0;
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goto _ret;
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goto ret;
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}
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/* Command parsers */
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@ -261,39 +253,40 @@ static char *scanarg(char *s, char del)
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return s;
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}
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static char * check_special_flags (char * sfs, Node * e)
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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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char *p = sfs;
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int cont = 1;
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/* special flags */
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while (cont) {
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switch (*p) {
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case 'P':
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pr_debug("register: flag: P (preserve argv0)\n");
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p++;
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e->flags |= MISC_FMT_PRESERVE_ARGV0;
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break;
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case 'O':
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pr_debug("register: flag: O (open binary)\n");
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p++;
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e->flags |= MISC_FMT_OPEN_BINARY;
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break;
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case 'C':
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pr_debug("register: flag: C (preserve creds)\n");
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p++;
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/* this flags also implies the
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open-binary flag */
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e->flags |= (MISC_FMT_CREDENTIALS |
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MISC_FMT_OPEN_BINARY);
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break;
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default:
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cont = 0;
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case 'P':
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pr_debug("register: flag: P (preserve argv0)\n");
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p++;
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e->flags |= MISC_FMT_PRESERVE_ARGV0;
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break;
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case 'O':
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pr_debug("register: flag: O (open binary)\n");
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p++;
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e->flags |= MISC_FMT_OPEN_BINARY;
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break;
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case 'C':
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pr_debug("register: flag: C (preserve creds)\n");
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p++;
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/* this flags also implies the
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open-binary flag */
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e->flags |= (MISC_FMT_CREDENTIALS |
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MISC_FMT_OPEN_BINARY);
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break;
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default:
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cont = 0;
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}
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}
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return p;
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}
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/*
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* This registers a new binary format, it recognises the syntax
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* ':name:type:offset:magic:mask:interpreter:flags'
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@ -323,26 +316,26 @@ static Node *create_entry(const char __user *buffer, size_t count)
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memset(e, 0, sizeof(Node));
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if (copy_from_user(buf, buffer, count))
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goto Efault;
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goto efault;
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del = *p++; /* delimeter */
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pr_debug("register: delim: %#x {%c}\n", del, del);
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/* Pad the buffer with the delim to simplify parsing below. */
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memset(buf+count, del, 8);
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memset(buf + count, del, 8);
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/* Parse the 'name' field. */
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e->name = p;
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p = strchr(p, del);
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if (!p)
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goto Einval;
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goto einval;
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*p++ = '\0';
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if (!e->name[0] ||
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!strcmp(e->name, ".") ||
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!strcmp(e->name, "..") ||
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strchr(e->name, '/'))
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goto Einval;
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goto einval;
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pr_debug("register: name: {%s}\n", e->name);
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@ -357,10 +350,10 @@ static Node *create_entry(const char __user *buffer, size_t count)
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e->flags = (1 << Enabled) | (1 << Magic);
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break;
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default:
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goto Einval;
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goto einval;
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}
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if (*p++ != del)
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goto Einval;
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goto einval;
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if (test_bit(Magic, &e->flags)) {
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/* Handle the 'M' (magic) format. */
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@ -369,21 +362,21 @@ static Node *create_entry(const char __user *buffer, size_t count)
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/* Parse the 'offset' field. */
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s = strchr(p, del);
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if (!s)
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goto Einval;
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goto einval;
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*s++ = '\0';
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e->offset = simple_strtoul(p, &p, 10);
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if (*p++)
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goto Einval;
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goto einval;
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pr_debug("register: offset: %#x\n", e->offset);
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/* Parse the 'magic' field. */
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e->magic = p;
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p = scanarg(p, del);
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if (!p)
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goto Einval;
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goto einval;
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p[-1] = '\0';
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if (p == e->magic)
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goto Einval;
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goto einval;
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if (USE_DEBUG)
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print_hex_dump_bytes(
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KBUILD_MODNAME ": register: magic[raw]: ",
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@ -393,7 +386,7 @@ static Node *create_entry(const char __user *buffer, size_t count)
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e->mask = p;
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p = scanarg(p, del);
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if (!p)
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goto Einval;
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goto einval;
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p[-1] = '\0';
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if (p == e->mask) {
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e->mask = NULL;
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@ -412,9 +405,9 @@ static Node *create_entry(const char __user *buffer, size_t count)
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e->size = string_unescape_inplace(e->magic, UNESCAPE_HEX);
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if (e->mask &&
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string_unescape_inplace(e->mask, UNESCAPE_HEX) != e->size)
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goto Einval;
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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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goto einval;
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pr_debug("register: magic/mask length: %i\n", e->size);
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if (USE_DEBUG) {
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print_hex_dump_bytes(
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@ -446,23 +439,23 @@ static Node *create_entry(const char __user *buffer, size_t count)
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/* Skip the 'offset' field. */
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p = strchr(p, del);
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if (!p)
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goto Einval;
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goto einval;
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*p++ = '\0';
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/* Parse the 'magic' field. */
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e->magic = p;
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p = strchr(p, del);
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if (!p)
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goto Einval;
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goto einval;
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*p++ = '\0';
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if (!e->magic[0] || strchr(e->magic, '/'))
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goto Einval;
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goto einval;
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pr_debug("register: extension: {%s}\n", e->magic);
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|
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/* Skip the 'mask' field. */
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p = strchr(p, del);
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if (!p)
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goto Einval;
|
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goto einval;
|
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*p++ = '\0';
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}
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|
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|
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@ -470,27 +463,28 @@ static Node *create_entry(const char __user *buffer, size_t count)
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e->interpreter = p;
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p = strchr(p, del);
|
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if (!p)
|
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goto Einval;
|
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goto einval;
|
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*p++ = '\0';
|
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if (!e->interpreter[0])
|
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goto Einval;
|
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goto einval;
|
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pr_debug("register: interpreter: {%s}\n", e->interpreter);
|
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|
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/* Parse the 'flags' field. */
|
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p = check_special_flags (p, e);
|
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p = check_special_flags(p, e);
|
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if (*p == '\n')
|
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p++;
|
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if (p != buf + count)
|
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goto Einval;
|
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goto einval;
|
||||
|
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return e;
|
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|
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out:
|
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return ERR_PTR(err);
|
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|
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Efault:
|
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efault:
|
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kfree(e);
|
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return ERR_PTR(-EFAULT);
|
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Einval:
|
||||
einval:
|
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kfree(e);
|
||||
return ERR_PTR(-EINVAL);
|
||||
}
|
||||
|
|
@ -509,7 +503,7 @@ static int parse_command(const char __user *buffer, size_t count)
|
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return -EFAULT;
|
||||
if (!count)
|
||||
return 0;
|
||||
if (s[count-1] == '\n')
|
||||
if (s[count - 1] == '\n')
|
||||
count--;
|
||||
if (count == 1 && s[0] == '0')
|
||||
return 1;
|
||||
|
|
@ -526,7 +520,7 @@ static void entry_status(Node *e, char *page)
|
|||
{
|
||||
char *dp;
|
||||
char *status = "disabled";
|
||||
const char * flags = "flags: ";
|
||||
const char *flags = "flags: ";
|
||||
|
||||
if (test_bit(Enabled, &e->flags))
|
||||
status = "enabled";
|
||||
|
|
@ -540,19 +534,15 @@ static void entry_status(Node *e, char *page)
|
|||
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';
|
||||
|
||||
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);
|
||||
|
|
@ -580,7 +570,7 @@ static void entry_status(Node *e, char *page)
|
|||
|
||||
static struct inode *bm_get_inode(struct super_block *sb, int mode)
|
||||
{
|
||||
struct inode * inode = new_inode(sb);
|
||||
struct inode *inode = new_inode(sb);
|
||||
|
||||
if (inode) {
|
||||
inode->i_ino = get_next_ino();
|
||||
|
|
@ -620,13 +610,14 @@ static void kill_node(Node *e)
|
|||
/* /<entry> */
|
||||
|
||||
static ssize_t
|
||||
bm_entry_read(struct file * file, char __user * buf, size_t nbytes, loff_t *ppos)
|
||||
bm_entry_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
|
||||
{
|
||||
Node *e = file_inode(file)->i_private;
|
||||
ssize_t res;
|
||||
char *page;
|
||||
|
||||
if (!(page = (char*) __get_free_page(GFP_KERNEL)))
|
||||
page = (char *) __get_free_page(GFP_KERNEL);
|
||||
if (!page)
|
||||
return -ENOMEM;
|
||||
|
||||
entry_status(e, page);
|
||||
|
|
@ -645,26 +636,28 @@ static ssize_t bm_entry_write(struct file *file, const char __user *buffer,
|
|||
int res = parse_command(buffer, count);
|
||||
|
||||
switch (res) {
|
||||
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);
|
||||
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);
|
||||
|
||||
kill_node(e);
|
||||
kill_node(e);
|
||||
|
||||
mutex_unlock(&root->d_inode->i_mutex);
|
||||
dput(root);
|
||||
break;
|
||||
default: return res;
|
||||
mutex_unlock(&root->d_inode->i_mutex);
|
||||
dput(root);
|
||||
break;
|
||||
default:
|
||||
return res;
|
||||
}
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
|
|
@ -752,34 +745,36 @@ bm_status_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
|
|||
return simple_read_from_buffer(buf, nbytes, ppos, s, strlen(s));
|
||||
}
|
||||
|
||||
static ssize_t bm_status_write(struct file * file, const char __user * buffer,
|
||||
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:
|
||||
/* 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);
|
||||
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);
|
||||
|
||||
while (!list_empty(&entries))
|
||||
kill_node(list_entry(entries.next, Node, list));
|
||||
while (!list_empty(&entries))
|
||||
kill_node(list_entry(entries.next, Node, list));
|
||||
|
||||
mutex_unlock(&root->d_inode->i_mutex);
|
||||
dput(root);
|
||||
break;
|
||||
default: return res;
|
||||
mutex_unlock(&root->d_inode->i_mutex);
|
||||
dput(root);
|
||||
break;
|
||||
default:
|
||||
return res;
|
||||
}
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
|
|
@ -796,14 +791,16 @@ static const struct super_operations s_ops = {
|
|||
.evict_inode = bm_evict_inode,
|
||||
};
|
||||
|
||||
static int bm_fill_super(struct super_block * sb, void * data, int silent)
|
||||
static int bm_fill_super(struct super_block *sb, void *data, int silent)
|
||||
{
|
||||
int err;
|
||||
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);
|
||||
|
||||
err = simple_fill_super(sb, BINFMTFS_MAGIC, bm_files);
|
||||
if (!err)
|
||||
sb->s_op = &s_ops;
|
||||
return err;
|
||||
|
|
|
|||
Loading…
Reference in a new issue