diff options
author | 2014-12-10 15:52:10 -0800 | |
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committer | 2014-12-10 17:41:12 -0800 | |
commit | e6084d4a086b626acb5cf97795a9243062c2f4cd (patch) | |
tree | 5ed1c13b36f05bfe89948876a847ab05017865b3 | |
parent | binfmt_misc: add comments & debug logs (diff) | |
download | linux-e6084d4.tar.gz linux-e6084d4.tar.bz2 linux-e6084d4.zip |
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>
-rw-r--r-- | fs/binfmt_misc.c | 293 |
1 files changed, 145 insertions, 148 deletions
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c index d87ddc7c4b14..01a2cd9ab2bf 100644 --- a/fs/binfmt_misc.c +++ b/fs/binfmt_misc.c @@ -1,19 +1,10 @@ /* - * binfmt_misc.c + * binfmt_misc.c * - * Copyright (C) 1997 Richard Günther + * 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. + * binfmt_misc detects binaries via a magic or filename extension and invokes + * a specified wrapper. See Documentation/binfmt_misc.txt for more details. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt @@ -48,9 +39,9 @@ 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) +#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; @@ -134,7 +125,7 @@ static Node *check_file(struct linux_binprm *bprm) static int load_misc_binary(struct linux_binprm *bprm) { Node *fmt; - struct file * interp_file = NULL; + struct file *interp_file = NULL; char iname[BINPRM_BUF_SIZE]; const char *iname_addr = iname; int retval; @@ -142,7 +133,7 @@ static int load_misc_binary(struct linux_binprm *bprm) retval = -ENOEXEC; if (!enabled) - goto _ret; + goto ret; /* to keep locking time low, we copy the interpreter string */ read_lock(&entries_lock); @@ -151,25 +142,26 @@ static int load_misc_binary(struct linux_binprm *bprm) strlcpy(iname, fmt->interpreter, BINPRM_BUF_SIZE); read_unlock(&entries_lock); if (!fmt) - goto _ret; + goto ret; if (!(fmt->flags & MISC_FMT_PRESERVE_ARGV0)) { retval = remove_arg_zero(bprm); if (retval) - goto _ret; + 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 */ + * to it + */ fd_binary = get_unused_fd_flags(0); - if (fd_binary < 0) { - retval = fd_binary; - goto _ret; - } - fd_install(fd_binary, bprm->file); + 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 */ @@ -182,32 +174,32 @@ static int load_misc_binary(struct linux_binprm *bprm) bprm->interp_flags |= BINPRM_FLAGS_EXECFD; bprm->interp_data = fd_binary; - } else { - allow_write_access(bprm->file); - fput(bprm->file); - bprm->file = NULL; - } + } 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); + retval = copy_strings_kernel(1, &bprm->interp, bprm); if (retval < 0) - goto _error; + goto error; bprm->argc++; /* add the interp as argv[0] */ - retval = copy_strings_kernel (1, &iname_addr, bprm); + retval = copy_strings_kernel(1, &iname_addr, bprm); if (retval < 0) - goto _error; - bprm->argc ++; + goto error; + bprm->argc++; /* Update interp in case binfmt_script needs it. */ retval = bprm_change_interp(iname, bprm); if (retval < 0) - goto _error; + goto error; - interp_file = open_exec (iname); - retval = PTR_ERR (interp_file); - if (IS_ERR (interp_file)) - goto _error; + 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) { @@ -218,23 +210,23 @@ static int load_misc_binary(struct linux_binprm *bprm) memset(bprm->buf, 0, BINPRM_BUF_SIZE); retval = kernel_read(bprm->file, 0, bprm->buf, BINPRM_BUF_SIZE); } else - retval = prepare_binprm (bprm); + retval = prepare_binprm(bprm); if (retval < 0) - goto _error; + goto error; retval = search_binary_handler(bprm); if (retval < 0) - goto _error; + goto error; -_ret: +ret: return retval; -_error: +error: if (fd_binary > 0) sys_close(fd_binary); bprm->interp_flags = 0; bprm->interp_data = 0; - goto _ret; + goto ret; } /* Command parsers */ @@ -261,39 +253,40 @@ static char *scanarg(char *s, char del) return s; } -static char * check_special_flags (char * sfs, Node * e) +static char *check_special_flags(char *sfs, Node *e) { - char * p = sfs; + char *p = sfs; int cont = 1; /* special flags */ while (cont) { switch (*p) { - case 'P': - pr_debug("register: flag: P (preserve argv0)\n"); - p++; - e->flags |= MISC_FMT_PRESERVE_ARGV0; - break; - case 'O': - pr_debug("register: flag: O (open binary)\n"); - p++; - e->flags |= MISC_FMT_OPEN_BINARY; - break; - case 'C': - pr_debug("register: flag: C (preserve creds)\n"); - p++; - /* this flags also implies the - open-binary flag */ - e->flags |= (MISC_FMT_CREDENTIALS | - MISC_FMT_OPEN_BINARY); - break; - default: - cont = 0; + case 'P': + pr_debug("register: flag: P (preserve argv0)\n"); + p++; + e->flags |= MISC_FMT_PRESERVE_ARGV0; + break; + case 'O': + pr_debug("register: flag: O (open binary)\n"); + p++; + e->flags |= MISC_FMT_OPEN_BINARY; + break; + case 'C': + pr_debug("register: flag: C (preserve creds)\n"); + 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' @@ -323,26 +316,26 @@ static Node *create_entry(const char __user *buffer, size_t count) memset(e, 0, sizeof(Node)); if (copy_from_user(buf, buffer, count)) - goto Efault; + goto efault; del = *p++; /* delimeter */ pr_debug("register: delim: %#x {%c}\n", del, del); /* Pad the buffer with the delim to simplify parsing below. */ - memset(buf+count, del, 8); + memset(buf + count, del, 8); /* Parse the 'name' field. */ e->name = p; p = strchr(p, del); if (!p) - goto Einval; + goto einval; *p++ = '\0'; if (!e->name[0] || !strcmp(e->name, ".") || !strcmp(e->name, "..") || strchr(e->name, '/')) - goto Einval; + goto einval; pr_debug("register: name: {%s}\n", e->name); @@ -357,10 +350,10 @@ static Node *create_entry(const char __user *buffer, size_t count) e->flags = (1 << Enabled) | (1 << Magic); break; default: - goto Einval; + goto einval; } if (*p++ != del) - goto Einval; + goto einval; if (test_bit(Magic, &e->flags)) { /* Handle the 'M' (magic) format. */ @@ -369,21 +362,21 @@ static Node *create_entry(const char __user *buffer, size_t count) /* Parse the 'offset' field. */ s = strchr(p, del); if (!s) - goto Einval; + goto einval; *s++ = '\0'; e->offset = simple_strtoul(p, &p, 10); if (*p++) - goto Einval; + goto einval; pr_debug("register: offset: %#x\n", e->offset); /* Parse the 'magic' field. */ e->magic = p; p = scanarg(p, del); if (!p) - goto Einval; + goto einval; p[-1] = '\0'; if (p == e->magic) - goto Einval; + goto einval; if (USE_DEBUG) print_hex_dump_bytes( KBUILD_MODNAME ": register: magic[raw]: ", @@ -393,7 +386,7 @@ static Node *create_entry(const char __user *buffer, size_t count) e->mask = p; p = scanarg(p, del); if (!p) - goto Einval; + goto einval; p[-1] = '\0'; if (p == e->mask) { e->mask = NULL; @@ -412,9 +405,9 @@ static Node *create_entry(const char __user *buffer, size_t count) e->size = string_unescape_inplace(e->magic, UNESCAPE_HEX); if (e->mask && string_unescape_inplace(e->mask, UNESCAPE_HEX) != e->size) - goto Einval; + goto einval; if (e->size + e->offset > BINPRM_BUF_SIZE) - goto Einval; + goto einval; pr_debug("register: magic/mask length: %i\n", e->size); if (USE_DEBUG) { print_hex_dump_bytes( @@ -446,23 +439,23 @@ static Node *create_entry(const char __user *buffer, size_t count) /* Skip the 'offset' field. */ p = strchr(p, del); if (!p) - goto Einval; + goto einval; *p++ = '\0'; /* Parse the 'magic' field. */ e->magic = p; p = strchr(p, del); if (!p) - goto Einval; + goto einval; *p++ = '\0'; if (!e->magic[0] || strchr(e->magic, '/')) - goto Einval; + goto einval; pr_debug("register: extension: {%s}\n", e->magic); /* Skip the 'mask' field. */ p = strchr(p, del); if (!p) - goto Einval; + goto einval; *p++ = '\0'; } @@ -470,27 +463,28 @@ static Node *create_entry(const char __user *buffer, size_t count) e->interpreter = p; p = strchr(p, del); if (!p) - goto Einval; + goto einval; *p++ = '\0'; if (!e->interpreter[0]) - goto Einval; + goto einval; pr_debug("register: interpreter: {%s}\n", e->interpreter); /* Parse the 'flags' field. */ - p = check_special_flags (p, e); + p = check_special_flags(p, e); if (*p == '\n') p++; if (p != buf + count) - goto Einval; + goto einval; + return e; out: return ERR_PTR(err); -Efault: +efault: kfree(e); return ERR_PTR(-EFAULT); -Einval: +einval: kfree(e); return ERR_PTR(-EINVAL); } @@ -509,7 +503,7 @@ static int parse_command(const char __user *buffer, size_t count) 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; |