diff options
| -rw-r--r-- | security/tomoyo/common.h | 48 | ||||
| -rw-r--r-- | security/tomoyo/domain.c | 72 | ||||
| -rw-r--r-- | security/tomoyo/file.c | 136 | ||||
| -rw-r--r-- | security/tomoyo/memory.c | 1 | ||||
| -rw-r--r-- | security/tomoyo/mount.c | 55 | ||||
| -rw-r--r-- | security/tomoyo/realpath.c | 214 |
6 files changed, 208 insertions, 318 deletions
diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h index 6270a530c4d..f4a8aa244af 100644 --- a/security/tomoyo/common.h +++ b/security/tomoyo/common.h @@ -33,14 +33,7 @@ struct linux_binprm; #define TOMOYO_HASH_BITS 8 #define TOMOYO_MAX_HASH (1u<<TOMOYO_HASH_BITS) -/* - * This is the max length of a token. - * - * A token consists of only ASCII printable characters. - * Non printable characters in a token is represented in \ooo style - * octal string. Thus, \ itself is represented as \\. - */ -#define TOMOYO_MAX_PATHNAME_LEN 4000 +#define TOMOYO_EXEC_TMPSIZE 4096 /* Profile number is an integer between 0 and 255. */ #define TOMOYO_MAX_PROFILES 256 @@ -168,17 +161,6 @@ enum tomoyo_securityfs_interface_index { /********** Structure definitions. **********/ /* - * tomoyo_page_buffer is a structure which is used for holding a pathname - * obtained from "struct dentry" and "struct vfsmount" pair. - * As of now, it is 4096 bytes. If users complain that 4096 bytes is too small - * (because TOMOYO escapes non ASCII printable characters using \ooo format), - * we will make the buffer larger. - */ -struct tomoyo_page_buffer { - char buffer[4096]; -}; - -/* * tomoyo_request_info is a structure which is used for holding * * (1) Domain information of current process. @@ -231,28 +213,6 @@ struct tomoyo_name_entry { struct tomoyo_path_info entry; }; -/* - * tomoyo_path_info_with_data is a structure which is used for holding a - * pathname obtained from "struct dentry" and "struct vfsmount" pair. - * - * "struct tomoyo_path_info_with_data" consists of "struct tomoyo_path_info" - * and buffer for the pathname, while "struct tomoyo_page_buffer" consists of - * buffer for the pathname only. - * - * "struct tomoyo_path_info_with_data" is intended to allow TOMOYO to release - * both "struct tomoyo_path_info" and buffer for the pathname by single kfree() - * so that we don't need to return two pointers to the caller. If the caller - * puts "struct tomoyo_path_info" on stack memory, we will be able to remove - * "struct tomoyo_path_info_with_data". - */ -struct tomoyo_path_info_with_data { - /* Keep "head" first, for this pointer is passed to kfree(). */ - struct tomoyo_path_info head; - char barrier1[16]; /* Safeguard for overrun. */ - char body[TOMOYO_MAX_PATHNAME_LEN]; - char barrier2[16]; /* Safeguard for overrun. */ -}; - struct tomoyo_name_union { const struct tomoyo_path_info *filename; struct tomoyo_path_group *group; @@ -827,11 +787,7 @@ void tomoyo_load_policy(const char *filename); void tomoyo_put_number_union(struct tomoyo_number_union *ptr); /* Convert binary string to ascii string. */ -int tomoyo_encode(char *buffer, int buflen, const char *str); - -/* Returns realpath(3) of the given pathname but ignores chroot'ed root. */ -int tomoyo_realpath_from_path2(struct path *path, char *newname, - int newname_len); +char *tomoyo_encode(const char *str); /* * Returns realpath(3) of the given pathname but ignores chroot'ed root. diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c index 08428bc082d..7b8693e29a1 100644 --- a/security/tomoyo/domain.c +++ b/security/tomoyo/domain.c @@ -676,47 +676,43 @@ struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char * int tomoyo_find_next_domain(struct linux_binprm *bprm) { struct tomoyo_request_info r; - /* - * This function assumes that the size of buffer returned by - * tomoyo_realpath() = TOMOYO_MAX_PATHNAME_LEN. - */ - struct tomoyo_page_buffer *tmp = kzalloc(sizeof(*tmp), GFP_NOFS); + char *tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); struct tomoyo_domain_info *old_domain = tomoyo_domain(); struct tomoyo_domain_info *domain = NULL; const char *old_domain_name = old_domain->domainname->name; const char *original_name = bprm->filename; - char *new_domain_name = NULL; - char *real_program_name = NULL; - char *symlink_program_name = NULL; const u8 mode = tomoyo_check_flags(old_domain, TOMOYO_MAC_FOR_FILE); const bool is_enforce = (mode == TOMOYO_CONFIG_ENFORCING); int retval = -ENOMEM; - struct tomoyo_path_info rn; /* real name */ - struct tomoyo_path_info sn; /* symlink name */ + bool need_kfree = false; + struct tomoyo_path_info rn = { }; /* real name */ + struct tomoyo_path_info sn = { }; /* symlink name */ struct tomoyo_path_info ln; /* last name */ + ln.name = tomoyo_get_last_name(old_domain); + tomoyo_fill_path_info(&ln); tomoyo_init_request_info(&r, NULL); if (!tmp) goto out; retry: + if (need_kfree) { + kfree(rn.name); + need_kfree = false; + } /* Get tomoyo_realpath of program. */ retval = -ENOENT; - /* I hope tomoyo_realpath() won't fail with -ENOMEM. */ - real_program_name = tomoyo_realpath(original_name); - if (!real_program_name) + rn.name = tomoyo_realpath(original_name); + if (!rn.name) goto out; + tomoyo_fill_path_info(&rn); + need_kfree = true; + /* Get tomoyo_realpath of symbolic link. */ - symlink_program_name = tomoyo_realpath_nofollow(original_name); - if (!symlink_program_name) + sn.name = tomoyo_realpath_nofollow(original_name); + if (!sn.name) goto out; - - rn.name = real_program_name; - tomoyo_fill_path_info(&rn); - sn.name = symlink_program_name; tomoyo_fill_path_info(&sn); - ln.name = tomoyo_get_last_name(old_domain); - tomoyo_fill_path_info(&ln); /* Check 'alias' directive. */ if (tomoyo_pathcmp(&rn, &sn)) { @@ -727,10 +723,10 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm) tomoyo_pathcmp(&rn, ptr->original_name) || tomoyo_pathcmp(&sn, ptr->aliased_name)) continue; - memset(real_program_name, 0, TOMOYO_MAX_PATHNAME_LEN); - strncpy(real_program_name, ptr->aliased_name->name, - TOMOYO_MAX_PATHNAME_LEN - 1); - tomoyo_fill_path_info(&rn); + kfree(rn.name); + need_kfree = false; + /* This is OK because it is read only. */ + rn = *ptr->aliased_name; break; } } @@ -742,11 +738,10 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm) if (retval < 0) goto out; - new_domain_name = tmp->buffer; if (tomoyo_is_domain_initializer(old_domain->domainname, &rn, &ln)) { /* Transit to the child of tomoyo_kernel_domain domain. */ - snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1, - TOMOYO_ROOT_NAME " " "%s", real_program_name); + snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, + TOMOYO_ROOT_NAME " " "%s", rn.name); } else if (old_domain == &tomoyo_kernel_domain && !tomoyo_policy_loaded) { /* @@ -760,29 +755,27 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm) domain = old_domain; } else { /* Normal domain transition. */ - snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1, - "%s %s", old_domain_name, real_program_name); + snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, + "%s %s", old_domain_name, rn.name); } - if (domain || strlen(new_domain_name) >= TOMOYO_MAX_PATHNAME_LEN) + if (domain || strlen(tmp) >= TOMOYO_EXEC_TMPSIZE - 10) goto done; - domain = tomoyo_find_domain(new_domain_name); + domain = tomoyo_find_domain(tmp); if (domain) goto done; if (is_enforce) { int error = tomoyo_supervisor(&r, "# wants to create domain\n" - "%s\n", new_domain_name); + "%s\n", tmp); if (error == TOMOYO_RETRY_REQUEST) goto retry; if (error < 0) goto done; } - domain = tomoyo_find_or_assign_new_domain(new_domain_name, - old_domain->profile); + domain = tomoyo_find_or_assign_new_domain(tmp, old_domain->profile); done: if (domain) goto out; - printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", - new_domain_name); + printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", tmp); if (is_enforce) retval = -EPERM; else @@ -793,8 +786,9 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm) /* Update reference count on "struct tomoyo_domain_info". */ atomic_inc(&domain->users); bprm->cred->security = domain; - kfree(real_program_name); - kfree(symlink_program_name); + if (need_kfree) + kfree(rn.name); + kfree(sn.name); kfree(tmp); return retval; } diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c index c13806937dc..cef685415df 100644 --- a/security/tomoyo/file.c +++ b/security/tomoyo/file.c @@ -148,6 +148,17 @@ const char *tomoyo_path_number2keyword(const u8 operation) ? tomoyo_path_number_keyword[operation] : NULL; } +static void tomoyo_add_slash(struct tomoyo_path_info *buf) +{ + if (buf->is_dir) + return; + /* + * This is OK because tomoyo_encode() reserves space for appending "/". + */ + strcat((char *) buf->name, "/"); + tomoyo_fill_path_info(buf); +} + /** * tomoyo_strendswith - Check whether the token ends with the given token. * @@ -167,30 +178,21 @@ static bool tomoyo_strendswith(const char *name, const char *tail) } /** - * tomoyo_get_path - Get realpath. + * tomoyo_get_realpath - Get realpath. * + * @buf: Pointer to "struct tomoyo_path_info". * @path: Pointer to "struct path". * - * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise. + * Returns true on success, false otherwise. */ -static struct tomoyo_path_info *tomoyo_get_path(struct path *path) +static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, struct path *path) { - int error; - struct tomoyo_path_info_with_data *buf = kzalloc(sizeof(*buf), - GFP_NOFS); - - if (!buf) - return NULL; - /* Reserve one byte for appending "/". */ - error = tomoyo_realpath_from_path2(path, buf->body, - sizeof(buf->body) - 2); - if (!error) { - buf->head.name = buf->body; - tomoyo_fill_path_info(&buf->head); - return &buf->head; + buf->name = tomoyo_realpath_from_path(path); + if (buf->name) { + tomoyo_fill_path_info(buf); + return true; } - kfree(buf); - return NULL; + return false; } static int tomoyo_update_path2_acl(const u8 type, const char *filename1, @@ -1259,26 +1261,20 @@ int tomoyo_path_number_perm(const u8 type, struct path *path, { struct tomoyo_request_info r; int error = -ENOMEM; - struct tomoyo_path_info *buf; + struct tomoyo_path_info buf; int idx; if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry) return 0; idx = tomoyo_read_lock(); - buf = tomoyo_get_path(path); - if (!buf) + if (!tomoyo_get_realpath(&buf, path)) goto out; - if (type == TOMOYO_TYPE_MKDIR && !buf->is_dir) { - /* - * tomoyo_get_path() reserves space for appending "/." - */ - strcat((char *) buf->name, "/"); - tomoyo_fill_path_info(buf); - } - error = tomoyo_path_number_perm2(&r, type, buf, number); + if (type == TOMOYO_TYPE_MKDIR) + tomoyo_add_slash(&buf); + error = tomoyo_path_number_perm2(&r, type, &buf, number); out: - kfree(buf); + kfree(buf.name); tomoyo_read_unlock(idx); if (r.mode != TOMOYO_CONFIG_ENFORCING) error = 0; @@ -1319,7 +1315,7 @@ int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, { const u8 acc_mode = ACC_MODE(flag); int error = -ENOMEM; - struct tomoyo_path_info *buf; + struct tomoyo_path_info buf; struct tomoyo_request_info r; int idx; @@ -1335,8 +1331,7 @@ int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, */ return 0; idx = tomoyo_read_lock(); - buf = tomoyo_get_path(path); - if (!buf) + if (!tomoyo_get_realpath(&buf, path)) goto out; error = 0; /* @@ -1346,15 +1341,15 @@ int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, */ if ((acc_mode & MAY_WRITE) && ((flag & O_TRUNC) || !(flag & O_APPEND)) && - (tomoyo_is_no_rewrite_file(buf))) { - error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE, buf); + (tomoyo_is_no_rewrite_file(&buf))) { + error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE, &buf); } if (!error) - error = tomoyo_file_perm(&r, buf, acc_mode); + error = tomoyo_file_perm(&r, &buf, acc_mode); if (!error && (flag & O_TRUNC)) - error = tomoyo_path_permission(&r, TOMOYO_TYPE_TRUNCATE, buf); + error = tomoyo_path_permission(&r, TOMOYO_TYPE_TRUNCATE, &buf); out: - kfree(buf); + kfree(buf.name); tomoyo_read_unlock(idx); if (r.mode != TOMOYO_CONFIG_ENFORCING) error = 0; @@ -1372,7 +1367,7 @@ int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, int tomoyo_path_perm(const u8 operation, struct path *path) { int error = -ENOMEM; - struct tomoyo_path_info *buf; + struct tomoyo_path_info buf; struct tomoyo_request_info r; int idx; @@ -1380,29 +1375,23 @@ int tomoyo_path_perm(const u8 operation, struct path *path) !path->mnt) return 0; idx = tomoyo_read_lock(); - buf = tomoyo_get_path(path); - if (!buf) + if (!tomoyo_get_realpath(&buf, path)) goto out; switch (operation) { case TOMOYO_TYPE_REWRITE: - if (!tomoyo_is_no_rewrite_file(buf)) { + if (!tomoyo_is_no_rewrite_file(&buf)) { error = 0; goto out; } break; case TOMOYO_TYPE_RMDIR: case TOMOYO_TYPE_CHROOT: - if (!buf->is_dir) { - /* - * tomoyo_get_path() reserves space for appending "/." - */ - strcat((char *) buf->name, "/"); - tomoyo_fill_path_info(buf); - } + tomoyo_add_slash(&buf); + break; } - error = tomoyo_path_permission(&r, operation, buf); + error = tomoyo_path_permission(&r, operation, &buf); out: - kfree(buf); + kfree(buf.name); tomoyo_read_unlock(idx); if (r.mode != TOMOYO_CONFIG_ENFORCING) error = 0; @@ -1465,7 +1454,7 @@ int tomoyo_path_number3_perm(const u8 operation, struct path *path, { struct tomoyo_request_info r; int error = -ENOMEM; - struct tomoyo_path_info *buf; + struct tomoyo_path_info buf; int idx; if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED || @@ -1473,11 +1462,10 @@ int tomoyo_path_number3_perm(const u8 operation, struct path *path, return 0; idx = tomoyo_read_lock(); error = -ENOMEM; - buf = tomoyo_get_path(path); - if (buf) { - error = tomoyo_path_number3_perm2(&r, operation, buf, mode, + if (tomoyo_get_realpath(&buf, path)) { + error = tomoyo_path_number3_perm2(&r, operation, &buf, mode, new_decode_dev(dev)); - kfree(buf); + kfree(buf.name); } tomoyo_read_unlock(idx); if (r.mode != TOMOYO_CONFIG_ENFORCING) @@ -1499,48 +1487,40 @@ int tomoyo_path2_perm(const u8 operation, struct path *path1, { int error = -ENOMEM; const char *msg; - struct tomoyo_path_info *buf1; - struct tomoyo_path_info *buf2; + struct tomoyo_path_info buf1; + struct tomoyo_path_info buf2; struct tomoyo_request_info r; int idx; if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED || !path1->mnt || !path2->mnt) return 0; + buf1.name = NULL; + buf2.name = NULL; idx = tomoyo_read_lock(); - buf1 = tomoyo_get_path(path1); - buf2 = tomoyo_get_path(path2); - if (!buf1 || !buf2) + if (!tomoyo_get_realpath(&buf1, path1) || + !tomoyo_get_realpath(&buf2, path2)) goto out; { struct dentry *dentry = path1->dentry; if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { - /* - * tomoyo_get_path() reserves space for appending "/." - */ - if (!buf1->is_dir) { - strcat((char *) buf1->name, "/"); - tomoyo_fill_path_info(buf1); - } - if (!buf2->is_dir) { - strcat((char *) buf2->name, "/"); - tomoyo_fill_path_info(buf2); - } + tomoyo_add_slash(&buf1); + tomoyo_add_slash(&buf2); } } do { - error = tomoyo_path2_acl(&r, operation, buf1, buf2); + error = tomoyo_path2_acl(&r, operation, &buf1, &buf2); if (!error) break; msg = tomoyo_path22keyword(operation); - tomoyo_warn_log(&r, "%s %s %s", msg, buf1->name, buf2->name); + tomoyo_warn_log(&r, "%s %s %s", msg, buf1.name, buf2.name); error = tomoyo_supervisor(&r, "allow_%s %s %s\n", msg, - tomoyo_file_pattern(buf1), - tomoyo_file_pattern(buf2)); + tomoyo_file_pattern(&buf1), + tomoyo_file_pattern(&buf2)); } while (error == TOMOYO_RETRY_REQUEST); out: - kfree(buf1); - kfree(buf2); + kfree(buf1.name); + kfree(buf2.name); tomoyo_read_unlock(idx); if (r.mode != TOMOYO_CONFIG_ENFORCING) error = 0; diff --git a/security/tomoyo/memory.c b/security/tomoyo/memory.c index 8fb73ff5cb6..4809febc1ac 100644 --- a/security/tomoyo/memory.c +++ b/security/tomoyo/memory.c @@ -153,7 +153,6 @@ void __init tomoyo_mm_init(void) { int idx; - BUILD_BUG_ON(TOMOYO_MAX_PATHNAME_LEN > PATH_MAX); for (idx = 0; idx < TOMOYO_MAX_HASH; idx++) INIT_LIST_HEAD(&tomoyo_name_list[idx]); INIT_LIST_HEAD(&tomoyo_kernel_domain.acl_info_list); diff --git a/security/tomoyo/mount.c b/security/tomoyo/mount.c index aeac619f787..7c1c7fdd368 100644 --- a/security/tomoyo/mount.c +++ b/security/tomoyo/mount.c @@ -25,57 +25,6 @@ #define TOMOYO_MOUNT_MAKE_SHARED_KEYWORD "--make-shared" /** - * tomoyo_encode2: Encode binary string to ascii string. - * - * @str: String in binary format. - * - * Returns pointer to @str in ascii format on success, NULL otherwise. - * - * This function uses kzalloc(), so caller must kfree() if this function - * didn't return NULL. - */ -static char *tomoyo_encode2(const char *str) -{ - int len = 0; - const char *p = str; - char *cp; - char *cp0; - if (!p) - return NULL; - while (*p) { - const unsigned char c = *p++; - if (c == '\\') - len += 2; - else if (c > ' ' && c < 127) - len++; - else - len += 4; - } - len++; - /* Reserve space for appending "/". */ - cp = kzalloc(len + 10, GFP_NOFS); - if (!cp) - return NULL; - cp0 = cp; - p = str; - while (*p) { - const unsigned char c = *p++; - if (c == '\\') { - *cp++ = '\\'; - *cp++ = '\\'; - } else if (c > ' ' && c < 127) { - *cp++ = c; - } else { - *cp++ = '\\'; - *cp++ = (c >> 6) + '0'; - *cp++ = ((c >> 3) & 7) + '0'; - *cp++ = (c & 7) + '0'; - } - } - return cp0; -} - -/** * tomoyo_mount_acl2 - Check permission for mount() operation. * * @r: Pointer to "struct tomoyo_request_info". @@ -104,7 +53,7 @@ static int tomoyo_mount_acl2(struct tomoyo_request_info *r, char *dev_name, int error = -ENOMEM; /* Get fstype. */ - requested_type = tomoyo_encode2(type); + requested_type = tomoyo_encode(type); if (!requested_type) goto out; rtype.name = requested_type; @@ -155,7 +104,7 @@ static int tomoyo_mount_acl2(struct tomoyo_request_info *r, char *dev_name, /* Map dev_name to "<NULL>" if no dev_name given. */ if (!dev_name) dev_name = "<NULL>"; - requested_dev_name = tomoyo_encode2(dev_name); + requested_dev_name = tomoyo_encode(dev_name); if (!requested_dev_name) { error = -ENOMEM; goto out; diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c index 1fd685a94ad..153fa23a05c 100644 --- a/security/tomoyo/realpath.c +++ b/security/tomoyo/realpath.c @@ -12,141 +12,153 @@ #include <linux/fs_struct.h> #include <linux/magic.h> #include <linux/slab.h> +#include <net/sock.h> #include "common.h" /** * tomoyo_encode: Convert binary string to ascii string. * - * @buffer: Buffer for ASCII string. - * @buflen: Size of @buffer. - * @str: Binary string. + * @str: String in binary format. * - * Returns 0 on success, -ENOMEM otherwise. + * Returns pointer to @str in ascii format on success, NULL otherwise. + * + * This function uses kzalloc(), so caller must kfree() if this function + * didn't return NULL. */ -int tomoyo_encode(char *buffer, int buflen, const char *str) +char *tomoyo_encode(const char *str) { - while (1) { - const unsigned char c = *(unsigned char *) str++; + int len = 0; + const char *p = str; + char *cp; + char *cp0; - if (tomoyo_is_valid(c)) { - if (--buflen <= 0) - break; - *buffer++ = (char) c; - if (c != '\\') - continue; - if (--buflen <= 0) - break; - *buffer++ = (char) c; - continue; - } - if (!c) { - if (--buflen <= 0) - break; - *buffer = '\0'; - return 0; + if (!p) + return NULL; + while (*p) { + const unsigned char c = *p++; + if (c == '\\') + len += 2; + else if (c > ' ' && c < 127) + len++; + else + len += 4; + } + len++; + /* Reserve space for appending "/". */ + cp = kzalloc(len + 10, GFP_NOFS); + if (!cp) + return NULL; + cp0 = cp; + p = str; + while (*p) { + const unsigned char c = *p++; + + if (c == '\\') { + *cp++ = '\\'; + *cp++ = '\\'; + } else if (c > ' ' && c < 127) { + *cp++ = c; + } else { + *cp++ = '\\'; + *cp++ = (c >> 6) + '0'; + *cp++ = ((c >> 3) & 7) + '0'; + *cp++ = (c & 7) + '0'; } - buflen -= 4; - if (buflen <= 0) - break; - *buffer++ = '\\'; - *buffer++ = (c >> 6) + '0'; - *buffer++ = ((c >> 3) & 7) + '0'; - *buffer++ = (c & 7) + '0'; } - return -ENOMEM; + return cp0; } /** - * tomoyo_realpath_from_path2 - Returns realpath(3) of the given dentry but ignores chroot'ed root. + * tomoyo_realpath_from_path - Returns realpath(3) of the given pathname but ignores chroot'ed root. * - * @path: Pointer to "struct path". - * @newname: Pointer to buffer to return value in. - * @newname_len: Size of @newname. + * @path: Pointer to "struct path". * - * Returns 0 on success, negative value otherwise. + * Returns the realpath of the given @path on success, NULL otherwise. * * If dentry is a directory, trailing '/' is appended. * Characters out of 0x20 < c < 0x7F range are converted to * \ooo style octal string. * Character \ is converted to \\ string. + * + * These functions use kzalloc(), so the caller must call kfree() + * if these functions didn't return NULL. */ -int tomoyo_realpath_from_path2(struct path *path, char *newname, - int newname_len) +char *tomoyo_realpath_from_path(struct path *path) { - int error = -ENOMEM; + char *buf = NULL; + char *name = NULL; + unsigned int buf_len = PAGE_SIZE / 2; struct dentry *dentry = path->dentry; - char *sp; - - if (!dentry || !path->mnt || !newname || newname_len <= 2048) - return -EINVAL; - if (dentry->d_op && dentry->d_op->d_dname) { + bool is_dir; + if (!dentry) + return NULL; + is_dir = dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode); + while (1) { + struct path ns_root = { .mnt = NULL, .dentry = NULL }; + char *pos; + buf_len <<= 1; + kfree(buf); + buf = kmalloc(buf_len, GFP_NOFS); + if (!buf) + break; + /* Get better name for socket. */ + if (dentry->d_sb && dentry->d_sb->s_magic == SOCKFS_MAGIC) { + struct inode *inode = dentry->d_inode; + struct socket *sock = inode ? SOCKET_I(inode) : NULL; + struct sock *sk = sock ? sock->sk : NULL; + if (sk) { + snprintf(buf, buf_len - 1, "socket:[family=%u:" + "type=%u:protocol=%u]", sk->sk_family, + sk->sk_type, sk->sk_protocol); + } else { + snprintf(buf, buf_len - 1, "socket:[unknown]"); + } + name = tomoyo_encode(buf); + break; + } /* For "socket:[\$]" and "pipe:[\$]". */ - static const int offset = 1536; - sp = dentry->d_op->d_dname(dentry, newname + offset, - newname_len - offset); - } else { - struct path ns_root = {.mnt = NULL, .dentry = NULL}; - + if (dentry->d_op && dentry->d_op->d_dname) { + pos = dentry->d_op->d_dname(dentry, buf, buf_len - 1); + if (IS_ERR(pos)) + continue; + name = tomoyo_encode(pos); + break; + } + /* If we don't have a vfsmount, we can't calculate. */ + if (!path->mnt) + break; spin_lock(&dcache_lock); /* go to whatever namespace root we are under */ - sp = __d_path(path, &ns_root, newname, newname_len); + pos = __d_path(path, &ns_root, buf, buf_len); spin_unlock(&dcache_lock); /* Prepend "/proc" prefix if using internal proc vfs mount. */ - if (!IS_ERR(sp) && (path->mnt->mnt_flags & MNT_INTERNAL) && + if (!IS_ERR(pos) && (path->mnt->mnt_flags & MNT_INTERNAL) && (path->mnt->mnt_sb->s_magic == PROC_SUPER_MAGIC)) { - sp -= 5; - if (sp >= newname) - memcpy(sp, "/proc", 5); + pos -= 5; + if (pos >= buf) + memcpy(pos, "/proc", 5); else - sp = ERR_PTR(-ENOMEM); - } - } - if (IS_ERR(sp)) - error = PTR_ERR(sp); - else - error = tomoyo_encode(newname, sp - newname, sp); - /* Append trailing '/' if dentry is a directory. */ - if (!error && dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode) - && *newname) { - sp = newname + strlen(newname); - if (*(sp - 1) != '/') { - if (sp < newname + newname_len - 4) { - *sp++ = '/'; - *sp = '\0'; - } else { - error = -ENOMEM; - } + pos = ERR_PTR(-ENOMEM); } + if (IS_ERR(pos)) + continue; + name = tomoyo_encode(pos); + break; } - if (error) - tomoyo_warn_oom(__func__); - return error; -} - -/** - * tomoyo_realpath_from_path - Returns realpath(3) of the given pathname but ignores chroot'ed root. - * - * @path: Pointer to "struct path". - * - * Returns the realpath of the given @path on success, NULL otherwise. - * - * These functions use kzalloc(), so the caller must call kfree() - * if these functions didn't return NULL. - */ -char *tomoyo_realpath_from_path(struct path *path) -{ - char *buf = kzalloc(sizeof(struct tomoyo_page_buffer), GFP_NOFS); - - BUILD_BUG_ON(TOMOYO_MAX_PATHNAME_LEN > PATH_MAX); - BUILD_BUG_ON(sizeof(struct tomoyo_page_buffer) - <= TOMOYO_MAX_PATHNAME_LEN - 1); - if (!buf) - return NULL; - if (tomoyo_realpath_from_path2(path, buf, - TOMOYO_MAX_PATHNAME_LEN - 1) == 0) - return buf; kfree(buf); - return NULL; + if (!name) + tomoyo_warn_oom(__func__); + else if (is_dir && *name) { + /* Append trailing '/' if dentry is a directory. */ + char *pos = name + strlen(name) - 1; + if (*pos != '/') + /* + * This is OK because tomoyo_encode() reserves space + * for appending "/". + */ + *++pos = '/'; + } + return name; } /** |