diff options
| -rw-r--r-- | security/tomoyo/audit.c | 111 | ||||
| -rw-r--r-- | security/tomoyo/common.c | 48 | ||||
| -rw-r--r-- | security/tomoyo/common.h | 45 | ||||
| -rw-r--r-- | security/tomoyo/condition.c | 337 | ||||
| -rw-r--r-- | security/tomoyo/domain.c | 46 | ||||
| -rw-r--r-- | security/tomoyo/gc.c | 12 |
6 files changed, 589 insertions, 10 deletions
diff --git a/security/tomoyo/audit.c b/security/tomoyo/audit.c index b33a20accbef..eefedd9e48e6 100644 --- a/security/tomoyo/audit.c +++ b/security/tomoyo/audit.c @@ -10,6 +10,104 @@ #include <linux/slab.h> /** + * tomoyo_print_bprm - Print "struct linux_binprm" for auditing. + * + * @bprm: Pointer to "struct linux_binprm". + * @dump: Pointer to "struct tomoyo_page_dump". + * + * Returns the contents of @bprm on success, NULL otherwise. + * + * This function uses kzalloc(), so caller must kfree() if this function + * didn't return NULL. + */ +static char *tomoyo_print_bprm(struct linux_binprm *bprm, + struct tomoyo_page_dump *dump) +{ + static const int tomoyo_buffer_len = 4096 * 2; + char *buffer = kzalloc(tomoyo_buffer_len, GFP_NOFS); + char *cp; + char *last_start; + int len; + unsigned long pos = bprm->p; + int offset = pos % PAGE_SIZE; + int argv_count = bprm->argc; + int envp_count = bprm->envc; + bool truncated = false; + if (!buffer) + return NULL; + len = snprintf(buffer, tomoyo_buffer_len - 1, "argv[]={ "); + cp = buffer + len; + if (!argv_count) { + memmove(cp, "} envp[]={ ", 11); + cp += 11; + } + last_start = cp; + while (argv_count || envp_count) { + if (!tomoyo_dump_page(bprm, pos, dump)) + goto out; + pos += PAGE_SIZE - offset; + /* Read. */ + while (offset < PAGE_SIZE) { + const char *kaddr = dump->data; + const unsigned char c = kaddr[offset++]; + if (cp == last_start) + *cp++ = '"'; + if (cp >= buffer + tomoyo_buffer_len - 32) { + /* Reserve some room for "..." string. */ + truncated = true; + } else if (c == '\\') { + *cp++ = '\\'; + *cp++ = '\\'; + } else if (c > ' ' && c < 127) { + *cp++ = c; + } else if (!c) { + *cp++ = '"'; + *cp++ = ' '; + last_start = cp; + } else { + *cp++ = '\\'; + *cp++ = (c >> 6) + '0'; + *cp++ = ((c >> 3) & 7) + '0'; + *cp++ = (c & 7) + '0'; + } + if (c) + continue; + if (argv_count) { + if (--argv_count == 0) { + if (truncated) { + cp = last_start; + memmove(cp, "... ", 4); + cp += 4; + } + memmove(cp, "} envp[]={ ", 11); + cp += 11; + last_start = cp; + truncated = false; + } + } else if (envp_count) { + if (--envp_count == 0) { + if (truncated) { + cp = last_start; + memmove(cp, "... ", 4); + cp += 4; + } + } + } + if (!argv_count && !envp_count) + break; + } + offset = 0; + } + *cp++ = '}'; + *cp = '\0'; + return buffer; +out: + snprintf(buffer, tomoyo_buffer_len - 1, + "argv[]={ ... } envp[]= { ... }"); + return buffer; +} + +/** * tomoyo_filetype - Get string representation of file type. * * @mode: Mode value for stat(). @@ -139,6 +237,7 @@ char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt, va_list args) { char *buf = NULL; + char *bprm_info = NULL; const char *header = NULL; char *realpath = NULL; const char *symlink = NULL; @@ -152,10 +251,11 @@ char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt, if (r->ee) { struct file *file = r->ee->bprm->file; realpath = tomoyo_realpath_from_path(&file->f_path); - if (!realpath) + bprm_info = tomoyo_print_bprm(r->ee->bprm, &r->ee->dump); + if (!realpath || !bprm_info) goto out; - /* +80 is for " exec={ realpath=\"%s\" }" */ - len += strlen(realpath) + 80; + /* +80 is for " exec={ realpath=\"%s\" argc=%d envc=%d %s }" */ + len += strlen(realpath) + 80 + strlen(bprm_info); } else if (r->obj && r->obj->symlink_target) { symlink = r->obj->symlink_target->name; /* +18 is for " symlink.target=\"%s\"" */ @@ -168,8 +268,10 @@ char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt, len--; pos = snprintf(buf, len, "%s", header); if (realpath) { + struct linux_binprm *bprm = r->ee->bprm; pos += snprintf(buf + pos, len - pos, - " exec={ realpath=\"%s\" }", realpath); + " exec={ realpath=\"%s\" argc=%d envc=%d %s }", + realpath, bprm->argc, bprm->envc, bprm_info); } else if (symlink) pos += snprintf(buf + pos, len - pos, " symlink.target=\"%s\"", symlink); @@ -177,6 +279,7 @@ char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt, vsnprintf(buf + pos, len - pos, fmt, args); out: kfree(realpath); + kfree(bprm_info); kfree(header); return buf; } diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c index 69d6b59f5937..4f9047e94bd1 100644 --- a/security/tomoyo/common.c +++ b/security/tomoyo/common.c @@ -60,6 +60,8 @@ const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = { [TOMOYO_TASK_FSGID] = "task.fsgid", [TOMOYO_TASK_PID] = "task.pid", [TOMOYO_TASK_PPID] = "task.ppid", + [TOMOYO_EXEC_ARGC] = "exec.argc", + [TOMOYO_EXEC_ENVC] = "exec.envc", [TOMOYO_TYPE_IS_SOCKET] = "socket", [TOMOYO_TYPE_IS_SYMLINK] = "symlink", [TOMOYO_TYPE_IS_FILE] = "file", @@ -1127,12 +1129,22 @@ static bool tomoyo_print_condition(struct tomoyo_io_buffer *head, const struct tomoyo_name_union *names_p = (typeof(names_p)) (numbers_p + cond->numbers_count); + const struct tomoyo_argv *argv = + (typeof(argv)) (names_p + cond->names_count); + const struct tomoyo_envp *envp = + (typeof(envp)) (argv + cond->argc); u16 skip; for (skip = 0; skip < head->r.cond_index; skip++) { const u8 left = condp->left; const u8 right = condp->right; condp++; switch (left) { + case TOMOYO_ARGV_ENTRY: + argv++; + continue; + case TOMOYO_ENVP_ENTRY: + envp++; + continue; case TOMOYO_NUMBER_UNION: numbers_p++; break; @@ -1156,6 +1168,34 @@ static bool tomoyo_print_condition(struct tomoyo_io_buffer *head, head->r.cond_index++; tomoyo_set_space(head); switch (left) { + case TOMOYO_ARGV_ENTRY: + tomoyo_io_printf(head, + "exec.argv[%lu]%s=\"", + argv->index, argv-> + is_not ? "!" : ""); + tomoyo_set_string(head, + argv->value->name); + tomoyo_set_string(head, "\""); + argv++; + continue; + case TOMOYO_ENVP_ENTRY: + tomoyo_set_string(head, + "exec.envp[\""); + tomoyo_set_string(head, + envp->name->name); + tomoyo_io_printf(head, "\"]%s=", envp-> + is_not ? "!" : ""); + if (envp->value) { + tomoyo_set_string(head, "\""); + tomoyo_set_string(head, envp-> + value->name); + tomoyo_set_string(head, "\""); + } else { + tomoyo_set_string(head, + "NULL"); + } + envp++; + continue; case TOMOYO_NUMBER_UNION: tomoyo_print_number_union_nospace (head, numbers_p++); @@ -1726,6 +1766,7 @@ static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header) { char *buffer; char *realpath = NULL; + char *argv0 = NULL; char *symlink = NULL; char *cp = strchr(header, '\n'); int len; @@ -1738,6 +1779,11 @@ static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header) len = strlen(cp) + 1; /* strstr() will return NULL if ordering is wrong. */ if (*cp == 'f') { + argv0 = strstr(header, " argv[]={ \""); + if (argv0) { + argv0 += 10; + len += tomoyo_truncate(argv0) + 14; + } realpath = strstr(header, " exec={ realpath=\""); if (realpath) { realpath += 8; @@ -1753,6 +1799,8 @@ static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header) snprintf(buffer, len - 1, "%s", cp); if (realpath) tomoyo_addprintf(buffer, len, " exec.%s", realpath); + if (argv0) + tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0); if (symlink) tomoyo_addprintf(buffer, len, "%s", symlink); tomoyo_normalize_line(buffer); diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h index 7e56e6b364e5..6c013b177791 100644 --- a/security/tomoyo/common.h +++ b/security/tomoyo/common.h @@ -54,6 +54,8 @@ enum tomoyo_conditions_index { TOMOYO_TASK_FSGID, /* current_fsgid() */ TOMOYO_TASK_PID, /* sys_getpid() */ TOMOYO_TASK_PPID, /* sys_getppid() */ + TOMOYO_EXEC_ARGC, /* "struct linux_binprm *"->argc */ + TOMOYO_EXEC_ENVC, /* "struct linux_binprm *"->envc */ TOMOYO_TYPE_IS_SOCKET, /* S_IFSOCK */ TOMOYO_TYPE_IS_SYMLINK, /* S_IFLNK */ TOMOYO_TYPE_IS_FILE, /* S_IFREG */ @@ -104,6 +106,8 @@ enum tomoyo_conditions_index { TOMOYO_MAX_CONDITION_KEYWORD, TOMOYO_NUMBER_UNION, TOMOYO_NAME_UNION, + TOMOYO_ARGV_ENTRY, + TOMOYO_ENVP_ENTRY, }; @@ -467,6 +471,12 @@ struct tomoyo_mini_stat { dev_t rdev; }; +/* Structure for dumping argv[] and envp[] of "struct linux_binprm". */ +struct tomoyo_page_dump { + struct page *page; /* Previously dumped page. */ + char *data; /* Contents of "page". Size is PAGE_SIZE. */ +}; + /* Structure for attribute checks in addition to pathname checks. */ struct tomoyo_obj_info { /* @@ -491,20 +501,45 @@ struct tomoyo_obj_info { struct tomoyo_path_info *symlink_target; }; +/* Structure for argv[]. */ +struct tomoyo_argv { + unsigned long index; + const struct tomoyo_path_info *value; + bool is_not; +}; + +/* Structure for envp[]. */ +struct tomoyo_envp { + const struct tomoyo_path_info *name; + const struct tomoyo_path_info *value; + bool is_not; +}; + /* Structure for execve() operation. */ struct tomoyo_execve { struct tomoyo_request_info r; struct tomoyo_obj_info obj; struct linux_binprm *bprm; + /* For dumping argv[] and envp[]. */ + struct tomoyo_page_dump dump; /* For temporary use. */ char *tmp; /* Size is TOMOYO_EXEC_TMPSIZE bytes */ }; /* Structure for entries which follows "struct tomoyo_condition". */ struct tomoyo_condition_element { - /* Left hand operand. */ + /* + * Left hand operand. A "struct tomoyo_argv" for TOMOYO_ARGV_ENTRY, a + * "struct tomoyo_envp" for TOMOYO_ENVP_ENTRY is attached to the tail + * of the array of this struct. + */ u8 left; - /* Right hand operand. */ + /* + * Right hand operand. A "struct tomoyo_number_union" for + * TOMOYO_NUMBER_UNION, a "struct tomoyo_name_union" for + * TOMOYO_NAME_UNION is attached to the tail of the array of this + * struct. + */ u8 right; /* Equation operator. True if equals or overlaps, false otherwise. */ bool equals; @@ -517,10 +552,14 @@ struct tomoyo_condition { u16 condc; /* Number of conditions in this struct. */ u16 numbers_count; /* Number of "struct tomoyo_number_union values". */ u16 names_count; /* Number of "struct tomoyo_name_union names". */ + u16 argc; /* Number of "struct tomoyo_argv". */ + u16 envc; /* Number of "struct tomoyo_envp". */ /* * struct tomoyo_condition_element condition[condc]; * struct tomoyo_number_union values[numbers_count]; * struct tomoyo_name_union names[names_count]; + * struct tomoyo_argv argv[argc]; + * struct tomoyo_envp envp[envc]; */ }; @@ -751,6 +790,8 @@ bool tomoyo_correct_path(const char *filename); bool tomoyo_correct_word(const char *string); bool tomoyo_domain_def(const unsigned char *buffer); bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r); +bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos, + struct tomoyo_page_dump *dump); bool tomoyo_memory_ok(void *ptr); bool tomoyo_number_matches_group(const unsigned long min, const unsigned long max, diff --git a/security/tomoyo/condition.c b/security/tomoyo/condition.c index 790b9872cc37..8a05f71eaf67 100644 --- a/security/tomoyo/condition.c +++ b/security/tomoyo/condition.c @@ -11,6 +11,209 @@ LIST_HEAD(tomoyo_condition_list); /** + * tomoyo_argv - Check argv[] in "struct linux_binbrm". + * + * @index: Index number of @arg_ptr. + * @arg_ptr: Contents of argv[@index]. + * @argc: Length of @argv. + * @argv: Pointer to "struct tomoyo_argv". + * @checked: Set to true if @argv[@index] was found. + * + * Returns true on success, false otherwise. + */ +static bool tomoyo_argv(const unsigned int index, const char *arg_ptr, + const int argc, const struct tomoyo_argv *argv, + u8 *checked) +{ + int i; + struct tomoyo_path_info arg; + arg.name = arg_ptr; + for (i = 0; i < argc; argv++, checked++, i++) { + bool result; + if (index != argv->index) + continue; + *checked = 1; + tomoyo_fill_path_info(&arg); + result = tomoyo_path_matches_pattern(&arg, argv->value); + if (argv->is_not) + result = !result; + if (!result) + return false; + } + return true; +} + +/** + * tomoyo_envp - Check envp[] in "struct linux_binbrm". + * + * @env_name: The name of environment variable. + * @env_value: The value of environment variable. + * @envc: Length of @envp. + * @envp: Pointer to "struct tomoyo_envp". + * @checked: Set to true if @envp[@env_name] was found. + * + * Returns true on success, false otherwise. + */ +static bool tomoyo_envp(const char *env_name, const char *env_value, + const int envc, const struct tomoyo_envp *envp, + u8 *checked) +{ + int i; + struct tomoyo_path_info name; + struct tomoyo_path_info value; + name.name = env_name; + tomoyo_fill_path_info(&name); + value.name = env_value; + tomoyo_fill_path_info(&value); + for (i = 0; i < envc; envp++, checked++, i++) { + bool result; + if (!tomoyo_path_matches_pattern(&name, envp->name)) + continue; + *checked = 1; + if (envp->value) { + result = tomoyo_path_matches_pattern(&value, + envp->value); + if (envp->is_not) + result = !result; + } else { + result = true; + if (!envp->is_not) + result = !result; + } + if (!result) + return false; + } + return true; +} + +/** + * tomoyo_scan_bprm - Scan "struct linux_binprm". + * + * @ee: Pointer to "struct tomoyo_execve". + * @argc: Length of @argc. + * @argv: Pointer to "struct tomoyo_argv". + * @envc: Length of @envp. + * @envp: Poiner to "struct tomoyo_envp". + * + * Returns true on success, false otherwise. + */ +static bool tomoyo_scan_bprm(struct tomoyo_execve *ee, + const u16 argc, const struct tomoyo_argv *argv, + const u16 envc, const struct tomoyo_envp *envp) +{ + struct linux_binprm *bprm = ee->bprm; + struct tomoyo_page_dump *dump = &ee->dump; + char *arg_ptr = ee->tmp; + int arg_len = 0; + unsigned long pos = bprm->p; + int offset = pos % PAGE_SIZE; + int argv_count = bprm->argc; + int envp_count = bprm->envc; + bool result = true; + u8 local_checked[32]; + u8 *checked; + if (argc + envc <= sizeof(local_checked)) { + checked = local_checked; + memset(local_checked, 0, sizeof(local_checked)); + } else { + checked = kzalloc(argc + envc, GFP_NOFS); + if (!checked) + return false; + } + while (argv_count || envp_count) { + if (!tomoyo_dump_page(bprm, pos, dump)) { + result = false; + goto out; + } + pos += PAGE_SIZE - offset; + while (offset < PAGE_SIZE) { + /* Read. */ + const char *kaddr = dump->data; + const unsigned char c = kaddr[offset++]; + if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) { + if (c == '\\') { + arg_ptr[arg_len++] = '\\'; + arg_ptr[arg_len++] = '\\'; + } else if (c > ' ' && c < 127) { + arg_ptr[arg_len++] = c; + } else { + arg_ptr[arg_len++] = '\\'; + arg_ptr[arg_len++] = (c >> 6) + '0'; + arg_ptr[arg_len++] = + ((c >> 3) & 7) + '0'; + arg_ptr[arg_len++] = (c & 7) + '0'; + } + } else { + arg_ptr[arg_len] = '\0'; + } + if (c) + continue; + /* Check. */ + if (argv_count) { + if (!tomoyo_argv(bprm->argc - argv_count, + arg_ptr, argc, argv, + checked)) { + result = false; + break; + } + argv_count--; + } else if (envp_count) { + char *cp = strchr(arg_ptr, '='); + if (cp) { + *cp = '\0'; + if (!tomoyo_envp(arg_ptr, cp + 1, + envc, envp, + checked + argc)) { + result = false; + break; + } + } + envp_count--; + } else { + break; + } + arg_len = 0; + } + offset = 0; + if (!result) + break; + } +out: + if (result) { + int i; + /* Check not-yet-checked entries. */ + for (i = 0; i < argc; i++) { + if (checked[i]) + continue; + /* + * Return true only if all unchecked indexes in + * bprm->argv[] are not matched. + */ + if (argv[i].is_not) + continue; + result = false; + break; + } + for (i = 0; i < envc; envp++, i++) { + if (checked[argc + i]) + continue; + /* + * Return true only if all unchecked environ variables + * in bprm->envp[] are either undefined or not matched. + */ + if ((!envp->value && !envp->is_not) || + (envp->value && envp->is_not)) + continue; + result = false; + break; + } + } + if (checked != local_checked) + kfree(checked); + return result; +} + +/** * tomoyo_scan_exec_realpath - Check "exec.realpath" parameter of "struct tomoyo_condition". * * @file: Pointer to "struct file". @@ -73,6 +276,64 @@ static bool tomoyo_parse_name_union_quoted(struct tomoyo_acl_param *param, } /** + * tomoyo_parse_argv - Parse an argv[] condition part. + * + * @left: Lefthand value. + * @right: Righthand value. + * @argv: Pointer to "struct tomoyo_argv". + * + * Returns true on success, false otherwise. + */ +static bool tomoyo_parse_argv(char *left, char *right, + struct tomoyo_argv *argv) +{ + if (tomoyo_parse_ulong(&argv->index, &left) != + TOMOYO_VALUE_TYPE_DECIMAL || *left++ != ']' || *left) + return false; + argv->value = tomoyo_get_dqword(right); + return argv->value != NULL; +} + +/** + * tomoyo_parse_envp - Parse an envp[] condition part. + * + * @left: Lefthand value. + * @right: Righthand value. + * @envp: Pointer to "struct tomoyo_envp". + * + * Returns true on success, false otherwise. + */ +static bool tomoyo_parse_envp(char *left, char *right, + struct tomoyo_envp *envp) +{ + const struct tomoyo_path_info *name; + const struct tomoyo_path_info *value; + char *cp = left + strlen(left) - 1; + if (*cp-- != ']' || *cp != '"') + goto out; + *cp = '\0'; + if (!tomoyo_correct_word(left)) + goto out; + name = tomoyo_get_name(left); + if (!name) + goto out; + if (!strcmp(right, "NULL")) { + value = NULL; + } else { + value = tomoyo_get_dqword(right); + if (!value) { + tomoyo_put_name(name); + goto out; + } + } + envp->name = name; + envp->value = value; + return true; +out: + return false; +} + +/** * tomoyo_same_condition - Check for duplicated "struct tomoyo_condition" entry. * * @a: Pointer to "struct tomoyo_condition". @@ -86,6 +347,7 @@ static inline bool tomoyo_same_condition(const struct tomoyo_condition *a, return a->size == b->size && a->condc == b->condc && a->numbers_count == b->numbers_count && a->names_count == b->names_count && + a->argc == b->argc && a->envc == b->envc && !memcmp(a + 1, b + 1, a->size - sizeof(*a)); } @@ -178,6 +440,8 @@ struct tomoyo_condition *tomoyo_get_condition(struct tomoyo_acl_param *param) struct tomoyo_condition_element *condp = NULL; struct tomoyo_number_union *numbers_p = NULL; struct tomoyo_name_union *names_p = NULL; + struct tomoyo_argv *argv = NULL; + struct tomoyo_envp *envp = NULL; struct tomoyo_condition e = { }; char * const start_of_string = param->data; char * const end_of_string = start_of_string + strlen(start_of_string); @@ -222,6 +486,36 @@ rerun: goto out; dprintk(KERN_WARNING "%u: <%s>%s=<%s>\n", __LINE__, left_word, is_not ? "!" : "", right_word); + if (!strncmp(left_word, "exec.argv[", 10)) { + if (!argv) { + e.argc++; + e.condc++; + } else { + e.argc--; + e.condc--; + left = TOMOYO_ARGV_ENTRY; + argv->is_not = is_not; + if (!tomoyo_parse_argv(left_word + 10, + right_word, argv++)) + goto out; + } + goto store_value; + } + if (!strncmp(left_word, "exec.envp[\"", 11)) { + if (!envp) { + e.envc++; + e.condc++; + } else { + e.envc--; + e.condc--; + left = TOMOYO_ENVP_ENTRY; + envp->is_not = is_not; + if (!tomoyo_parse_envp(left_word + 11, + right_word, envp++)) + goto out; + } + goto store_value; + } left = tomoyo_condition_type(left_word); dprintk(KERN_WARNING "%u: <%s> left=%u\n", __LINE__, left_word, left); @@ -283,16 +577,20 @@ store_value: condp->equals); condp++; } - dprintk(KERN_INFO "%u: cond=%u numbers=%u names=%u\n", - __LINE__, e.condc, e.numbers_count, e.names_count); + dprintk(KERN_INFO "%u: cond=%u numbers=%u names=%u ac=%u ec=%u\n", + __LINE__, e.condc, e.numbers_count, e.names_count, e.argc, + e.envc); if (entry) { - BUG_ON(e.names_count | e.numbers_count | e.condc); + BUG_ON(e.names_count | e.numbers_count | e.argc | e.envc | + e.condc); return tomoyo_commit_condition(entry); } e.size = sizeof(*entry) + e.condc * sizeof(struct tomoyo_condition_element) + e.numbers_count * sizeof(struct tomoyo_number_union) - + e.names_count * sizeof(struct tomoyo_name_union); + + e.names_count * sizeof(struct tomoyo_name_union) + + e.argc * sizeof(struct tomoyo_argv) + + e.envc * sizeof(struct tomoyo_envp); entry = kzalloc(e.size, GFP_NOFS); if (!entry) return NULL; @@ -300,6 +598,8 @@ store_value: condp = (struct tomoyo_condition_element *) (entry + 1); numbers_p = (struct tomoyo_number_union *) (condp + e.condc); names_p = (struct tomoyo_name_union *) (numbers_p + e.numbers_count); + argv = (struct tomoyo_argv *) (names_p + e.names_count); + envp = (struct tomoyo_envp *) (argv + e.argc); { bool flag = false; for (pos = start_of_string; pos < end_of_string; pos++) { @@ -391,16 +691,29 @@ bool tomoyo_condition(struct tomoyo_request_info *r, const struct tomoyo_condition_element *condp; const struct tomoyo_number_union *numbers_p; const struct tomoyo_name_union *names_p; + const struct tomoyo_argv *argv; + const struct tomoyo_envp *envp; struct tomoyo_obj_info *obj; u16 condc; + u16 argc; + u16 envc; + struct linux_binprm *bprm = NULL; if (!cond) return true; condc = cond->condc; + argc = cond->argc; + envc = cond->envc; obj = r->obj; + if (r->ee) + bprm = r->ee->bprm; + if (!bprm && (argc || envc)) + return false; condp = (struct tomoyo_condition_element *) (cond + 1); numbers_p = (const struct tomoyo_number_union *) (condp + condc); names_p = (const struct tomoyo_name_union *) (numbers_p + cond->numbers_count); + argv = (const struct tomoyo_argv *) (names_p + cond->names_count); + envp = (const struct tomoyo_envp *) (argv + argc); for (i = 0; i < condc; i++) { const bool match = condp->equals; const u8 left = condp->left; @@ -408,6 +721,9 @@ bool tomoyo_condition(struct tomoyo_request_info *r, bool is_bitop[2] = { false, false }; u8 j; condp++; + /* Check argv[] and envp[] later. */ + if (left == TOMOYO_ARGV_ENTRY || left == TOMOYO_ENVP_ENTRY) + continue; /* Check string expressions. */ if (right == TOMOYO_NAME_UNION) { const struct tomoyo_name_union *ptr = names_p++; @@ -524,6 +840,16 @@ bool tomoyo_condition(struct tomoyo_request_info *r, case TOMOYO_MODE_OTHERS_EXECUTE: value = S_IXOTH; break; + case TOMOYO_EXEC_ARGC: + if (!bprm) + goto out; + value = bprm->argc; + break; + case TOMOYO_EXEC_ENVC: + if (!bprm) + goto out; + value = bprm->envc; + break; case TOMOYO_NUMBER_UNION: /* Fetch values later. */ break; @@ -702,5 +1028,8 @@ bool tomoyo_condition(struct tomoyo_request_info *r, out: return false; } + /* Check argv[] and envp[] now. */ + if (r->ee && (argc || envc)) + return tomoyo_scan_bprm(r->ee, argc, argv, envc, envp); return true; } diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c index 0f02c7852090..565249c42e39 100644 --- a/security/tomoyo/domain.c +++ b/security/tomoyo/domain.c @@ -713,3 +713,49 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm) kfree(tmp); return retval; } + +/** + * tomoyo_dump_page - Dump a page to buffer. + * + * @bprm: Pointer to "struct linux_binprm". + * @pos: Location to dump. + * @dump: Poiner to "struct tomoyo_page_dump". + * + * Returns true on success, false otherwise. + */ +bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos, + struct tomoyo_page_dump *dump) +{ + struct page *page; + /* dump->data is released by tomoyo_finish_execve(). */ + if (!dump->data) { + dump->data = kzalloc(PAGE_SIZE, GFP_NOFS); + if (!dump->data) + return false; + } + /* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ +#ifdef CONFIG_MMU + if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) + return false; +#else + page = bprm->page[pos / PAGE_SIZE]; +#endif + if (page != dump->page) { + const unsigned int offset = pos % PAGE_SIZE; + /* + * Maybe kmap()/kunmap() should be used here. + * But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). + * So do I. + */ + char *kaddr = kmap_atomic(page, KM_USER0); + dump->page = page; + memcpy(dump->data + offset, kaddr + offset, + PAGE_SIZE - offset); + kunmap_atomic(kaddr, KM_USER0); + } + /* Same with put_arg_page(page) in fs/exec.c */ +#ifdef CONFIG_MMU + put_page(page); +#endif + return true; +} diff --git a/security/tomoyo/gc.c b/security/tomoyo/gc.c index e0502b6d5866..1ac3312059f6 100644 --- a/security/tomoyo/gc.c +++ b/security/tomoyo/gc.c @@ -358,6 +358,8 @@ void tomoyo_del_condition(struct list_head *element) const u16 condc = cond->condc; const u16 numbers_count = cond->numbers_count; const u16 names_count = cond->names_count; + const u16 argc = cond->argc; + const u16 envc = cond->envc; unsigned int i; const struct tomoyo_condition_element *condp = (const struct tomoyo_condition_element *) (cond + 1); @@ -365,10 +367,20 @@ void tomoyo_del_condition(struct list_head *element) = (struct tomoyo_number_union *) (condp + condc); struct tomoyo_name_union *names_p = (struct tomoyo_name_union *) (numbers_p + numbers_count); + const struct tomoyo_argv *argv + = (const struct tomoyo_argv *) (names_p + names_count); + const struct tomoyo_envp *envp + = (const struct tomoyo_envp *) (argv + argc); for (i = 0; i < numbers_count; i++) tomoyo_put_number_union(numbers_p++); for (i = 0; i < names_count; i++) tomoyo_put_name_union(names_p++); + for (i = 0; i < argc; argv++, i++) + tomoyo_put_name(argv->value); + for (i = 0; i < envc; envp++, i++) { + tomoyo_put_name(envp->name); + tomoyo_put_name(envp->value); + } } /** |