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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2010-06-03 20:36:43 +0900
committerJames Morris <jmorris@namei.org>2010-08-02 15:33:41 +1000
commitc8c57e842720d8cc92ac8607f2d1c16d92314573 (patch)
treedc921366b931ba5817ad530433f3b1ee178bc56a /security
parent9b244373da3eab671da6c5125482121528a9ebf3 (diff)
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TOMOYO: Support longer pathname.
Allow pathnames longer than 4000 bytes. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security')
-rw-r--r--security/tomoyo/common.h48
-rw-r--r--security/tomoyo/domain.c72
-rw-r--r--security/tomoyo/file.c136
-rw-r--r--security/tomoyo/memory.c1
-rw-r--r--security/tomoyo/mount.c55
-rw-r--r--security/tomoyo/realpath.c214
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;
}
/**