nathan/Chromebook-Device-Nyan-NVIDIA-Tegra-K1-T124-Upstream-Linux-3.10-LTS-Kernel
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Updated AppArmor with a newer backported AppArmor release by UBports

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This commit is contained in:
Nathan
2025-04-08 19:57:41 -05:00
parent fb417c8ab5
commit 3337d21439
45 changed files with 9343 additions and 1547 deletions
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173
security/apparmor/path.c
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@@ -25,7 +25,6 @@
#include "include/path.h"
#include "include/policy.h"
/* modified from dcache.c */
static int prepend(char **buffer, int buflen, const char *str, int namelen)
{
@@ -39,13 +38,50 @@ static int prepend(char **buffer, int buflen, const char *str, int namelen)
#define CHROOT_NSCONNECT (PATH_CHROOT_REL | PATH_CHROOT_NSCONNECT)
/* If the path is not connected to the expected root,
* check if it is a sysctl and handle specially else remove any
* leading / that __d_path may have returned.
* Unless
* specifically directed to connect the path,
* OR
* if in a chroot and doing chroot relative paths and the path
* resolves to the namespace root (would be connected outside
* of chroot) and specifically directed to connect paths to
* namespace root.
*/
static int disconnect(struct path *path, char *buf, char **name, int flags,
const char *disconnected)
{
int error = 0;
if (!(flags & PATH_CONNECT_PATH) &&
!(((flags & CHROOT_NSCONNECT) == CHROOT_NSCONNECT) &&
our_mnt(path->mnt))) {
/* disconnected path, don't return pathname starting
* with '/'
*/
error = -EACCES;
if (**name == '/')
*name = *name + 1;
} else {
if (**name != '/')
/* CONNECT_PATH with missing root */
error = prepend(name, *name - buf, "/", 1);
if (!error && disconnected)
error = prepend(name, *name - buf, disconnected,
strlen(disconnected));
}
return error;
}
/**
* d_namespace_path - lookup a name associated with a given path
* @path: path to lookup (NOT NULL)
* @buf: buffer to store path to (NOT NULL)
* @buflen: length of @buf
* @name: Returns - pointer for start of path name with in @buf (NOT NULL)
* @flags: flags controlling path lookup
* @disconnected: string to prefix to disconnected paths
*
* Handle path name lookup.
*
@@ -53,12 +89,14 @@ static int prepend(char **buffer, int buflen, const char *str, int namelen)
* When no error the path name is returned in @name which points to
* to a position in @buf
*/
static int d_namespace_path(struct path *path, char *buf, int buflen,
char **name, int flags)
static int d_namespace_path(struct path *path, char *buf, char **name,
int flags, const char *disconnected)
{
char *res;
int error = 0;
int connected = 1;
int isdir = (flags & PATH_IS_DIR) ? 1 : 0;
int buflen = aa_g_path_max - isdir;
if (path->mnt->mnt_flags & MNT_INTERNAL) {
/* it's not mounted anywhere */
@@ -73,9 +111,12 @@ static int d_namespace_path(struct path *path, char *buf, int buflen,
/* TODO: convert over to using a per namespace
* control instead of hard coded /proc
*/
return prepend(name, *name - buf, "/proc", 5);
}
return 0;
error = prepend(name, *name - buf, "/proc", 5);
goto out;
} else
error = disconnect(path, buf, name, flags,
disconnected);
goto out;
}
/* resolve paths relative to chroot?*/
@@ -94,8 +135,11 @@ static int d_namespace_path(struct path *path, char *buf, int buflen,
* be returned.
*/
if (!res || IS_ERR(res)) {
if (PTR_ERR(res) == -ENAMETOOLONG)
return -ENAMETOOLONG;
if (PTR_ERR(res) == -ENAMETOOLONG) {
error = -ENAMETOOLONG;
*name = buf;
goto out;
}
connected = 0;
res = dentry_path_raw(path->dentry, buf, buflen);
if (IS_ERR(res)) {
@@ -114,84 +158,34 @@ static int d_namespace_path(struct path *path, char *buf, int buflen,
* security_path hooks as a deleted dentry except without an inode
* allocated.
*/
if (d_unlinked(path->dentry) && path->dentry->d_inode &&
if (d_unlinked(path->dentry) && d_is_positive(path->dentry) &&
!(flags & PATH_MEDIATE_DELETED)) {
error = -ENOENT;
goto out;
}
/* If the path is not connected to the expected root,
* check if it is a sysctl and handle specially else remove any
* leading / that __d_path may have returned.
* Unless
* specifically directed to connect the path,
* OR
* if in a chroot and doing chroot relative paths and the path
* resolves to the namespace root (would be connected outside
* of chroot) and specifically directed to connect paths to
* namespace root.
*/
if (!connected) {
if (!(flags & PATH_CONNECT_PATH) &&
!(((flags & CHROOT_NSCONNECT) == CHROOT_NSCONNECT) &&
our_mnt(path->mnt))) {
/* disconnected path, don't return pathname starting
* with '/'
*/
error = -EACCES;
if (*res == '/')
*name = res + 1;
}
}
if (!connected)
error = disconnect(path, buf, name, flags, disconnected);
out:
return error;
}
/**
* get_name_to_buffer - get the pathname to a buffer ensure dir / is appended
* @path: path to get name for (NOT NULL)
* @flags: flags controlling path lookup
* @buffer: buffer to put name in (NOT NULL)
* @size: size of buffer
* @name: Returns - contains position of path name in @buffer (NOT NULL)
*
* Returns: %0 else error on failure
*/
static int get_name_to_buffer(struct path *path, int flags, char *buffer,
int size, char **name, const char **info)
{
int adjust = (flags & PATH_IS_DIR) ? 1 : 0;
int error = d_namespace_path(path, buffer, size - adjust, name, flags);
if (!error && (flags & PATH_IS_DIR) && (*name)[1] != '\0')
/*
* Append "/" to the pathname. The root directory is a special
* case; it already ends in slash.
*/
strcpy(&buffer[size - 2], "/");
if (info && error) {
if (error == -ENOENT)
*info = "Failed name lookup - deleted entry";
else if (error == -ESTALE)
*info = "Failed name lookup - disconnected path";
else if (error == -ENAMETOOLONG)
*info = "Failed name lookup - name too long";
else
*info = "Failed name lookup";
}
/*
* Append "/" to the pathname. The root directory is a special
* case; it already ends in slash.
*/
if (!error && isdir && ((*name)[1] != '\0' || (*name)[0] != '/'))
strcpy(&buf[aa_g_path_max - 2], "/");
return error;
}
/**
* aa_path_name - compute the pathname of a file
* aa_path_name - get the pathname to a buffer ensure dir / is appended
* @path: path the file (NOT NULL)
* @flags: flags controlling path name generation
* @buffer: buffer that aa_get_name() allocated (NOT NULL)
* @buffer: buffer to put name in (NOT NULL)
* @name: Returns - the generated path name if !error (NOT NULL)
* @info: Returns - information on why the path lookup failed (MAYBE NULL)
* @disconnected: string to prepend to disconnected paths
*
* @name is a pointer to the beginning of the pathname (which usually differs
* from the beginning of the buffer), or NULL. If there is an error @name
@@ -204,33 +198,24 @@ static int get_name_to_buffer(struct path *path, int flags, char *buffer,
*
* Returns: %0 else error code if could retrieve name
*/
int aa_path_name(struct path *path, int flags, char **buffer, const char **name,
const char **info)
int aa_path_name(struct path *path, int flags, char *buffer, const char **name,
const char **info, const char *disconnected)
{
char *buf, *str = NULL;
int size = 256;
int error;
char *str = NULL;
int error = d_namespace_path(path, buffer, &str, flags, disconnected);
*name = NULL;
*buffer = NULL;
for (;;) {
/* freed by caller */
buf = kmalloc(size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
error = get_name_to_buffer(path, flags, buf, size, &str, info);
if (error != -ENAMETOOLONG)
break;
kfree(buf);
size <<= 1;
if (size > aa_g_path_max)
return -ENAMETOOLONG;
*info = NULL;
if (info && error) {
if (error == -ENOENT)
*info = "Failed name lookup - deleted entry";
else if (error == -EACCES)
*info = "Failed name lookup - disconnected path";
else if (error == -ENAMETOOLONG)
*info = "Failed name lookup - name too long";
else
*info = "Failed name lookup";
}
*buffer = buf;
*name = str;
*name = str;
return error;
}