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-rw-r--r--fs/attr.c8
-rw-r--r--fs/exec.c3
-rw-r--r--fs/inode.c3
-rw-r--r--fs/namei.c13
-rw-r--r--fs/overlayfs/super.c2
-rw-r--r--fs/posix_acl.c2
-rw-r--r--fs/xfs/xfs_ioctl.c2
-rw-r--r--include/linux/capability.h7
-rw-r--r--kernel/capability.c14
-rw-r--r--security/commoncap.c5
10 files changed, 36 insertions, 23 deletions
diff --git a/fs/attr.c b/fs/attr.c
index b4bbdbd4c8ca..d270f640a192 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -23,7 +23,7 @@ static bool chown_ok(const struct inode *inode, kuid_t uid)
if (uid_eq(current_fsuid(), inode->i_uid) &&
uid_eq(uid, inode->i_uid))
return true;
- if (capable_wrt_inode_uidgid(inode, CAP_CHOWN))
+ if (capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_CHOWN))
return true;
if (uid_eq(inode->i_uid, INVALID_UID) &&
ns_capable(inode->i_sb->s_user_ns, CAP_CHOWN))
@@ -36,7 +36,7 @@ static bool chgrp_ok(const struct inode *inode, kgid_t gid)
if (uid_eq(current_fsuid(), inode->i_uid) &&
(in_group_p(gid) || gid_eq(gid, inode->i_gid)))
return true;
- if (capable_wrt_inode_uidgid(inode, CAP_CHOWN))
+ if (capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_CHOWN))
return true;
if (gid_eq(inode->i_gid, INVALID_GID) &&
ns_capable(inode->i_sb->s_user_ns, CAP_CHOWN))
@@ -92,7 +92,7 @@ int setattr_prepare(struct dentry *dentry, struct iattr *attr)
/* Also check the setgid bit! */
if (!in_group_p((ia_valid & ATTR_GID) ? attr->ia_gid :
inode->i_gid) &&
- !capable_wrt_inode_uidgid(inode, CAP_FSETID))
+ !capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_FSETID))
attr->ia_mode &= ~S_ISGID;
}
@@ -193,7 +193,7 @@ void setattr_copy(struct inode *inode, const struct iattr *attr)
umode_t mode = attr->ia_mode;
if (!in_group_p(inode->i_gid) &&
- !capable_wrt_inode_uidgid(inode, CAP_FSETID))
+ !capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_FSETID))
mode &= ~S_ISGID;
inode->i_mode = mode;
}
diff --git a/fs/exec.c b/fs/exec.c
index 5d4d52039105..89d4780ff48f 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1411,7 +1411,8 @@ void would_dump(struct linux_binprm *bprm, struct file *file)
/* Ensure mm->user_ns contains the executable */
user_ns = old = bprm->mm->user_ns;
while ((user_ns != &init_user_ns) &&
- !privileged_wrt_inode_uidgid(user_ns, inode))
+ !privileged_wrt_inode_uidgid(user_ns, &init_user_ns,
+ inode))
user_ns = user_ns->parent;
if (old != user_ns) {
diff --git a/fs/inode.c b/fs/inode.c
index 6442d97d9a4a..cd40cbf87ce4 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -2146,7 +2146,8 @@ void inode_init_owner(struct inode *inode, const struct inode *dir,
mode |= S_ISGID;
else if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP) &&
!in_group_p(inode->i_gid) &&
- !capable_wrt_inode_uidgid(dir, CAP_FSETID))
+ !capable_wrt_inode_uidgid(&init_user_ns, dir,
+ CAP_FSETID))
mode &= ~S_ISGID;
} else
inode->i_gid = current_fsgid();
diff --git a/fs/namei.c b/fs/namei.c
index 78443a85480a..fd4724bce4f5 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -357,10 +357,11 @@ int generic_permission(struct inode *inode, int mask)
if (S_ISDIR(inode->i_mode)) {
/* DACs are overridable for directories */
if (!(mask & MAY_WRITE))
- if (capable_wrt_inode_uidgid(inode,
+ if (capable_wrt_inode_uidgid(&init_user_ns, inode,
CAP_DAC_READ_SEARCH))
return 0;
- if (capable_wrt_inode_uidgid(inode, CAP_DAC_OVERRIDE))
+ if (capable_wrt_inode_uidgid(&init_user_ns, inode,
+ CAP_DAC_OVERRIDE))
return 0;
return -EACCES;
}
@@ -370,7 +371,8 @@ int generic_permission(struct inode *inode, int mask)
*/
mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
if (mask == MAY_READ)
- if (capable_wrt_inode_uidgid(inode, CAP_DAC_READ_SEARCH))
+ if (capable_wrt_inode_uidgid(&init_user_ns, inode,
+ CAP_DAC_READ_SEARCH))
return 0;
/*
* Read/write DACs are always overridable.
@@ -378,7 +380,8 @@ int generic_permission(struct inode *inode, int mask)
* at least one exec bit set.
*/
if (!(mask & MAY_EXEC) || (inode->i_mode & S_IXUGO))
- if (capable_wrt_inode_uidgid(inode, CAP_DAC_OVERRIDE))
+ if (capable_wrt_inode_uidgid(&init_user_ns, inode,
+ CAP_DAC_OVERRIDE))
return 0;
return -EACCES;
@@ -2659,7 +2662,7 @@ int __check_sticky(struct inode *dir, struct inode *inode)
return 0;
if (uid_eq(dir->i_uid, fsuid))
return 0;
- return !capable_wrt_inode_uidgid(inode, CAP_FOWNER);
+ return !capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_FOWNER);
}
EXPORT_SYMBOL(__check_sticky);
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 2bd570cbe8a4..88d877787770 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1017,7 +1017,7 @@ ovl_posix_acl_xattr_set(const struct xattr_handler *handler,
if (unlikely(inode->i_mode & S_ISGID) &&
handler->flags == ACL_TYPE_ACCESS &&
!in_group_p(inode->i_gid) &&
- !capable_wrt_inode_uidgid(inode, CAP_FSETID)) {
+ !capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_FSETID)) {
struct iattr iattr = { .ia_valid = ATTR_KILL_SGID };
err = ovl_setattr(dentry, &iattr);
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 95882b3f5f62..4ca6d53c6f0a 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -656,7 +656,7 @@ int posix_acl_update_mode(struct inode *inode, umode_t *mode_p,
if (error == 0)
*acl = NULL;
if (!in_group_p(inode->i_gid) &&
- !capable_wrt_inode_uidgid(inode, CAP_FSETID))
+ !capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_FSETID))
mode &= ~S_ISGID;
*mode_p = mode;
return 0;
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 3fbd98f61ea5..97bd29fc8c43 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1502,7 +1502,7 @@ xfs_ioctl_setattr(
*/
if ((VFS_I(ip)->i_mode & (S_ISUID|S_ISGID)) &&
- !capable_wrt_inode_uidgid(VFS_I(ip), CAP_FSETID))
+ !capable_wrt_inode_uidgid(&init_user_ns, VFS_I(ip), CAP_FSETID))
VFS_I(ip)->i_mode &= ~(S_ISUID|S_ISGID);
/* Change the ownerships and register project quota modifications */
diff --git a/include/linux/capability.h b/include/linux/capability.h
index b2f698915c0f..62bfa3ed84d7 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -247,8 +247,11 @@ static inline bool ns_capable_setid(struct user_namespace *ns, int cap)
return true;
}
#endif /* CONFIG_MULTIUSER */
-extern bool privileged_wrt_inode_uidgid(struct user_namespace *ns, const struct inode *inode);
-extern bool capable_wrt_inode_uidgid(const struct inode *inode, int cap);
+bool privileged_wrt_inode_uidgid(struct user_namespace *ns,
+ struct user_namespace *mnt_userns,
+ const struct inode *inode);
+bool capable_wrt_inode_uidgid(struct user_namespace *mnt_userns,
+ const struct inode *inode, int cap);
extern bool file_ns_capable(const struct file *file, struct user_namespace *ns, int cap);
extern bool ptracer_capable(struct task_struct *tsk, struct user_namespace *ns);
static inline bool perfmon_capable(void)
diff --git a/kernel/capability.c b/kernel/capability.c
index de7eac903a2a..46a361dde042 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -484,10 +484,12 @@ EXPORT_SYMBOL(file_ns_capable);
*
* Return true if the inode uid and gid are within the namespace.
*/
-bool privileged_wrt_inode_uidgid(struct user_namespace *ns, const struct inode *inode)
+bool privileged_wrt_inode_uidgid(struct user_namespace *ns,
+ struct user_namespace *mnt_userns,
+ const struct inode *inode)
{
- return kuid_has_mapping(ns, inode->i_uid) &&
- kgid_has_mapping(ns, inode->i_gid);
+ return kuid_has_mapping(ns, i_uid_into_mnt(mnt_userns, inode)) &&
+ kgid_has_mapping(ns, i_gid_into_mnt(mnt_userns, inode));
}
/**
@@ -499,11 +501,13 @@ bool privileged_wrt_inode_uidgid(struct user_namespace *ns, const struct inode *
* its own user namespace and that the given inode's uid and gid are
* mapped into the current user namespace.
*/
-bool capable_wrt_inode_uidgid(const struct inode *inode, int cap)
+bool capable_wrt_inode_uidgid(struct user_namespace *mnt_userns,
+ const struct inode *inode, int cap)
{
struct user_namespace *ns = current_user_ns();
- return ns_capable(ns, cap) && privileged_wrt_inode_uidgid(ns, inode);
+ return ns_capable(ns, cap) &&
+ privileged_wrt_inode_uidgid(ns, mnt_userns, inode);
}
EXPORT_SYMBOL(capable_wrt_inode_uidgid);
diff --git a/security/commoncap.c b/security/commoncap.c
index bacc1111d871..88ee345f7bfa 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -489,7 +489,7 @@ int cap_convert_nscap(struct dentry *dentry, const void **ivalue, size_t size)
return -EINVAL;
if (!validheader(size, cap))
return -EINVAL;
- if (!capable_wrt_inode_uidgid(inode, CAP_SETFCAP))
+ if (!capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_SETFCAP))
return -EPERM;
if (size == XATTR_CAPS_SZ_2)
if (ns_capable(inode->i_sb->s_user_ns, CAP_SETFCAP))
@@ -956,7 +956,8 @@ int cap_inode_removexattr(struct dentry *dentry, const char *name)
struct inode *inode = d_backing_inode(dentry);
if (!inode)
return -EINVAL;
- if (!capable_wrt_inode_uidgid(inode, CAP_SETFCAP))
+ if (!capable_wrt_inode_uidgid(&init_user_ns, inode,
+ CAP_SETFCAP))
return -EPERM;
return 0;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.