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-----BEGIN PGP SIGNATURE----- iQJIBAABCAAyFiEES0KozwfymdVUl37v6iDy2pc3iXMFAmXwt3cUHHBhdWxAcGF1 bC1tb29yZS5jb20ACgkQ6iDy2pc3iXObOhAAqldn1nbYS/t1D/k/9ZN/PtSQetK4 S58D8+gB59Sg0daWFaRhCwwShIbXS/6XzhqaVb3iAPptJs0YDFMbWLAW2d+dd69K /7C8diguHbuJdEnCJtFYQIVinavaYVRlyoQcO8uwTz8uvTgXPOhr2P9NcOApJXcR xqttuADVo/9Zn0O9/+GUPCH0ROL0SMnuUjwdVP3bpPHj9zEk8F1/A6chzTeSLJru Y4+cRrN/r0JTkvRqPdnF9LSvxK7mtAEaHkKGeLQbw0O5pv3r3w0EWMJvq+uonGU2 WX0eR5VMfevkFMUdw8FKOTa+OZ0HJ2KKIb4sB4wDMgeGyov7Z6SxgvFeQiSyD3aB QnyfLDzeEuPfousxUd45dUDnsWNnSgFF+JAdi0LSzm5hMuLeQDozTsFmh0orQcX1 L5A6VtAbSPP0ffl+tuPi48q3P3LlSjMP0B8W20NXFYhXukKXCgXVMr/dEvpwpu1m o1glviGIXeLQQSnX3lMWb7Ds2igmCtXPrqkdu2vpRhMp0od6n4R4jH73Aj5MeSQn n3sP73dg5sAaMjtI2NOisMeFUp09MMlOumCCM+AIplPXremm1kwgKRTIp0rKsLW9 VoQPXa43LQc3hAgPrpGuE+4yBfaBUq7Z8I37IFER/2y4K8b9YkduW4kDh7OdRz+d iQ4Nnu2lR/+CCH0= =0mTM -----END PGP SIGNATURE----- Merge tag 'lsm-pr-20240312' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm Pull lsm updates from Paul Moore: - Promote IMA/EVM to a proper LSM This is the bulk of the diffstat, and the source of all the changes in the VFS code. Prior to the start of the LSM stacking work it was important that IMA/EVM were separate from the rest of the LSMs, complete with their own hooks, infrastructure, etc. as it was the only way to enable IMA/EVM at the same time as a LSM. However, now that the bulk of the LSM infrastructure supports multiple simultaneous LSMs, we can simplify things greatly by bringing IMA/EVM into the LSM infrastructure as proper LSMs. This is something I've wanted to see happen for quite some time and Roberto was kind enough to put in the work to make it happen. - Use the LSM hook default values to simplify the call_int_hook() macro Previously the call_int_hook() macro required callers to supply a default return value, despite a default value being specified when the LSM hook was defined. This simplifies the macro by using the defined default return value which makes life easier for callers and should also reduce the number of return value bugs in the future (we've had a few pop up recently, hence this work). - Use the KMEM_CACHE() macro instead of kmem_cache_create() The guidance appears to be to use the KMEM_CACHE() macro when possible and there is no reason why we can't use the macro, so let's use it. - Fix a number of comment typos in the LSM hook comment blocks Not much to say here, we fixed some questionable grammar decisions in the LSM hook comment blocks. * tag 'lsm-pr-20240312' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm: (28 commits) cred: Use KMEM_CACHE() instead of kmem_cache_create() lsm: use default hook return value in call_int_hook() lsm: fix typos in security/security.c comment headers integrity: Remove LSM ima: Make it independent from 'integrity' LSM evm: Make it independent from 'integrity' LSM evm: Move to LSM infrastructure ima: Move IMA-Appraisal to LSM infrastructure ima: Move to LSM infrastructure integrity: Move integrity_kernel_module_request() to IMA security: Introduce key_post_create_or_update hook security: Introduce inode_post_remove_acl hook security: Introduce inode_post_set_acl hook security: Introduce inode_post_create_tmpfile hook security: Introduce path_post_mknod hook security: Introduce file_release hook security: Introduce file_post_open hook security: Introduce inode_post_removexattr hook security: Introduce inode_post_setattr hook security: Align inode_setattr hook definition with EVM ...
509 lines
15 KiB
C
509 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/attr.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* changes by Thomas Schoebel-Theuer
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*/
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#include <linux/export.h>
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#include <linux/time.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/sched/signal.h>
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#include <linux/capability.h>
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#include <linux/fsnotify.h>
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#include <linux/fcntl.h>
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#include <linux/filelock.h>
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#include <linux/security.h>
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#include "internal.h"
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/**
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* setattr_should_drop_sgid - determine whether the setgid bit needs to be
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* removed
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* @idmap: idmap of the mount @inode was found from
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* @inode: inode to check
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*
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* This function determines whether the setgid bit needs to be removed.
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* We retain backwards compatibility and require setgid bit to be removed
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* unconditionally if S_IXGRP is set. Otherwise we have the exact same
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* requirements as setattr_prepare() and setattr_copy().
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*
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* Return: ATTR_KILL_SGID if setgid bit needs to be removed, 0 otherwise.
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*/
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int setattr_should_drop_sgid(struct mnt_idmap *idmap,
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const struct inode *inode)
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{
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umode_t mode = inode->i_mode;
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if (!(mode & S_ISGID))
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return 0;
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if (mode & S_IXGRP)
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return ATTR_KILL_SGID;
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if (!in_group_or_capable(idmap, inode, i_gid_into_vfsgid(idmap, inode)))
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return ATTR_KILL_SGID;
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return 0;
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}
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EXPORT_SYMBOL(setattr_should_drop_sgid);
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/**
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* setattr_should_drop_suidgid - determine whether the set{g,u}id bit needs to
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* be dropped
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* @idmap: idmap of the mount @inode was found from
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* @inode: inode to check
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*
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* This function determines whether the set{g,u}id bits need to be removed.
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* If the setuid bit needs to be removed ATTR_KILL_SUID is returned. If the
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* setgid bit needs to be removed ATTR_KILL_SGID is returned. If both
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* set{g,u}id bits need to be removed the corresponding mask of both flags is
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* returned.
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*
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* Return: A mask of ATTR_KILL_S{G,U}ID indicating which - if any - setid bits
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* to remove, 0 otherwise.
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*/
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int setattr_should_drop_suidgid(struct mnt_idmap *idmap,
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struct inode *inode)
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{
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umode_t mode = inode->i_mode;
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int kill = 0;
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/* suid always must be killed */
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if (unlikely(mode & S_ISUID))
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kill = ATTR_KILL_SUID;
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kill |= setattr_should_drop_sgid(idmap, inode);
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if (unlikely(kill && !capable(CAP_FSETID) && S_ISREG(mode)))
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return kill;
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return 0;
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}
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EXPORT_SYMBOL(setattr_should_drop_suidgid);
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/**
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* chown_ok - verify permissions to chown inode
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* @idmap: idmap of the mount @inode was found from
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* @inode: inode to check permissions on
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* @ia_vfsuid: uid to chown @inode to
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*
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* If the inode has been found through an idmapped mount the idmap of
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* the vfsmount must be passed through @idmap. This function will then
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* take care to map the inode according to @idmap before checking
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* permissions. On non-idmapped mounts or if permission checking is to be
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* performed on the raw inode simply pass @nop_mnt_idmap.
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*/
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static bool chown_ok(struct mnt_idmap *idmap,
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const struct inode *inode, vfsuid_t ia_vfsuid)
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{
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vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode);
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if (vfsuid_eq_kuid(vfsuid, current_fsuid()) &&
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vfsuid_eq(ia_vfsuid, vfsuid))
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return true;
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if (capable_wrt_inode_uidgid(idmap, inode, CAP_CHOWN))
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return true;
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if (!vfsuid_valid(vfsuid) &&
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ns_capable(inode->i_sb->s_user_ns, CAP_CHOWN))
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return true;
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return false;
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}
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/**
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* chgrp_ok - verify permissions to chgrp inode
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* @idmap: idmap of the mount @inode was found from
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* @inode: inode to check permissions on
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* @ia_vfsgid: gid to chown @inode to
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*
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* If the inode has been found through an idmapped mount the idmap of
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* the vfsmount must be passed through @idmap. This function will then
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* take care to map the inode according to @idmap before checking
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* permissions. On non-idmapped mounts or if permission checking is to be
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* performed on the raw inode simply pass @nop_mnt_idmap.
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*/
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static bool chgrp_ok(struct mnt_idmap *idmap,
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const struct inode *inode, vfsgid_t ia_vfsgid)
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{
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vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode);
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vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode);
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if (vfsuid_eq_kuid(vfsuid, current_fsuid())) {
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if (vfsgid_eq(ia_vfsgid, vfsgid))
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return true;
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if (vfsgid_in_group_p(ia_vfsgid))
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return true;
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}
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if (capable_wrt_inode_uidgid(idmap, inode, CAP_CHOWN))
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return true;
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if (!vfsgid_valid(vfsgid) &&
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ns_capable(inode->i_sb->s_user_ns, CAP_CHOWN))
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return true;
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return false;
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}
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/**
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* setattr_prepare - check if attribute changes to a dentry are allowed
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* @idmap: idmap of the mount the inode was found from
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* @dentry: dentry to check
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* @attr: attributes to change
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*
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* Check if we are allowed to change the attributes contained in @attr
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* in the given dentry. This includes the normal unix access permission
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* checks, as well as checks for rlimits and others. The function also clears
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* SGID bit from mode if user is not allowed to set it. Also file capabilities
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* and IMA extended attributes are cleared if ATTR_KILL_PRIV is set.
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*
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* If the inode has been found through an idmapped mount the idmap of
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* the vfsmount must be passed through @idmap. This function will then
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* take care to map the inode according to @idmap before checking
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* permissions. On non-idmapped mounts or if permission checking is to be
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* performed on the raw inode simply pass @nop_mnt_idmap.
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*
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* Should be called as the first thing in ->setattr implementations,
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* possibly after taking additional locks.
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*/
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int setattr_prepare(struct mnt_idmap *idmap, struct dentry *dentry,
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struct iattr *attr)
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{
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struct inode *inode = d_inode(dentry);
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unsigned int ia_valid = attr->ia_valid;
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/*
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* First check size constraints. These can't be overriden using
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* ATTR_FORCE.
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*/
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if (ia_valid & ATTR_SIZE) {
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int error = inode_newsize_ok(inode, attr->ia_size);
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if (error)
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return error;
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}
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/* If force is set do it anyway. */
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if (ia_valid & ATTR_FORCE)
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goto kill_priv;
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/* Make sure a caller can chown. */
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if ((ia_valid & ATTR_UID) &&
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!chown_ok(idmap, inode, attr->ia_vfsuid))
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return -EPERM;
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/* Make sure caller can chgrp. */
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if ((ia_valid & ATTR_GID) &&
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!chgrp_ok(idmap, inode, attr->ia_vfsgid))
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return -EPERM;
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/* Make sure a caller can chmod. */
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if (ia_valid & ATTR_MODE) {
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vfsgid_t vfsgid;
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if (!inode_owner_or_capable(idmap, inode))
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return -EPERM;
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if (ia_valid & ATTR_GID)
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vfsgid = attr->ia_vfsgid;
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else
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vfsgid = i_gid_into_vfsgid(idmap, inode);
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/* Also check the setgid bit! */
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if (!in_group_or_capable(idmap, inode, vfsgid))
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attr->ia_mode &= ~S_ISGID;
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}
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/* Check for setting the inode time. */
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if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) {
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if (!inode_owner_or_capable(idmap, inode))
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return -EPERM;
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}
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kill_priv:
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/* User has permission for the change */
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if (ia_valid & ATTR_KILL_PRIV) {
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int error;
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error = security_inode_killpriv(idmap, dentry);
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if (error)
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return error;
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}
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return 0;
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}
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EXPORT_SYMBOL(setattr_prepare);
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/**
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* inode_newsize_ok - may this inode be truncated to a given size
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* @inode: the inode to be truncated
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* @offset: the new size to assign to the inode
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*
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* inode_newsize_ok must be called with i_mutex held.
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*
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* inode_newsize_ok will check filesystem limits and ulimits to check that the
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* new inode size is within limits. inode_newsize_ok will also send SIGXFSZ
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* when necessary. Caller must not proceed with inode size change if failure is
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* returned. @inode must be a file (not directory), with appropriate
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* permissions to allow truncate (inode_newsize_ok does NOT check these
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* conditions).
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*
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* Return: 0 on success, -ve errno on failure
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*/
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int inode_newsize_ok(const struct inode *inode, loff_t offset)
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{
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if (offset < 0)
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return -EINVAL;
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if (inode->i_size < offset) {
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unsigned long limit;
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limit = rlimit(RLIMIT_FSIZE);
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if (limit != RLIM_INFINITY && offset > limit)
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goto out_sig;
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if (offset > inode->i_sb->s_maxbytes)
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goto out_big;
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} else {
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/*
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* truncation of in-use swapfiles is disallowed - it would
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* cause subsequent swapout to scribble on the now-freed
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* blocks.
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*/
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if (IS_SWAPFILE(inode))
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return -ETXTBSY;
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}
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return 0;
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out_sig:
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send_sig(SIGXFSZ, current, 0);
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out_big:
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return -EFBIG;
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}
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EXPORT_SYMBOL(inode_newsize_ok);
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/**
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* setattr_copy - copy simple metadata updates into the generic inode
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* @idmap: idmap of the mount the inode was found from
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* @inode: the inode to be updated
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* @attr: the new attributes
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*
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* setattr_copy must be called with i_mutex held.
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*
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* setattr_copy updates the inode's metadata with that specified
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* in attr on idmapped mounts. Necessary permission checks to determine
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* whether or not the S_ISGID property needs to be removed are performed with
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* the correct idmapped mount permission helpers.
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* Noticeably missing is inode size update, which is more complex
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* as it requires pagecache updates.
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*
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* If the inode has been found through an idmapped mount the idmap of
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* the vfsmount must be passed through @idmap. This function will then
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* take care to map the inode according to @idmap before checking
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* permissions. On non-idmapped mounts or if permission checking is to be
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* performed on the raw inode simply pass @nop_mnt_idmap.
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*
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* The inode is not marked as dirty after this operation. The rationale is
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* that for "simple" filesystems, the struct inode is the inode storage.
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* The caller is free to mark the inode dirty afterwards if needed.
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*/
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void setattr_copy(struct mnt_idmap *idmap, struct inode *inode,
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const struct iattr *attr)
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{
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unsigned int ia_valid = attr->ia_valid;
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i_uid_update(idmap, attr, inode);
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i_gid_update(idmap, attr, inode);
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if (ia_valid & ATTR_ATIME)
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inode_set_atime_to_ts(inode, attr->ia_atime);
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if (ia_valid & ATTR_MTIME)
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inode_set_mtime_to_ts(inode, attr->ia_mtime);
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if (ia_valid & ATTR_CTIME)
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inode_set_ctime_to_ts(inode, attr->ia_ctime);
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if (ia_valid & ATTR_MODE) {
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umode_t mode = attr->ia_mode;
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if (!in_group_or_capable(idmap, inode,
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i_gid_into_vfsgid(idmap, inode)))
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mode &= ~S_ISGID;
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inode->i_mode = mode;
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}
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}
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EXPORT_SYMBOL(setattr_copy);
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int may_setattr(struct mnt_idmap *idmap, struct inode *inode,
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unsigned int ia_valid)
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{
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int error;
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if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_TIMES_SET)) {
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if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
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return -EPERM;
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}
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/*
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* If utimes(2) and friends are called with times == NULL (or both
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* times are UTIME_NOW), then we need to check for write permission
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*/
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if (ia_valid & ATTR_TOUCH) {
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if (IS_IMMUTABLE(inode))
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return -EPERM;
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if (!inode_owner_or_capable(idmap, inode)) {
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error = inode_permission(idmap, inode, MAY_WRITE);
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if (error)
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return error;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL(may_setattr);
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/**
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* notify_change - modify attributes of a filesystem object
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* @idmap: idmap of the mount the inode was found from
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* @dentry: object affected
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* @attr: new attributes
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* @delegated_inode: returns inode, if the inode is delegated
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*
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* The caller must hold the i_mutex on the affected object.
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*
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* If notify_change discovers a delegation in need of breaking,
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* it will return -EWOULDBLOCK and return a reference to the inode in
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* delegated_inode. The caller should then break the delegation and
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* retry. Because breaking a delegation may take a long time, the
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* caller should drop the i_mutex before doing so.
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*
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* Alternatively, a caller may pass NULL for delegated_inode. This may
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* be appropriate for callers that expect the underlying filesystem not
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* to be NFS exported. Also, passing NULL is fine for callers holding
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* the file open for write, as there can be no conflicting delegation in
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* that case.
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*
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* If the inode has been found through an idmapped mount the idmap of
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* the vfsmount must be passed through @idmap. This function will then
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* take care to map the inode according to @idmap before checking
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* permissions. On non-idmapped mounts or if permission checking is to be
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* performed on the raw inode simply pass @nop_mnt_idmap.
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*/
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int notify_change(struct mnt_idmap *idmap, struct dentry *dentry,
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struct iattr *attr, struct inode **delegated_inode)
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{
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struct inode *inode = dentry->d_inode;
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umode_t mode = inode->i_mode;
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int error;
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struct timespec64 now;
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unsigned int ia_valid = attr->ia_valid;
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WARN_ON_ONCE(!inode_is_locked(inode));
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error = may_setattr(idmap, inode, ia_valid);
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if (error)
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return error;
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if ((ia_valid & ATTR_MODE)) {
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/*
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* Don't allow changing the mode of symlinks:
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*
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* (1) The vfs doesn't take the mode of symlinks into account
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* during permission checking.
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* (2) This has never worked correctly. Most major filesystems
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* did return EOPNOTSUPP due to interactions with POSIX ACLs
|
|
* but did still updated the mode of the symlink.
|
|
* This inconsistency led system call wrapper providers such
|
|
* as libc to block changing the mode of symlinks with
|
|
* EOPNOTSUPP already.
|
|
* (3) To even do this in the first place one would have to use
|
|
* specific file descriptors and quite some effort.
|
|
*/
|
|
if (S_ISLNK(inode->i_mode))
|
|
return -EOPNOTSUPP;
|
|
|
|
/* Flag setting protected by i_mutex */
|
|
if (is_sxid(attr->ia_mode))
|
|
inode->i_flags &= ~S_NOSEC;
|
|
}
|
|
|
|
now = current_time(inode);
|
|
|
|
attr->ia_ctime = now;
|
|
if (!(ia_valid & ATTR_ATIME_SET))
|
|
attr->ia_atime = now;
|
|
else
|
|
attr->ia_atime = timestamp_truncate(attr->ia_atime, inode);
|
|
if (!(ia_valid & ATTR_MTIME_SET))
|
|
attr->ia_mtime = now;
|
|
else
|
|
attr->ia_mtime = timestamp_truncate(attr->ia_mtime, inode);
|
|
|
|
if (ia_valid & ATTR_KILL_PRIV) {
|
|
error = security_inode_need_killpriv(dentry);
|
|
if (error < 0)
|
|
return error;
|
|
if (error == 0)
|
|
ia_valid = attr->ia_valid &= ~ATTR_KILL_PRIV;
|
|
}
|
|
|
|
/*
|
|
* We now pass ATTR_KILL_S*ID to the lower level setattr function so
|
|
* that the function has the ability to reinterpret a mode change
|
|
* that's due to these bits. This adds an implicit restriction that
|
|
* no function will ever call notify_change with both ATTR_MODE and
|
|
* ATTR_KILL_S*ID set.
|
|
*/
|
|
if ((ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID)) &&
|
|
(ia_valid & ATTR_MODE))
|
|
BUG();
|
|
|
|
if (ia_valid & ATTR_KILL_SUID) {
|
|
if (mode & S_ISUID) {
|
|
ia_valid = attr->ia_valid |= ATTR_MODE;
|
|
attr->ia_mode = (inode->i_mode & ~S_ISUID);
|
|
}
|
|
}
|
|
if (ia_valid & ATTR_KILL_SGID) {
|
|
if (mode & S_ISGID) {
|
|
if (!(ia_valid & ATTR_MODE)) {
|
|
ia_valid = attr->ia_valid |= ATTR_MODE;
|
|
attr->ia_mode = inode->i_mode;
|
|
}
|
|
attr->ia_mode &= ~S_ISGID;
|
|
}
|
|
}
|
|
if (!(attr->ia_valid & ~(ATTR_KILL_SUID | ATTR_KILL_SGID)))
|
|
return 0;
|
|
|
|
/*
|
|
* Verify that uid/gid changes are valid in the target
|
|
* namespace of the superblock.
|
|
*/
|
|
if (ia_valid & ATTR_UID &&
|
|
!vfsuid_has_fsmapping(idmap, inode->i_sb->s_user_ns,
|
|
attr->ia_vfsuid))
|
|
return -EOVERFLOW;
|
|
if (ia_valid & ATTR_GID &&
|
|
!vfsgid_has_fsmapping(idmap, inode->i_sb->s_user_ns,
|
|
attr->ia_vfsgid))
|
|
return -EOVERFLOW;
|
|
|
|
/* Don't allow modifications of files with invalid uids or
|
|
* gids unless those uids & gids are being made valid.
|
|
*/
|
|
if (!(ia_valid & ATTR_UID) &&
|
|
!vfsuid_valid(i_uid_into_vfsuid(idmap, inode)))
|
|
return -EOVERFLOW;
|
|
if (!(ia_valid & ATTR_GID) &&
|
|
!vfsgid_valid(i_gid_into_vfsgid(idmap, inode)))
|
|
return -EOVERFLOW;
|
|
|
|
error = security_inode_setattr(idmap, dentry, attr);
|
|
if (error)
|
|
return error;
|
|
error = try_break_deleg(inode, delegated_inode);
|
|
if (error)
|
|
return error;
|
|
|
|
if (inode->i_op->setattr)
|
|
error = inode->i_op->setattr(idmap, dentry, attr);
|
|
else
|
|
error = simple_setattr(idmap, dentry, attr);
|
|
|
|
if (!error) {
|
|
fsnotify_change(dentry, ia_valid);
|
|
security_inode_post_setattr(idmap, dentry, ia_valid);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL(notify_change);
|