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vfs-6.14-rc6.fixes

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Merge tag 'vfs-6.14-rc6.fixes' of gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs

Pull vfs fixes from Christian Brauner:

 - Fix spelling mistakes in idmappings.rst

 - Fix RCU warnings in override_creds()/revert_creds()

 - Create new pid namespaces with default limit now that pid_max is
   namespaced

* tag 'vfs-6.14-rc6.fixes' of gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs:
  pid: Do not set pid_max in new pid namespaces
  doc: correcting two prefix errors in idmappings.rst
  cred: Fix RCU warnings in override/revert_creds
This commit is contained in:
Linus Torvalds 2025-03-06 08:04:49 -10:00
commit 7f0e9ee5e4
3 changed files with 5 additions and 11 deletions
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4
Documentation/filesystems/idmappings.rst
View file

@ -63,8 +63,8 @@ what id ``k11000`` corresponds to in the second or third idmapping. The
straightforward algorithm to use is to apply the inverse of the first idmapping,
mapping ``k11000`` up to ``u1000``. Afterwards, we can map ``u1000`` down using
either the second idmapping mapping or third idmapping mapping. The second
idmapping would map ``u1000`` down to ``21000``. The third idmapping would map
``u1000`` down to ``u31000``.
idmapping would map ``u1000`` down to ``k21000``. The third idmapping would map
``u1000`` down to ``k31000``.
If we were given the same task for the following three idmappings::

10
include/linux/cred.h
View file

@ -172,18 +172,12 @@ static inline bool cap_ambient_invariant_ok(const struct cred *cred)
static inline const struct cred *override_creds(const struct cred *override_cred)
{
const struct cred *old = current->cred;
rcu_assign_pointer(current->cred, override_cred);
return old;
return rcu_replace_pointer(current->cred, override_cred, 1);
}
static inline const struct cred *revert_creds(const struct cred *revert_cred)
{
const struct cred *override_cred = current->cred;
rcu_assign_pointer(current->cred, revert_cred);
return override_cred;
return rcu_replace_pointer(current->cred, revert_cred, 1);
}
/**

2
kernel/pid_namespace.c
View file

@ -107,7 +107,7 @@ static struct pid_namespace *create_pid_namespace(struct user_namespace *user_ns
goto out_free_idr;
ns->ns.ops = &pidns_operations;
ns->pid_max = parent_pid_ns->pid_max;
ns->pid_max = PID_MAX_LIMIT;
err = register_pidns_sysctls(ns);
if (err)
goto out_free_inum;