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Merge f30fabe78a ("Merge tag 'fs.idmapped.v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux") into android-mainline

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Steps on the way to 5.19-rc1

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I446d95b497c52867f9410bd7e85c049527caf0b4
This commit is contained in:
Greg Kroah-Hartman
2022-06-07 18:22:59 +02:00
parent b7ffc57a95 f30fabe78a
commit 9f17c4467d
2 changed files with 8 additions and 2 deletions
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5
Documentation/filesystems/idmappings.rst
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@@ -369,6 +369,11 @@ kernel maps the caller's userspace id down into a kernel id according to the
caller's idmapping and then maps that kernel id up according to the
filesystem's idmapping.
Let's see some examples with caller/filesystem idmapping but without mount
idmappings. This will exhibit some problems we can hit. After that we will
revisit/reconsider these examples, this time using mount idmappings, to see how
they can solve the problems we observed before.
Example 1
~~~~~~~~~

5
fs/namespace.c
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@@ -4026,8 +4026,9 @@ static int can_idmap_mount(const struct mount_kattr *kattr, struct mount *mnt)
static inline bool mnt_allow_writers(const struct mount_kattr *kattr,
const struct mount *mnt)
{
return !(kattr->attr_set & MNT_READONLY) ||
(mnt->mnt.mnt_flags & MNT_READONLY);
return (!(kattr->attr_set & MNT_READONLY) ||
(mnt->mnt.mnt_flags & MNT_READONLY)) &&
!kattr->mnt_userns;
}
static int mount_setattr_prepare(struct mount_kattr *kattr, struct mount *mnt)