The patch titled
user namespace: remove exceptions for initial namespace
has been removed from the -mm tree. Its filename was
user_ns-handle-file-sigio-fix-2.patch
This patch was dropped because it was folded into user_ns-handle-file-sigio.patch
------------------------------------------------------
Subject: user namespace: remove exceptions for initial namespace
From: Serge E. Hallyn <serue@xxxxxxxxxx>
Both sigio and file access checks for user namespace equivalence were being
skipped for processes in the initial namespace. Remove these exceptions,
enforcing the same cross-namespace checks for all processes in all user
namespaces.
Signed-off-by: Serge E. Hallyn <serue@xxxxxxxxxx>
Cc: Serge E. Hallyn <serue@xxxxxxxxxx>
Cc: Herbert Poetzl <herbert@xxxxxxxxxxxx>
Cc: Kirill Korotaev <dev@xxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
fs/fcntl.c | 3 +--
include/linux/sched.h | 4 +---
2 files changed, 2 insertions(+), 5 deletions(-)
diff -puN fs/fcntl.c~user_ns-handle-file-sigio-fix-2 fs/fcntl.c
--- a/fs/fcntl.c~user_ns-handle-file-sigio-fix-2
+++ a/fs/fcntl.c
@@ -460,8 +460,7 @@ static const long band_table[NSIGPOLL] =
static inline int sigio_perm(struct task_struct *p,
struct fown_struct *fown, int sig)
{
- if (fown->user_ns != init_task.nsproxy->user_ns &&
- fown->user_ns != p->nsproxy->user_ns)
+ if (fown->user_ns != p->nsproxy->user_ns)
return 0;
return (((fown->euid == 0) ||
(fown->euid == p->suid) || (fown->euid == p->uid) ||
diff -puN include/linux/sched.h~user_ns-handle-file-sigio-fix-2 include/linux/sched.h
--- a/include/linux/sched.h~user_ns-handle-file-sigio-fix-2
+++ a/include/linux/sched.h
@@ -1609,12 +1609,10 @@ extern int cond_resched_softirq(void);
static inline int task_mnt_same_uidns(struct task_struct *tsk,
struct vfsmount *mnt)
{
- if (tsk->nsproxy == init_task.nsproxy)
+ if (mnt->mnt_user_ns == tsk->nsproxy->user_ns)
return 1;
if (mnt->mnt_flags & MNT_SHARE_NS)
return 1;
- if (mnt->mnt_user_ns == tsk->nsproxy->user_ns)
- return 1;
return 0;
}
#else
_
Patches currently in -mm which might be from serue@xxxxxxxxxx are
implement-file-posix-capabilities.patch
file-capabilities-dont-do-file-caps-if-mnt_nosuid.patch
file-capabilities-honor-secure_noroot.patch
introduce-and-use-get_task_mnt_ns.patch
nsproxy-externalizes-exit_task_namespaces.patch
user-namespace-add-the-framework.patch
user-ns-add-user_namespace-ptr-to-vfsmount.patch
user-ns-hook-permission.patch
user-ns-prepare-copy_tree-copy_mnt-and-their-callers-to-handle-errs.patch
user-ns-implement-shared-mounts.patch
user_ns-handle-file-sigio.patch
user_ns-handle-file-sigio-fix-2.patch
user-ns-implement-user-ns-unshare.patch
user-ns-implement-user-ns-unshare-tidy.patch
rename-attach_pid-to-find_attach_pid.patch
attach_pid-with-struct-pid-parameter.patch
remove-find_attach_pid.patch
statically-initialize-struct-pid-for-swapper.patch
explicitly-set-pgid-sid-of-init.patch
uts-namespace-remove-config_uts_ns.patch
ipc-namespace-remove-config_ipc_ns.patch
ipc-namespace-remove-config_ipc_ns-linkage-fix.patch
ipc-namespace-remove-config_ipc_ns-linkage-fix-fix.patch
integrity-service-api-and-dummy-provider-fix.patch
sysctl-move-utsname-sysctls-to-their-own-file.patch
sysctl-move-sysv-ipc-sysctls-to-their-own-file.patch
-
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