The patch titled
Subject: c/r: fcntl: add F_GETOWNER_UIDS option
has been added to the -mm tree. Its filename is
c-r-fcntl-add-f_getowner_uids-option.patch
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------------------------------------------------------
From: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Subject: c/r: fcntl: add F_GETOWNER_UIDS option
When we restore file descriptors we would like them to look exactly as
they were at dumping time.
With help of fcntl it's almost possible, the missing snippet is file
owners UIDs.
To be able to read their values the F_GETOWNER_UIDS is introduced.
This option is valid iif CONFIG_CHECKPOINT_RESTORE is turned on, otherwise
returning -EINVAL.
Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Acked-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: "Serge E. Hallyn" <serge@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/fcntl.c | 29 +++++++++++++++++++++++++++++
include/asm-generic/fcntl.h | 4 ++++
security/selinux/hooks.c | 1 +
3 files changed, 34 insertions(+)
diff -puN fs/fcntl.c~c-r-fcntl-add-f_getowner_uids-option fs/fcntl.c
--- a/fs/fcntl.c~c-r-fcntl-add-f_getowner_uids-option
+++ a/fs/fcntl.c
@@ -20,6 +20,7 @@
#include <linux/signal.h>
#include <linux/rcupdate.h>
#include <linux/pid_namespace.h>
+#include <linux/user_namespace.h>
#include <asm/poll.h>
#include <asm/siginfo.h>
@@ -340,6 +341,31 @@ static int f_getown_ex(struct file *filp
return ret;
}
+#ifdef CONFIG_CHECKPOINT_RESTORE
+static int f_getowner_uids(struct file *filp, unsigned long arg)
+{
+ struct user_namespace *user_ns = current_user_ns();
+ uid_t * __user dst = (void * __user)arg;
+ uid_t src[2];
+ int err;
+
+ read_lock(&filp->f_owner.lock);
+ src[0] = from_kuid(user_ns, filp->f_owner.uid);
+ src[1] = from_kuid(user_ns, filp->f_owner.euid);
+ read_unlock(&filp->f_owner.lock);
+
+ err = put_user(src[0], &dst[0]);
+ err |= put_user(src[1], &dst[1]);
+
+ return err;
+}
+#else
+static int f_getowner_uids(struct file *filp, unsigned long arg)
+{
+ return -EINVAL;
+}
+#endif
+
static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
struct file *filp)
{
@@ -396,6 +422,9 @@ static long do_fcntl(int fd, unsigned in
case F_SETOWN_EX:
err = f_setown_ex(filp, arg);
break;
+ case F_GETOWNER_UIDS:
+ err = f_getowner_uids(filp, arg);
+ break;
case F_GETSIG:
err = filp->f_owner.signum;
break;
diff -puN include/asm-generic/fcntl.h~c-r-fcntl-add-f_getowner_uids-option include/asm-generic/fcntl.h
--- a/include/asm-generic/fcntl.h~c-r-fcntl-add-f_getowner_uids-option
+++ a/include/asm-generic/fcntl.h
@@ -120,6 +120,10 @@
#define F_GETOWN_EX 16
#endif
+#ifndef F_GETOWNER_UIDS
+#define F_GETOWNER_UIDS 17
+#endif
+
#define F_OWNER_TID 0
#define F_OWNER_PID 1
#define F_OWNER_PGRP 2
diff -puN security/selinux/hooks.c~c-r-fcntl-add-f_getowner_uids-option security/selinux/hooks.c
--- a/security/selinux/hooks.c~c-r-fcntl-add-f_getowner_uids-option
+++ a/security/selinux/hooks.c
@@ -3181,6 +3181,7 @@ static int selinux_file_fcntl(struct fil
case F_GETFL:
case F_GETOWN:
case F_GETSIG:
+ case F_GETOWNER_UIDS:
/* Just check FD__USE permission */
err = file_has_perm(cred, file, 0);
break;
_
Subject: Subject: c/r: fcntl: add F_GETOWNER_UIDS option
Patches currently in -mm which might be from gorcunov@xxxxxxxxxx are
origin.patch
linux-next.patch
c-r-prctl-add-ability-to-set-new-mm_struct-exe_file-update-after-mm-num_exe_file_vmas-removal.patch
c-r-prctl-add-ability-to-set-new-mm_struct-exe_file-add-minimal-address-test-to-pr_set_mm.patch
c-r-prctl-add-ability-to-get-clear_tid_address.patch
c-r-prctl-drop-vma-flags-test-on-pr_set_mm_-stack-data-assignment.patch
c-r-fcntl-add-f_getowner_uids-option.patch
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