The patch titled
Subject: kernel/sys.c: make prctl(PR_SET_MM) generally available
has been added to the -mm tree. Its filename is
kernel-sysc-make-prctlpr_set_mm-generally-available.patch
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From: Amnon Shiloh <u3557@xxxxxxxxxxxxxxxxxx>
Subject: kernel/sys.c: make prctl(PR_SET_MM) generally available
The purpose of this patch is to allow privileged processes to set
their own per-memory memory-region fields:
start_code, end_code, start_data, end_data, start_brk, brk,
start_stack, arg_start, arg_end, env_start, env_end.
This functionality is needed by any application or package that needs to
reconstruct Linux processes, that is, to start them in any way other than
by means of an "execve()" from an executable file. This includes:
1. Restoring processes from a checkpoint-file (by all potential
user-level checkpointing packages, not only CRIU's).
2. Restarting processes on another node after process migration.
3. Starting duplicated copies of a running process (for reliability
and high-availablity).
4. Starting a process from an executable format that is not supported
by Linux, thus requiring a "manual execve" by a user-level utility.
5. Similarly, starting a process from a networked and/or crypted
executable that, for confidentiality, licensing or other reasons,
may not be written to the local file-systems.
The code that does that was already included in the Linux kernel by the
CRIU group, in the form of "prctl(PR_SET_MM)", but prior to this was
enclosed within their private "#ifdef CONFIG_CHECKPOINT_RESTORE", which is
normally disabled. The patch removes those ifdefs.
Signed-off-by: Amnon Shiloh <u3557@xxxxxxxxxxxxxxxxxx>
Cc: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/sys.c | 10 ++--------
1 file changed, 2 insertions(+), 8 deletions(-)
diff -puN kernel/sys.c~kernel-sysc-make-prctlpr_set_mm-generally-available kernel/sys.c
--- a/kernel/sys.c~kernel-sysc-make-prctlpr_set_mm-generally-available
+++ a/kernel/sys.c
@@ -1790,7 +1790,6 @@ SYSCALL_DEFINE1(umask, int, mask)
return mask;
}
-#ifdef CONFIG_CHECKPOINT_RESTORE
static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
{
struct fd exe;
@@ -1984,17 +1983,12 @@ out:
return error;
}
+#ifdef CONFIG_CHECKPOINT_RESTORE
static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr)
{
return put_user(me->clear_child_tid, tid_addr);
}
-
-#else /* CONFIG_CHECKPOINT_RESTORE */
-static int prctl_set_mm(int opt, unsigned long addr,
- unsigned long arg4, unsigned long arg5)
-{
- return -EINVAL;
-}
+#else
static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr)
{
return -EINVAL;
_
Patches currently in -mm which might be from u3557@xxxxxxxxxxxxxxxxxx are
kernel-sysc-make-prctlpr_set_mm-generally-available.patch
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