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 Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ 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 -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html