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Message-Id: <1330518197-12825-2-git-send-email-gorcunov@openvz.org> Date: Wed, 29 Feb 2012 16:23:16 +0400 From: Cyrill Gorcunov <gorcunov@...nvz.org> To: Michael Kerrisk <mtk.manpages@...il.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, Pavel Emelyanov <xemul@...allels.com>, linux-man@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>, Cyrill Gorcunov <gorcunov@...nvz.org>, Tejun Heo <tj@...nel.org> Subject: [PATCH 1/2] prctl: Add PR_SET_MM option description Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org> CC: Tejun Heo <tj@...nel.org> CC: Pavel Emelyanov <xemul@...allels.com> --- man2/prctl.2 | 104 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 104 insertions(+), 0 deletions(-) diff --git a/man2/prctl.2 b/man2/prctl.2 index effad2a..4d6244f 100644 --- a/man2/prctl.2 +++ b/man2/prctl.2 @@ -378,6 +378,110 @@ Return the current per-process machine check kill policy. All unused .BR prctl () arguments must be zero. +.TP +.BR PR_SET_MM " (since Linux 3.3)" +Allows a user to modify certain kernel memory map descriptor fields +of the calling process. +Usually these fields are set by the kernel and dynamic loader (see +.BR ld.so (8) +for more information) and a regular application should not use this feature. +Still there are cases such as self-modifying programs, where a program might +find it useful to change its own memory map. +The kernel must be built with +.BR CONFIG_CHECKPOINT_RESTORE +option turned on, otherwise this feature will not be accessible +from a user space level. +The calling process must have +.BR CAP_SYS_ADMIN +(see +.BR capabilities (7) +for details) capability granted. +The value in +.I arg2 +is one of the options below, while +.I arg3 +provides a new value for this option. + +.BR PR_SET_MM_START_CODE +to set the address above which program text can run. +The corresponding memory area must be readable and executable, +but not writable or shareable (see +.BR mprotect (2) +and +.BR mmap (2) +for more information). + +.BR PR_SET_MM_END_CODE +to set the address below which program text can run. +The corresponding memory area must be readable and executable, +but not writable or shareable. + +.BR PR_SET_MM_START_DATA +to set the address above which program data+bss is placed. +The corresponding memory area must be readable and writable, +but not executable or shareable. + +.B PR_SET_MM_END_DATA +to set the address below which program data+bss is placed. +The corresponding memory area must be readable and writable, +but not executable or shareable. + +.BR PR_SET_MM_START_STACK +to set the start address of the stack. +The corresponding memory area must be readable and writable. + +.BR PR_SET_MM_START_BRK +to set the address above which program heap can be expanded with +.BR brk (2) +call. +The address must not be greater than ending address of +the current program data segment, neither it may exceed +resource limit for data (see +.BR setrlimit (2) +for more information). + +.BR PR_SET_MM_BRK +to set the current +.BR brk (2) +value. +The requirements for address are the same as for +.BR PR_SET_MM_START_BRK +option. + +.BR PR_SET_MM_ARG_START +to set the address above which program command line is placed. + +.BR PR_SET_MM_ARG_END +to set the address below which program command line is placed. + +.BR PR_SET_MM_ENV_START +to set the address above which program environment is placed. + +.BR PR_SET_MM_ENV_END +to set the address below which program environment is placed. + +The address passed with +.BR PR_SET_MM_ARG_START , +.BR PR_SET_MM_ARG_END , +.BR PR_SET_MM_ENV_START , +.BR PR_SET_MM_ENV_END , +should belong to a process stack area, thus corresponding memory area +must be readable, writable and (depending on the kernel +configuration) has +.BR MAP_GROWSDOWN +attribute set (see +.BR mmap (2) +for details). + +.BR PR_SET_MM_AUXV +to set a new auxiliary vector. +The +.I arg3 +argument should provide the address of the vector. +The +.I arg4 +is the size of the vector. +.\" .SH "RETURN VALUE" On success, .BR PR_GET_DUMPABLE , -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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