[CRIU] [PATCH 1/4] prctl.2: uncomment PR_SET_MM options in Linux 3.5

[Kir Kolyshkin]

Some of the PR_SET_MM options were merged to vanilla kernel
later, and appeared in Linux 3.5. Those are:
 - PR_SET_MM_ARG_START
 - PR_SET_MM_ARG_END
 - PR_SET_MM_ENV_START
 - PR_SET_MM_ENV_END
 - PR_SET_MM_AUXV
 - PR_SET_MM_EXE_FILE

This patch merely uncomments description and error codes
for these options, which were present but commented out,
and removes the appropriate FIXME marks.

Signed-off-by: Kir Kolyshkin <kir at openvz.org>
---
 man2/prctl.2 | 186 +++++++++++++++++++++++++++++------------------------------
 1 file changed, 90 insertions(+), 96 deletions(-)

diff --git a/man2/prctl.2 b/man2/prctl.2
index 70636e5..db8174a 100644
--- a/man2/prctl.2
+++ b/man2/prctl.2
@@ -711,67 +711,64 @@ value.
 The requirements for the address are the same as for the
 .BR PR_SET_MM_START_BRK
 option.
-.\" FIXME The following (until ========) is not yet in mainline kernel,
-.\" so commented out for the moment.
-.\" .TP
-.\" .BR PR_SET_MM_ARG_START
-.\" Set the address above which the program command line is placed.
-.\" .TP
-.\" .BR PR_SET_MM_ARG_END
-.\" Set the address below which the program command line is placed.
-.\" .TP
-.\" .BR PR_SET_MM_ENV_START
-.\" Set the address above which the program environment is placed.
-.\" .TP
-.\" .BR PR_SET_MM_ENV_END
-.\" Set the address below which the program environment is placed.
-.\" .IP
-.\" The address passed with
-.\" .BR PR_SET_MM_ARG_START ,
-.\" .BR PR_SET_MM_ARG_END ,
-.\" .BR PR_SET_MM_ENV_START ,
-.\" and
-.\" .BR PR_SET_MM_ENV_END
-.\" should belong to a process stack area.
-.\" Thus, the corresponding memory area must be readable, writable, and
-.\" (depending on the kernel configuration) have the
-.\" .BR MAP_GROWSDOWN
-.\" attribute set (see
-.\" .BR mmap (2)).
-.\" .TP
-.\" .BR PR_SET_MM_AUXV
-.\" 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.
-.\" .TP
-.\" .BR PR_SET_MM_EXE_FILE
-.\" Supersede the
-.\" .IR /proc/pid/exe
-.\" symbolic link with a new one pointing to a new executable file
-.\" identified by the file descriptor provided in
-.\" .I arg3
-.\" argument.
-.\" The file descriptor should be obtained with a regular
-.\" .BR open (2)
-.\" call.
-.\" .IP
-.\" To change the symbolic link, one needs to unmap all existing
-.\" executable memory areas, including those created by the kernel itself
-.\" (for example the kernel usually creates at least one executable
-.\" memory area for the ELF
-.\" .IR \.text
-.\" section).
-.\" .IP
-.\" The second limitation is that such transitions can be done only once
-.\" in a process life time.
-.\" Any further attempts will be rejected.
-.\" This should help system administrators to monitor unusual
-.\" symbolic-link transitions over all process running in a system.
-.\" ========== END FIXME
+.TP
+.BR PR_SET_MM_ARG_START
+Set the address above which the program command line is placed.
+.TP
+.BR PR_SET_MM_ARG_END
+Set the address below which the program command line is placed.
+.TP
+.BR PR_SET_MM_ENV_START
+Set the address above which the program environment is placed.
+.TP
+.BR PR_SET_MM_ENV_END
+Set the address below which the program environment is placed.
+.IP
+The address passed with
+.BR PR_SET_MM_ARG_START ,
+.BR PR_SET_MM_ARG_END ,
+.BR PR_SET_MM_ENV_START ,
+and
+.BR PR_SET_MM_ENV_END
+should belong to a process stack area.
+Thus, the corresponding memory area must be readable, writable, and
+(depending on the kernel configuration) have the
+.BR MAP_GROWSDOWN
+attribute set (see
+.BR mmap (2)).
+.TP
+.BR PR_SET_MM_AUXV
+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.
+.TP
+.BR PR_SET_MM_EXE_FILE
+Supersede the
+.IR /proc/pid/exe
+symbolic link with a new one pointing to a new executable file
+identified by the file descriptor provided in
+.I arg3
+argument.
+The file descriptor should be obtained with a regular
+.BR open (2)
+call.
+.IP
+To change the symbolic link, one needs to unmap all existing
+executable memory areas, including those created by the kernel itself
+(for example the kernel usually creates at least one executable
+memory area for the ELF
+.IR \.text
+section).
+.IP
+The second limitation is that such transitions can be done only once
+in a process life time.
+Any further attempts will be rejected.
+This should help system administrators to monitor unusual
+symbolic-link transitions over all process running in a system.
 .RE
 .\"
 .SH RETURN VALUE
@@ -916,41 +913,38 @@ is
 and the caller does not have the
 .B CAP_SYS_RESOURCE
 capability.
-.\" FIXME The following (until ========) is not yet in mainline kernel,
-.\" so commented out for the moment.
-.\" .TP
-.\" .B EACCES
-.\" .I option
-.\" is
-.\" .BR PR_SET_MM ,
-.\" and
-.\" .I arg3
-.\" is
-.\" .BR PR_SET_MM_EXE_FILE ,
-.\" the file is not executable.
-.\" .TP
-.\" .B EBUSY
-.\" .I option
-.\" is
-.\" .BR PR_SET_MM ,
-.\" .I arg3
-.\" is
-.\" .BR PR_SET_MM_EXE_FILE ,
-.\" and this the second attempt to change the
-.\" .I /proc/pid/exe
-.\" symbolic link, which is prohibited.
-.\" .TP
-.\" .B EBADF
-.\" .I option
-.\" is
-.\" .BR PR_SET_MM ,
-.\" .I arg3
-.\" is
-.\" .BR PR_SET_MM_EXE_FILE ,
-.\" and the file descriptor passed in
-.\" .I arg4
-.\" is not valid.
-.\" ========== END FIXME
+.TP
+.B EACCES
+.I option
+is
+.BR PR_SET_MM ,
+and
+.I arg3
+is
+.BR PR_SET_MM_EXE_FILE ,
+the file is not executable.
+.TP
+.B EBUSY
+.I option
+is
+.BR PR_SET_MM ,
+.I arg3
+is
+.BR PR_SET_MM_EXE_FILE ,
+and this the second attempt to change the
+.I /proc/pid/exe
+symbolic link, which is prohibited.
+.TP
+.B EBADF
+.I option
+is
+.BR PR_SET_MM ,
+.I arg3
+is
+.BR PR_SET_MM_EXE_FILE ,
+and the file descriptor passed in
+.I arg4
+is not valid.
 .\" The following can't actually happen, because prctl() in
 .\" seccomp mode will cause SIGKILL.
 .\" .TP
-- 
1.8.1.4