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

[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-GEFAQzZX7r8dnm+yROfE0A@public.gmane.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

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[PATCH 2/4] prctl.2: Note PR_SET_MM opts appeared in Linux 3.5

[Kir Kolyshkin]

Signed-off-by: Kir Kolyshkin <kir-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>
---
 man2/prctl.2 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/man2/prctl.2 b/man2/prctl.2
index db8174a..55aef52 100644
--- a/man2/prctl.2
+++ b/man2/prctl.2
@@ -711,6 +711,8 @@ value.
 The requirements for the address are the same as for the
 .BR PR_SET_MM_START_BRK
 option.
+.P
+The following options are available since Linux 3.5.
 .TP
 .BR PR_SET_MM_ARG_START
 Set the address above which the program command line is placed.
-- 
1.8.1.4

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[PATCH 3/4] prctl.2: fix wording in PR_SET_MM_EXE_FILE description

[Kir Kolyshkin]

Signed-off-by: Kir Kolyshkin <kir-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>
---
 man2/prctl.2 | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/man2/prctl.2 b/man2/prctl.2
index 55aef52..a2d06d1 100644
--- a/man2/prctl.2
+++ b/man2/prctl.2
@@ -769,8 +769,8 @@ section).
 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.
+This should help system administrators monitor unusual
+symbolic-link transitions over all processes running on a system.
 .RE
 .\"
 .SH RETURN VALUE
-- 
1.8.1.4

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[PATCH 4/4] prctl.2: cite PR_SET_MM kernel commits

[Kir Kolyshkin]

Signed-off-by: Kir Kolyshkin <kir-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>
---
 man2/prctl.2 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/man2/prctl.2 b/man2/prctl.2
index a2d06d1..4c7e9a7 100644
--- a/man2/prctl.2
+++ b/man2/prctl.2
@@ -642,6 +642,7 @@ All unused
 arguments must be zero.
 .TP
 .BR PR_SET_MM " (since Linux 3.3)"
+.\" commit 028ee4be34a09a6d48bdf30ab991ae933a7bc036
 Modify certain kernel memory map descriptor fields
 of the calling process.
 Usually these fields are set by the kernel and dynamic loader (see
@@ -713,6 +714,7 @@ The requirements for the address are the same as for the
 option.
 .P
 The following options are available since Linux 3.5.
+.\" commit fe8c7f5cbf91124987106faa3bdf0c8b955c4cf7
 .TP
 .BR PR_SET_MM_ARG_START
 Set the address above which the program command line is placed.
@@ -749,6 +751,7 @@ The
 is the size of the vector.
 .TP
 .BR PR_SET_MM_EXE_FILE
+.\" commit b32dfe377102ce668775f8b6b1461f7ad428f8b6
 Supersede the
 .IR /proc/pid/exe
 symbolic link with a new one pointing to a new executable file
-- 
1.8.1.4

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

[Michael Kerrisk (man-pages)]

On 02/13/2014 01:49 AM, Kir Kolyshkin wrote:
> 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.

Hello Kir,

Thanks for attending to this. I've applied all four of your patches.

Cheers,

Michael


> Signed-off-by: Kir Kolyshkin <kir-GEFAQzZX7r8dnm+yROfE0A@public.gmane.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
> 


-- 
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Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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Re: [PATCH 2/4] prctl.2: Note PR_SET_MM opts appeared in Linux 3.5

[Michael Kerrisk (man-pages)]

Applied!

On 02/13/2014 01:49 AM, Kir Kolyshkin wrote:
> Signed-off-by: Kir Kolyshkin <kir-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>
> ---
>  man2/prctl.2 | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/man2/prctl.2 b/man2/prctl.2
> index db8174a..55aef52 100644
> --- a/man2/prctl.2
> +++ b/man2/prctl.2
> @@ -711,6 +711,8 @@ value.
>  The requirements for the address are the same as for the
>  .BR PR_SET_MM_START_BRK
>  option.
> +.P
> +The following options are available since Linux 3.5.
>  .TP
>  .BR PR_SET_MM_ARG_START
>  Set the address above which the program command line is placed.
> 


-- 
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Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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Re: [PATCH 3/4] prctl.2: fix wording in PR_SET_MM_EXE_FILE description

[Michael Kerrisk (man-pages)]

Applied!

On 02/13/2014 01:49 AM, Kir Kolyshkin wrote:
> Signed-off-by: Kir Kolyshkin <kir-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>
> ---
>  man2/prctl.2 | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/man2/prctl.2 b/man2/prctl.2
> index 55aef52..a2d06d1 100644
> --- a/man2/prctl.2
> +++ b/man2/prctl.2
> @@ -769,8 +769,8 @@ section).
>  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.
> +This should help system administrators monitor unusual
> +symbolic-link transitions over all processes running on a system.
>  .RE
>  .\"
>  .SH RETURN VALUE
> 


-- 
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Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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Re: [PATCH 4/4] prctl.2: cite PR_SET_MM kernel commits

[Michael Kerrisk (man-pages)]

Applied!

On 02/13/2014 01:49 AM, Kir Kolyshkin wrote:
> Signed-off-by: Kir Kolyshkin <kir-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>
> ---
>  man2/prctl.2 | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/man2/prctl.2 b/man2/prctl.2
> index a2d06d1..4c7e9a7 100644
> --- a/man2/prctl.2
> +++ b/man2/prctl.2
> @@ -642,6 +642,7 @@ All unused
>  arguments must be zero.
>  .TP
>  .BR PR_SET_MM " (since Linux 3.3)"
> +.\" commit 028ee4be34a09a6d48bdf30ab991ae933a7bc036
>  Modify certain kernel memory map descriptor fields
>  of the calling process.
>  Usually these fields are set by the kernel and dynamic loader (see
> @@ -713,6 +714,7 @@ The requirements for the address are the same as for the
>  option.
>  .P
>  The following options are available since Linux 3.5.
> +.\" commit fe8c7f5cbf91124987106faa3bdf0c8b955c4cf7
>  .TP
>  .BR PR_SET_MM_ARG_START
>  Set the address above which the program command line is placed.
> @@ -749,6 +751,7 @@ The
>  is the size of the vector.
>  .TP
>  .BR PR_SET_MM_EXE_FILE
> +.\" commit b32dfe377102ce668775f8b6b1461f7ad428f8b6
>  Supersede the
>  .IR /proc/pid/exe
>  symbolic link with a new one pointing to a new executable file
> 


-- 
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Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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