Signed-off-by: Cyrill Gorcunov <[email protected]>
CC: Kees Cook <[email protected]>
CC: Andrew Morton <[email protected]>
CC: "Kirill A. Shutemov" <[email protected]>
CC: Calvin Owens <[email protected]>
CC: Alexey Dobriyan <[email protected]>
CC: Oleg Nesterov <[email protected]>
CC: "Eric W. Biederman" <[email protected]>
CC: Al Viro <[email protected]>
CC: Peter Feiner <[email protected]>
CC: Pavel Emelyanov <[email protected]>
---
Gentlemen, could you please take a look once time permit.
Which questions this text raises so I could add more info
here (how we use it in criu, ptrace_may_access guards?)
Documentation/filesystems/proc.txt | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
Index: linux-2.6.git/Documentation/filesystems/proc.txt
===================================================================
--- linux-2.6.git.orig/Documentation/filesystems/proc.txt
+++ linux-2.6.git/Documentation/filesystems/proc.txt
@@ -42,6 +42,7 @@ Table of Contents
3.6 /proc/<pid>/comm & /proc/<pid>/task/<tid>/comm
3.7 /proc/<pid>/task/<tid>/children - Information about task children
3.8 /proc/<pid>/fdinfo/<fd> - Information about opened file
+ 3.9 /proc/<pid>/map_files - Information about memory mapped files
4 Configuring procfs
4.1 Mount options
@@ -1763,6 +1764,28 @@ pair provide additional information part
with TIMER_ABSTIME option which will be shown in 'settime flags', but
'it_value'
still exhibits timer's remaining time.
+3.9 /proc/<pid>/map_files - Information about memory mapped files
+---------------------------------------------------------------------
+This directory consists of simbolic links which represent memory mapped files
+the process is carrying. A typical output is like the following
+
+ | lr-------- 1 root root 64 Jan 27 11:24 333c600000-333c620000 ->
/usr/lib64/ld-2.18.so
+ | lr-------- 1 root root 64 Jan 27 11:24 333c81f000-333c820000 ->
/usr/lib64/ld-2.18.so
+ | lr-------- 1 root root 64 Jan 27 11:24 333c820000-333c821000 ->
/usr/lib64/ld-2.18.so
+ | ...
+ | lr-------- 1 root root 64 Jan 27 11:24 35d0421000-35d0422000 ->
/usr/lib64/libselinux.so.1
+ | lr-------- 1 root root 64 Jan 27 11:24 400000-41a000 -> /usr/bin/ls
+
+The name of a link is virtual memory bounds a particular map exhibits, i.e.
+vm_area_struct::vm_start-vm_area_struct::vm_end.
+
+The main purpose of map_files directory is to be able to retrieve a set of
+memory mapped files in a fast way instead of parsing /proc/<pid>/maps or
+/proc/<pid>/smaps which contain a way more records. Same time one can open(2)
+mappings from the listings of two processes and comparing inodes figure out
+which anonymous memory areas are actually shared.
+
+
------------------------------------------------------------------------------
Configuring procfs
------------------------------------------------------------------------------
--
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