| commit | 831830b5a2b5d413407adf380ef62fe17d6fcbf2 | |
| author | Al Viro <viro@ZenIV.linux.org.uk> | |
| Wed, 2 Jan 2008 14:09:57 +0000 (2 14:09 +0000) | ||
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | |
| Wed, 2 Jan 2008 21:13:27 +0000 (2 13:13 -0800) | ||
| tree | b08f54f15374b5b98b0b3bea20a1d2ea8d1f50e0 | treesnapshot (tar.gz zip) |
| parent | ac40532ef0b8649e6f7f83859ea0de1c4ed08a19 | commitdiff |
restrict reading from /proc/<pid>/maps to those who share ->mm or can ptrace pid
Contents of /proc/*/maps is sensitive and may become sensitive after
open() (e.g. if target originally shares our ->mm and later does exec
on suid-root binary).
Check at read() (actually, ->start() of iterator) time that mm_struct
we'd grabbed and locked is
- still the ->mm of target
- equal to reader's ->mm or the target is ptracable by reader.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Contents of /proc/*/maps is sensitive and may become sensitive after
open() (e.g. if target originally shares our ->mm and later does exec
on suid-root binary).
Check at read() (actually, ->start() of iterator) time that mm_struct
we'd grabbed and locked is
- still the ->mm of target
- equal to reader's ->mm or the target is ptracable by reader.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>