The restriction to CAP_SYS_ADMIN was removed from map_files in 2015 [1]. There was a fixme that indicted this might happen, but the main text was never updated when this commit landed. While we're at it, add a note about the ptrace access check that is still required. [1] https://github.com/torvalds/linux/commit/bdb4d100afe9818aebd1d98ced575c5ef143456c Signed-off-by: Keno Fischer <keno@xxxxxxxxxxxxxxxxxx> --- man5/proc.5 | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/man5/proc.5 b/man5/proc.5 index 34cb957dd..0d6043c8f 100644 --- a/man5/proc.5 +++ b/man5/proc.5 @@ -1090,16 +1090,18 @@ lrw\-\-\-\-\-\-\-. 1 root root 64 Apr 16 21:33 .EE .in .IP -This directory appears only if the +Permission to access this file is governed by a ptrace access mode +.B PTRACE_MODE_READ_FSCREDS +check; see +.BR ptrace (2). +.IP +.\" This permissions check got removed in kernel commit bdb4d100a +Until kernel version 4.3, this directory appeared only if the .B CONFIG_CHECKPOINT_RESTORE -kernel configuration option is enabled. -Privilege +kernel configuration option was enabled. +Additionally, in those kernel versions, privilege .RB ( CAP_SYS_ADMIN ) -.\" FIXME -.\" This may change. See the mail thread -.\" "[RFC][PATCH v2] procfs: Always expose /proc/<pid>/map_files/ and make it readable" -.\" from Jan 2015 -is required to view the contents of this directory. +was required to view the contents of this directory. .TP .I /proc/[pid]/maps A file containing the currently mapped memory regions and their access -- 2.25.1
