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Fix AppArmor profile docker-default /proc/sys rule 

The current docker-default AppArmor profile intends to block write
access to everything in `/proc`, except for `/proc/<pid>` and
`/proc/sys/kernel/shm*`.

Currently the rules block access to everything in `/proc/sys`, and do
not successfully allow access to `/proc/sys/kernel/shm*`. Specifically,
a path like /proc/sys/kernel/shmmax matches this part of the pattern:

    deny @{PROC}/{[^1-9][^0-9][^0-9][^0-9]*     }/** w,
         /proc  / s     y     s     /     kernel /shmmax

This patch updates the rule so that it works as intended.

Closes #39791

Signed-off-by: Phil Sphicas <phil.sphicas@att.com>
This commit is contained in:
Phil Sphicas 2019-08-24 13:28:36 -07:00 committed by Sebastiaan van Stijn
parent cceead243e
commit 66f14e4ae9
1 changed files with 1 additions and 1 deletions
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2
profiles/apparmor/template.go
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@ -35,7 +35,7 @@ profile {{.Name}} flags=(attach_disconnected,mediate_deleted) {
deny @{PROC}/* w, # deny write for all files directly in /proc (not in a subdir)
# deny write to files not in /proc/<number>/** or /proc/sys/**
deny @{PROC}/{[^1-9],[^1-9][^0-9],[^1-9s][^0-9y][^0-9s],[^1-9][^0-9][^0-9][^0-9]*}/** w,
deny @{PROC}/{[^1-9],[^1-9][^0-9],[^1-9s][^0-9y][^0-9s],[^1-9][^0-9][^0-9][^0-9/]*}/** w,
deny @{PROC}/sys/[^k]** w, # deny /proc/sys except /proc/sys/k* (effectively /proc/sys/kernel)
deny @{PROC}/sys/kernel/{?,??,[^s][^h][^m]**} w, # deny everything except shm* in /proc/sys/kernel/
deny @{PROC}/sysrq-trigger rwklx,