apparmor: improve matching for /proc/<num>

Upstream the improvement made in containerd [containerd@5098827].

[containerd@5098827]: containerd/containerd@5098827

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

apparmor/template.go

@@ -48,7 +48,7 @@ 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,