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neverallow ueventd to set properties

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Add a compile time assertion that no SELinux rules exist which
allow ueventd to set properties, or even connect to the property
socket.

See https://android-review.googlesource.com/#/c/133120/6/init/devices.cpp@941
for details.

Change-Id: Ia9e932a3d94443d70644b14f36c74df4be7e9e32
This commit is contained in:
Nick Kralevich 2015-03-02 20:10:48 -08:00
parent 19eecd2dd7
commit 3e113edf02
1 changed files with 11 additions and 0 deletions
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11
ueventd.te
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@ -23,3 +23,14 @@ allow ueventd efs_file:file r_file_perms;
# Use setfscreatecon() to label /dev directories and files.
allow ueventd self:process setfscreate;
#####
##### neverallow rules
#####
# ueventd must never set properties, otherwise deadlocks may occur.
# https://android-review.googlesource.com/#/c/133120/6/init/devices.cpp@941
# No writing to the property socket, connecting to init, or setting properties.
neverallow ueventd property_socket:sock_file write;
neverallow ueventd init:unix_stream_socket connectto;
neverallow ueventd property_type:property_service set;