2018-09-27 19:21:37 +02:00
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type bpfloader_exec, system_file_type, exec_type, file_type;
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2018-01-03 00:31:18 +01:00
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2022-02-10 01:32:44 +01:00
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typeattribute bpfloader bpfdomain;
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2022-02-08 00:15:00 +01:00
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# allow bpfloader to write to the kernel log (starts early)
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allow bpfloader kmsg_device:chr_file w_file_perms;
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2020-01-31 07:08:43 +01:00
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# These permissions are required to pin ebpf maps & programs.
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much more finegrained bpf selinux privs for networking mainline
Goal is to gain a better handle on who has access to which maps
and to allow (with bpfloader changes to create in one directory
and move into the target directory) per-map selection of
selinux context, while still having reasonable defaults for stuff
pinned directly into the target location.
BPFFS (ie. /sys/fs/bpf) labelling is as follows:
subdirectory selinux context mainline usecase / usable by
/ fs_bpf no (*) core operating system (ie. platform)
/net_private fs_bpf_net_private yes, T+ network_stack
/net_shared fs_bpf_net_shared yes, T+ network_stack & system_server
/netd_readonly fs_bpf_netd_readonly yes, T+ network_stack & system_server & r/o to netd
/netd_shared fs_bpf_netd_shared yes, T+ network_stack & system_server & netd [**]
/tethering fs_bpf_tethering yes, S+ network_stack
/vendor fs_bpf_vendor no, T+ vendor
* initial support for bpf was added back in P,
but things worked differently back then with no bpfloader,
and instead netd doing stuff by hand,
bpfloader with pinning into /sys/fs/bpf was (I believe) added in Q
(and was definitely there in R)
** additionally bpf programs are accesible to netutils_wrapper
for use by iptables xt_bpf extensions
'mainline yes' currently means shipped by the com.android.tethering apex,
but this is really another case of bad naming, as it's really
the 'networking/connectivity/tethering' apex / mainline module.
Long term the plan is to merge a few other networking mainline modules
into it (and maybe give it a saner name...).
The reason for splitting net_private vs tethering is that:
S+ must support 4.9+ kernels and S era bpfloader v0.2+
T+ must support 4.14+ kernels and T beta3 era bpfloader v0.13+
The kernel affects the intelligence of the in-kernel bpf verifier
and the available bpf helper functions. Older kernels have
a tendency to reject programs that newer kernels allow.
/ && /vendor are not shipped via mainline, so only need to work
with the bpfloader that's part of the core os.
Bug: 218408035
Test: TreeHugger, manually on cuttlefish
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I674866ebe32aca4fc851818c1ffcbec12ac4f7d4
(cherry picked from commit 15715aea32b85c933778b97a46de6ccab42ca7fb)
2022-05-21 14:03:29 +02:00
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allow bpfloader bpffs_type:dir { add_name create remove_name search write };
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2022-07-02 03:20:01 +02:00
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allow bpfloader bpffs_type:file { create getattr read rename setattr };
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2022-07-18 12:34:30 +02:00
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allow bpfloader bpffs_type:lnk_file { create getattr read };
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much more finegrained bpf selinux privs for networking mainline
Goal is to gain a better handle on who has access to which maps
and to allow (with bpfloader changes to create in one directory
and move into the target directory) per-map selection of
selinux context, while still having reasonable defaults for stuff
pinned directly into the target location.
BPFFS (ie. /sys/fs/bpf) labelling is as follows:
subdirectory selinux context mainline usecase / usable by
/ fs_bpf no (*) core operating system (ie. platform)
/net_private fs_bpf_net_private yes, T+ network_stack
/net_shared fs_bpf_net_shared yes, T+ network_stack & system_server
/netd_readonly fs_bpf_netd_readonly yes, T+ network_stack & system_server & r/o to netd
/netd_shared fs_bpf_netd_shared yes, T+ network_stack & system_server & netd [**]
/tethering fs_bpf_tethering yes, S+ network_stack
/vendor fs_bpf_vendor no, T+ vendor
* initial support for bpf was added back in P,
but things worked differently back then with no bpfloader,
and instead netd doing stuff by hand,
bpfloader with pinning into /sys/fs/bpf was (I believe) added in Q
(and was definitely there in R)
** additionally bpf programs are accesible to netutils_wrapper
for use by iptables xt_bpf extensions
'mainline yes' currently means shipped by the com.android.tethering apex,
but this is really another case of bad naming, as it's really
the 'networking/connectivity/tethering' apex / mainline module.
Long term the plan is to merge a few other networking mainline modules
into it (and maybe give it a saner name...).
The reason for splitting net_private vs tethering is that:
S+ must support 4.9+ kernels and S era bpfloader v0.2+
T+ must support 4.14+ kernels and T beta3 era bpfloader v0.13+
The kernel affects the intelligence of the in-kernel bpf verifier
and the available bpf helper functions. Older kernels have
a tendency to reject programs that newer kernels allow.
/ && /vendor are not shipped via mainline, so only need to work
with the bpfloader that's part of the core os.
Bug: 218408035
Test: TreeHugger, manually on cuttlefish
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I674866ebe32aca4fc851818c1ffcbec12ac4f7d4
(cherry picked from commit 15715aea32b85c933778b97a46de6ccab42ca7fb)
2022-05-21 14:03:29 +02:00
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allow { bpffs_type -fs_bpf } fs_bpf:filesystem associate;
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2018-01-03 00:31:18 +01:00
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2020-01-31 07:08:43 +01:00
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# Allow bpfloader to create bpf maps and programs.
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allow bpfloader self:bpf { map_create map_read map_write prog_load prog_run };
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2018-01-03 00:31:18 +01:00
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2021-03-02 08:16:46 +01:00
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allow bpfloader self:capability { chown sys_admin net_admin };
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2018-09-13 20:07:14 +02:00
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2021-11-12 01:53:26 +01:00
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allow bpfloader sysfs_fs_fuse_bpf:file r_file_perms;
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2022-12-03 13:19:31 +01:00
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allow bpfloader proc_bpf:file w_file_perms;
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2021-01-29 23:36:32 +01:00
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set_prop(bpfloader, bpf_progs_loaded_prop)
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2022-01-19 07:57:41 +01:00
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allow bpfloader bpfloader_exec:file execute_no_trans;
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2018-09-13 20:07:14 +02:00
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###
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### Neverallow rules
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###
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2020-01-31 07:08:43 +01:00
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2022-12-01 15:45:35 +01:00
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# Note: we don't care about getattr/mounton/search
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2022-12-03 10:13:05 +01:00
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neverallow { domain } bpffs_type:dir ~{ add_name create getattr mounton remove_name search write };
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much more finegrained bpf selinux privs for networking mainline
Goal is to gain a better handle on who has access to which maps
and to allow (with bpfloader changes to create in one directory
and move into the target directory) per-map selection of
selinux context, while still having reasonable defaults for stuff
pinned directly into the target location.
BPFFS (ie. /sys/fs/bpf) labelling is as follows:
subdirectory selinux context mainline usecase / usable by
/ fs_bpf no (*) core operating system (ie. platform)
/net_private fs_bpf_net_private yes, T+ network_stack
/net_shared fs_bpf_net_shared yes, T+ network_stack & system_server
/netd_readonly fs_bpf_netd_readonly yes, T+ network_stack & system_server & r/o to netd
/netd_shared fs_bpf_netd_shared yes, T+ network_stack & system_server & netd [**]
/tethering fs_bpf_tethering yes, S+ network_stack
/vendor fs_bpf_vendor no, T+ vendor
* initial support for bpf was added back in P,
but things worked differently back then with no bpfloader,
and instead netd doing stuff by hand,
bpfloader with pinning into /sys/fs/bpf was (I believe) added in Q
(and was definitely there in R)
** additionally bpf programs are accesible to netutils_wrapper
for use by iptables xt_bpf extensions
'mainline yes' currently means shipped by the com.android.tethering apex,
but this is really another case of bad naming, as it's really
the 'networking/connectivity/tethering' apex / mainline module.
Long term the plan is to merge a few other networking mainline modules
into it (and maybe give it a saner name...).
The reason for splitting net_private vs tethering is that:
S+ must support 4.9+ kernels and S era bpfloader v0.2+
T+ must support 4.14+ kernels and T beta3 era bpfloader v0.13+
The kernel affects the intelligence of the in-kernel bpf verifier
and the available bpf helper functions. Older kernels have
a tendency to reject programs that newer kernels allow.
/ && /vendor are not shipped via mainline, so only need to work
with the bpfloader that's part of the core os.
Bug: 218408035
Test: TreeHugger, manually on cuttlefish
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I674866ebe32aca4fc851818c1ffcbec12ac4f7d4
(cherry picked from commit 15715aea32b85c933778b97a46de6ccab42ca7fb)
2022-05-21 14:03:29 +02:00
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neverallow { domain -bpfloader } bpffs_type:dir { add_name create remove_name write };
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2020-01-31 07:08:43 +01:00
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2022-12-03 10:13:05 +01:00
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neverallow { domain } bpffs_type:file ~{ create getattr map open read rename setattr write };
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2023-03-28 03:14:40 +02:00
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neverallow { domain -bpfloader } bpffs_type:file { create map open rename setattr };
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neverallow { domain -bpfloader -gpuservice -lmkd -mediaprovider_app -netd -netutils_wrapper -system_server } fs_bpf:file { getattr read };
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neverallow { domain -bpfloader } fs_bpf_loader:file { getattr read };
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neverallow { domain -bpfloader -network_stack } fs_bpf_net_private:file { getattr read };
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neverallow { domain -bpfloader -network_stack -system_server } fs_bpf_net_shared:file { getattr read };
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neverallow { domain -bpfloader -netd -network_stack -system_server } fs_bpf_netd_readonly:file { getattr read };
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neverallow { domain -bpfloader -netd -netutils_wrapper -network_stack -system_server } fs_bpf_netd_shared:file { getattr read };
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neverallow { domain -bpfloader -network_stack } fs_bpf_tethering:file { getattr read };
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2023-09-25 20:42:03 +02:00
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neverallow { domain -bpfloader -uprobestats } fs_bpf_uprobe_private:file { getattr read };
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neverallow { domain -bpfloader -gpuservice -netd -netutils_wrapper -network_stack -system_server -uprobestats } { bpffs_type -fs_bpf_vendor }:file write;
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2020-01-31 07:08:43 +01:00
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2022-07-18 12:34:30 +02:00
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neverallow { domain -bpfloader } bpffs_type:lnk_file ~read;
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neverallow { domain -bpfdomain } bpffs_type:lnk_file read;
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2019-04-09 06:34:53 +02:00
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neverallow { domain -bpfloader } *:bpf { map_create prog_load };
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2022-12-03 10:13:05 +01:00
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# 'fs_bpf_loader' is for internal use of the BpfLoader oneshot boot time process.
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2022-12-01 15:45:35 +01:00
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neverallow { domain -bpfloader } fs_bpf_loader:bpf *;
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2022-12-03 10:13:05 +01:00
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neverallow { domain -bpfloader } fs_bpf_loader:file *;
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2019-12-14 00:18:32 +01:00
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2022-03-08 23:56:27 +01:00
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neverallow {
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domain
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-bpfloader
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-gpuservice
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-hal_health_server
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-mediaprovider_app
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-netd
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-netutils_wrapper
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-network_stack
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-system_server
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2023-09-25 20:42:03 +02:00
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-uprobestats
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2022-03-08 23:56:27 +01:00
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} *:bpf prog_run;
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2023-09-25 20:42:03 +02:00
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neverallow { domain -bpfloader -gpuservice -lmkd -mediaprovider_app -netd -network_stack -system_server -uprobestats } *:bpf { map_read map_write };
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2018-11-29 22:07:40 +01:00
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neverallow { domain -bpfloader -init } bpfloader_exec:file { execute execute_no_trans };
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2020-01-31 07:08:43 +01:00
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2022-12-01 15:45:35 +01:00
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neverallow { coredomain -bpfloader } fs_bpf_vendor:file *;
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2019-12-14 00:18:32 +01:00
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2021-01-29 23:36:32 +01:00
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neverallow bpfloader *:{ tcp_socket udp_socket rawip_socket } *;
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2018-05-23 17:36:40 +02:00
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2018-09-13 20:07:14 +02:00
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# No domain should be allowed to ptrace bpfloader
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neverallow { domain userdebug_or_eng(`-llkd') } bpfloader:process ptrace;
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2021-11-11 10:51:15 +01:00
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2022-12-03 13:19:31 +01:00
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neverallow { domain -bpfloader } proc_bpf:file write;
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