From: Stephen Smalley stephen.smalley.work@gmail.com
[ Upstream commit e8ba53d0023a76ba0f50e6ee3e6288c5442f9d33 ]
Use READ_ONCE/WRITE_ONCE for all accesses to the selinux_state.policycaps booleans to prevent compiler mischief.
Signed-off-by: Stephen Smalley stephen.smalley.work@gmail.com Signed-off-by: Paul Moore paul@paul-moore.com Signed-off-by: Sasha Levin sashal@kernel.org --- security/selinux/include/security.h | 14 +++++++------- security/selinux/ss/services.c | 3 ++- 2 files changed, 9 insertions(+), 8 deletions(-)
diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h index b0e02cfe3ce14..8a432f646967e 100644 --- a/security/selinux/include/security.h +++ b/security/selinux/include/security.h @@ -177,49 +177,49 @@ static inline bool selinux_policycap_netpeer(void) { struct selinux_state *state = &selinux_state;
- return state->policycap[POLICYDB_CAPABILITY_NETPEER]; + return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_NETPEER]); }
static inline bool selinux_policycap_openperm(void) { struct selinux_state *state = &selinux_state;
- return state->policycap[POLICYDB_CAPABILITY_OPENPERM]; + return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_OPENPERM]); }
static inline bool selinux_policycap_extsockclass(void) { struct selinux_state *state = &selinux_state;
- return state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS]; + return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS]); }
static inline bool selinux_policycap_alwaysnetwork(void) { struct selinux_state *state = &selinux_state;
- return state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK]; + return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK]); }
static inline bool selinux_policycap_cgroupseclabel(void) { struct selinux_state *state = &selinux_state;
- return state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL]; + return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL]); }
static inline bool selinux_policycap_nnp_nosuid_transition(void) { struct selinux_state *state = &selinux_state;
- return state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION]; + return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION]); }
static inline bool selinux_policycap_genfs_seclabel_symlinks(void) { struct selinux_state *state = &selinux_state;
- return state->policycap[POLICYDB_CAPABILITY_GENFS_SECLABEL_SYMLINKS]; + return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_GENFS_SECLABEL_SYMLINKS]); }
int security_mls_enabled(struct selinux_state *state); diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index ef0afd878bfca..04d1afe01838b 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -2103,7 +2103,8 @@ static void security_load_policycaps(struct selinux_state *state) struct ebitmap_node *node;
for (i = 0; i < ARRAY_SIZE(state->policycap); i++) - state->policycap[i] = ebitmap_get_bit(&p->policycaps, i); + WRITE_ONCE(state->policycap[i], + ebitmap_get_bit(&p->policycaps, i));
for (i = 0; i < ARRAY_SIZE(selinux_policycap_names); i++) pr_info("SELinux: policy capability %s=%d\n",