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kernel: Refactor selinux/selinux.c (#2881)

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Signed-off-by: shadichy <shadichy@blisslabs.org>
Co-authored-by: Wang Han <416810799@qq.com>
This commit is contained in:
Shadichy
2025-11-07 21:18:05 +07:00
committed by ShirkNeko
parent 66032391af
commit c6d9f76c7b
2 changed files with 19 additions and 60 deletions
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8
kernel/selinux/Makefile
View File

@@ -2,14 +2,6 @@ obj-y += selinux.o
obj-y += sepolicy.o
obj-y += rules.o
ifeq ($(shell grep -q " current_sid(void)" $(srctree)/security/selinux/include/objsec.h; echo $$?),0)
ccflags-y += -DKSU_COMPAT_HAS_CURRENT_SID
endif
ifeq ($(shell grep -q "struct selinux_state " $(srctree)/security/selinux/include/security.h; echo $$?),0)
ccflags-y += -DKSU_COMPAT_HAS_SELINUX_STATE
endif
ccflags-y += -Wno-strict-prototypes -Wno-int-conversion
ccflags-y += -Wno-declaration-after-statement -Wno-unused-function
ccflags-y += -I$(srctree)/security/selinux -I$(srctree)/security/selinux/include

71
kernel/selinux/selinux.c
View File

@@ -42,13 +42,6 @@ void setup_selinux(const char *domain)
pr_err("transive domain failed.\n");
return;
}
/* we didn't need this now, we have change selinux rules when boot!
if (!is_domain_permissive) {
if (set_domain_permissive() == 0) {
is_domain_permissive = true;
}
}*/
}
void setenforce(bool enforce)
@@ -73,27 +66,28 @@ bool getenforce()
#endif
}
#if (LINUX_VERSION_CODE < KERNEL_VERSION(5, 10, 0)) && \
!defined(KSU_COMPAT_HAS_CURRENT_SID)
/*
* get the subjective security ID of the current task
*/
static inline u32 current_sid(void)
{
const struct task_security_struct *tsec = current_security();
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 14, 0)
struct lsm_context {
char *context;
u32 len;
};
return tsec->sid;
static int __security_secid_to_secctx(u32 secid, struct lsm_context *cp)
{
return security_secid_to_secctx(secid, &cp->context, &cp->len);
}
static void __security_release_secctx(struct lsm_context *cp)
{
return security_release_secctx(cp->context, cp->len);
}
#else
#define __security_secid_to_secctx security_secid_to_secctx
#define __security_release_secctx security_release_secctx
#endif
bool is_task_ksu_domain(const struct cred* cred)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 14, 0)
struct lsm_context ctx;
#else
char *domain;
u32 seclen;
#endif
bool result;
if (!cred) {
return false;
@@ -102,23 +96,12 @@ bool is_task_ksu_domain(const struct cred* cred)
if (!tsec) {
return false;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 14, 0)
int err = security_secid_to_secctx(tsec->sid, &ctx);
#else
int err = security_secid_to_secctx(tsec->sid, &domain, &seclen);
#endif
int err = __security_secid_to_secctx(tsec->sid, &ctx);
if (err) {
return false;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 14, 0)
result = strncmp(KERNEL_SU_DOMAIN, ctx.context, ctx.len) == 0;
security_release_secctx(&ctx);
#else
result = strncmp(KERNEL_SU_DOMAIN, domain, seclen) == 0;
security_release_secctx(domain, seclen);
#endif
__security_release_secctx(&ctx);
return result;
}
@@ -137,30 +120,14 @@ bool is_zygote(const struct cred* cred)
if (!tsec) {
return false;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 14, 0)
struct lsm_context ctx;
#else
char *domain;
u32 seclen;
#endif
bool result;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 14, 0)
int err = security_secid_to_secctx(tsec->sid, &ctx);
#else
int err = security_secid_to_secctx(tsec->sid, &domain, &seclen);
#endif
int err = __security_secid_to_secctx(tsec->sid, &ctx);
if (err) {
return false;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 14, 0)
result = strncmp("u:r:zygote:s0", ctx.context, ctx.len) == 0;
security_release_secctx(&ctx);
#else
result = strncmp("u:r:zygote:s0", domain, seclen) == 0;
security_release_secctx(domain, seclen);
#endif
__security_release_secctx(&ctx);
return result;
}