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Correctly handle is_ksu_domain, close #972 #1246

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merged 3 commits into from
Jan 4, 2024
Merged

Correctly handle is_ksu_domain, close #972 #1246

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3ac3294
don't cache, cause domain may not be su
Ylarod Jan 4, 2024
670d094
init ksu_sid in is_ksu_domain if zero
Ylarod Jan 4, 2024
ba741b2
properly handle is_ksu_domain
Ylarod Jan 4, 2024
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13 changes: 7 additions & 6 deletions kernel/selinux/selinux.c
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Original file line number Diff line number Diff line change
Expand Up @@ -8,8 +8,6 @@

#define KERNEL_SU_DOMAIN "u:r:su:s0"

static u32 ksu_sid;

static int transive_to_domain(const char *domain)
{
struct cred *cred;
Expand All @@ -31,9 +29,6 @@ static int transive_to_domain(const char *domain)
domain, sid, error);
}
if (!error) {
if (!ksu_sid)
ksu_sid = sid;

tsec->sid = sid;
tsec->create_sid = 0;
tsec->keycreate_sid = 0;
Expand Down Expand Up @@ -106,7 +101,13 @@ static inline u32 current_sid(void)

bool is_ksu_domain()
{
return ksu_sid && current_sid() == ksu_sid;
char *domain;
u32 seclen;
int err = security_secid_to_secctx(current_sid(), &domain, &seclen);
if (err) {
return false;
}
return strncmp(KERNEL_SU_DOMAIN, domain, seclen) == 0;
}

bool is_zygote(void *sec)
Expand Down
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