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execve: SUID and SGID

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Matheus
2024-08-24 21:53:05 -03:00
parent cd51d4eaf0
commit 4308317ea5
3 changed files with 29 additions and 0 deletions
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kernel-src/sys/cred.c
+12
View File
@@ -1,5 +1,6 @@
#include <kernel/cred.h>
#include <errno.h>
#include <logging.h>
int cred_setuids(cred_t *cred, int uid, int euid, int suid) {
if (uid < -1 || euid < -1 || suid < -1 || (uid == -1 && euid == -1 && suid == -1))
@@ -27,6 +28,17 @@ int cred_setgids(cred_t *cred, int gid, int egid, int sgid) {
return 0;
}
void cred_doexec(cred_t *cred, int suid, int sgid) {
if (suid > -1)
cred->euid = suid;
if (sgid > -1)
cred->egid = sgid;
cred->suid = cred->euid;
cred->sgid = cred->egid;
}
void cred_getuids(cred_t *cred, int *uidp, int *euidp, int *suidp) {
*uidp = cred->uid;
*euidp = cred->euid;
kernel-src/sys/syscalls/execve.c
+16
View File
@@ -262,6 +262,11 @@ static syscallret_t execve(context_t *context, char *upath, char *uargv[], char
goto error;
}
vattr_t vattr;
ret.errno = VOP_GETATTR(node, &vattr, NULL);
if (ret.errno)
goto error;
ret.ret = 0;
sched_stopotherthreads();
@@ -281,6 +286,17 @@ static syscallret_t execve(context_t *context, char *upath, char *uargv[], char
CTX_SP(context) = (uint64_t)stack;
CTX_IP(context) = (uint64_t)entry;
int suid = -1;
int sgid = -1;
if (vattr.mode & V_ATTR_MODE_SUID)
suid = vattr.uid;
if (vattr.mode & V_ATTR_MODE_SGID)
sgid = vattr.gid;
cred_doexec(&_cpu()->thread->proc->cred, suid, sgid);
error:
free(path);
if (argv)