Add userspace vuid/vgid contexts

[lttng-ust.git] / liblttng-ust-fork / ustfork.c

diff --git a/liblttng-ust-fork/ustfork.c b/liblttng-ust-fork/ustfork.c
index 25f9d4cc04c31d2589e36d148684bf61d846c5aa..983ed04f83e11316690430e494ffe4939a44bd9b 100644 (file)
--- a/liblttng-ust-fork/ustfork.c
+++ b/liblttng-ust-fork/ustfork.c
@@ -89,6 +89,156 @@ int daemon(int nochdir, int noclose)
        return retval;
 }
 
+int setuid(uid_t uid)
+{
+       static int (*plibc_func)(uid_t uid) = NULL;
+       int retval;
+       int saved_errno;
+
+       if (plibc_func == NULL) {
+               plibc_func = dlsym(RTLD_NEXT, "setuid");
+               if (plibc_func == NULL) {
+                       fprintf(stderr, "libustfork: unable to find \"setuid\" symbol\n");
+                       errno = ENOSYS;
+                       return -1;
+               }
+       }
+
+       /* Do the real setuid */
+       retval = plibc_func(uid);
+       saved_errno = errno;
+
+       ust_after_setuid();
+
+       errno = saved_errno;
+       return retval;
+}
+
+int setgid(gid_t gid)
+{
+       static int (*plibc_func)(gid_t gid) = NULL;
+       int retval;
+       int saved_errno;
+
+       if (plibc_func == NULL) {
+               plibc_func = dlsym(RTLD_NEXT, "setgid");
+               if (plibc_func == NULL) {
+                       fprintf(stderr, "libustfork: unable to find \"setgid\" symbol\n");
+                       errno = ENOSYS;
+                       return -1;
+               }
+       }
+
+       /* Do the real setgid */
+       retval = plibc_func(gid);
+       saved_errno = errno;
+
+       ust_after_setgid();
+
+       errno = saved_errno;
+       return retval;
+}
+
+int seteuid(uid_t euid)
+{
+       static int (*plibc_func)(uid_t euid) = NULL;
+       int retval;
+       int saved_errno;
+
+       if (plibc_func == NULL) {
+               plibc_func = dlsym(RTLD_NEXT, "seteuid");
+               if (plibc_func == NULL) {
+                       fprintf(stderr, "libustfork: unable to find \"seteuid\" symbol\n");
+                       errno = ENOSYS;
+                       return -1;
+               }
+       }
+
+       /* Do the real seteuid */
+       retval = plibc_func(euid);
+       saved_errno = errno;
+
+       ust_after_seteuid();
+
+       errno = saved_errno;
+       return retval;
+}
+
+int setegid(gid_t egid)
+{
+       static int (*plibc_func)(gid_t egid) = NULL;
+       int retval;
+       int saved_errno;
+
+       if (plibc_func == NULL) {
+               plibc_func = dlsym(RTLD_NEXT, "setegid");
+               if (plibc_func == NULL) {
+                       fprintf(stderr, "libustfork: unable to find \"setegid\" symbol\n");
+                       errno = ENOSYS;
+                       return -1;
+               }
+       }
+
+       /* Do the real setegid */
+       retval = plibc_func(egid);
+       saved_errno = errno;
+
+       ust_after_setegid();
+
+       errno = saved_errno;
+       return retval;
+}
+
+int setreuid(uid_t ruid, uid_t euid)
+{
+       static int (*plibc_func)(uid_t ruid, uid_t euid) = NULL;
+       int retval;
+       int saved_errno;
+
+       if (plibc_func == NULL) {
+               plibc_func = dlsym(RTLD_NEXT, "setreuid");
+               if (plibc_func == NULL) {
+                       fprintf(stderr, "libustfork: unable to find \"setreuid\" symbol\n");
+                       errno = ENOSYS;
+                       return -1;
+               }
+       }
+
+       /* Do the real setreuid */
+       retval = plibc_func(ruid, euid);
+       saved_errno = errno;
+
+       ust_after_setreuid();
+
+       errno = saved_errno;
+       return retval;
+}
+
+int setregid(gid_t rgid, gid_t egid)
+{
+       static int (*plibc_func)(gid_t rgid, gid_t egid) = NULL;
+       int retval;
+       int saved_errno;
+
+       if (plibc_func == NULL) {
+               plibc_func = dlsym(RTLD_NEXT, "setregid");
+               if (plibc_func == NULL) {
+                       fprintf(stderr, "libustfork: unable to find \"setregid\" symbol\n");
+                       errno = ENOSYS;
+                       return -1;
+               }
+       }
+
+       /* Do the real setregid */
+       retval = plibc_func(rgid, egid);
+       saved_errno = errno;
+
+       ust_after_setregid();
+
+       errno = saved_errno;
+       return retval;
+}
+
 #ifdef __linux__
 
 struct user_desc;
@@ -210,6 +360,56 @@ int unshare(int flags)
        return retval;
 }
 
+int setresuid(uid_t ruid, uid_t euid, uid_t suid)
+{
+       static int (*plibc_func)(uid_t ruid, uid_t euid, uid_t suid) = NULL;
+       int retval;
+       int saved_errno;
+
+       if (plibc_func == NULL) {
+               plibc_func = dlsym(RTLD_NEXT, "setresuid");
+               if (plibc_func == NULL) {
+                       fprintf(stderr, "libustfork: unable to find \"setresuid\" symbol\n");
+                       errno = ENOSYS;
+                       return -1;
+               }
+       }
+
+       /* Do the real setresuid */
+       retval = plibc_func(ruid, euid, suid);
+       saved_errno = errno;
+
+       ust_after_setresuid();
+
+       errno = saved_errno;
+       return retval;
+}
+
+int setresgid(gid_t rgid, gid_t egid, gid_t sgid)
+{
+       static int (*plibc_func)(gid_t rgid, gid_t egid, gid_t sgid) = NULL;
+       int retval;
+       int saved_errno;
+
+       if (plibc_func == NULL) {
+               plibc_func = dlsym(RTLD_NEXT, "setresgid");
+               if (plibc_func == NULL) {
+                       fprintf(stderr, "libustfork: unable to find \"setresgid\" symbol\n");
+                       errno = ENOSYS;
+                       return -1;
+               }
+       }
+
+       /* Do the real setresgid */
+       retval = plibc_func(rgid, egid, sgid);
+       saved_errno = errno;
+
+       ust_after_setresgid();
+
+       errno = saved_errno;
+       return retval;
+}
+
 #elif defined (__FreeBSD__)
 
 pid_t rfork(int flags)