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-rw-r--r--libc/sysdeps/linux/common/setegid.c24
-rw-r--r--libc/sysdeps/linux/common/seteuid.c21
2 files changed, 42 insertions, 3 deletions
diff --git a/libc/sysdeps/linux/common/setegid.c b/libc/sysdeps/linux/common/setegid.c
index 90928c247..100a34568 100644
--- a/libc/sysdeps/linux/common/setegid.c
+++ b/libc/sysdeps/linux/common/setegid.c
@@ -1,8 +1,28 @@
-#include <stdlib.h>
+#define _GNU_SOURCE
#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <grp.h>
#include <sys/types.h>
+#include <sys/syscall.h>
int setegid(gid_t gid)
{
- return setregid(-1, gid);
+ int result;
+
+ if (gid == (gid_t) ~0)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+#ifdef __NR_setresgid
+ result = setresgid(-1, gid, -1);
+ if (result == -1 && errno == ENOSYS)
+ /* Will also set the saved group ID if egid != gid,
+ * making it impossible to switch back...*/
+#endif
+ result = setregid(-1, gid);
+
+ return result;
}
diff --git a/libc/sysdeps/linux/common/seteuid.c b/libc/sysdeps/linux/common/seteuid.c
index fbf60909d..e970e0711 100644
--- a/libc/sysdeps/linux/common/seteuid.c
+++ b/libc/sysdeps/linux/common/seteuid.c
@@ -1,9 +1,28 @@
+#define _GNU_SOURCE
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
+#include <pwd.h>
#include <sys/types.h>
+#include <sys/syscall.h>
int seteuid(uid_t uid)
{
- return setreuid(-1, uid);
+ int result;
+
+ if (uid == (uid_t) ~0)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+#ifdef __NR_setresuid
+ result = setresuid(-1, uid, -1);
+ if (result == -1 && errno == ENOSYS)
+ /* Will also set the saved user ID if euid != uid,
+ * making it impossible to switch back...*/
+#endif
+ result = setreuid(-1, uid);
+
+ return result;
}