Ensure we select the correct syscall numbers on a 32-bit Linux system.

lib/util/setid.c

@@ -109,13 +109,25 @@ int samba_setgroups(size_t setlen, const gid_t *gidset);
 #if defined(HAVE_SYS_SYSCALL_H)
 #include <sys/syscall.h>
 #endif
+
+/* Ensure we can't compile in a mixed syscall setup. */
+#if !defined(USE_LINUX_32BIT_SYSCALLS)
+#if defined(SYS_setresuid32) || defined(SYS_setresgid32) || defined(SYS_setreuid32) || defined(SYS_setregid32) || defined(SYS_setuid32) || defined(SYS_setgid32) || defined(SYS_setgroups32)
+#error Mixture of 32-bit Linux system calls and 64-bit calls.
+#endif
+#endif
+
 #endif
 
 /* All the setXX[ug]id functions and setgroups Samba uses. */
 int samba_setresuid(uid_t ruid, uid_t euid, uid_t suid)
 {
 #if defined(USE_LINUX_THREAD_CREDENTIALS)
+#if defined(USE_LINUX_32BIT_SYSCALLS)
+	return syscall(SYS_setresuid32, ruid, euid, suid);
+#else
 	return syscall(SYS_setresuid, ruid, euid, suid);
+#endif
 #elif defined(HAVE_SETRESUID)
 	return setresuid(ruid, euid, suid);
 #else
@@ -127,7 +139,11 @@ int samba_setresuid(uid_t ruid, uid_t euid, uid_t suid)
 int samba_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
 {
 #if defined(USE_LINUX_THREAD_CREDENTIALS)
+#if defined(USE_LINUX_32BIT_SYSCALLS)
+	return syscall(SYS_setresgid32, rgid, egid, sgid);
+#else
 	return syscall(SYS_setresgid, rgid, egid, sgid);
+#endif
 #elif defined(HAVE_SETRESGID)
 	return setresgid(rgid, egid, sgid);
 #else
@@ -139,7 +155,11 @@ int samba_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
 int samba_setreuid(uid_t ruid, uid_t euid)
 {
 #if defined(USE_LINUX_THREAD_CREDENTIALS)
+#if defined(USE_LINUX_32BIT_SYSCALLS)
+	return syscall(SYS_setreuid32, ruid, euid);
+#else
 	return syscall(SYS_setreuid, ruid, euid);
+#endif
 #elif defined(HAVE_SETREUID)
 	return setreuid(ruid, euid);
 #else
@@ -151,7 +171,11 @@ int samba_setreuid(uid_t ruid, uid_t euid)
 int samba_setregid(gid_t rgid, gid_t egid)
 {
 #if defined(USE_LINUX_THREAD_CREDENTIALS)
+#if defined(USE_LINUX_32BIT_SYSCALLS)
+	return syscall(SYS_setregid32, rgid, egid);
+#else
 	return syscall(SYS_setregid, rgid, egid);
+#endif
 #elif defined(HAVE_SETREGID)
 	return setregid(rgid, egid);
 #else
@@ -163,8 +187,13 @@ int samba_setregid(gid_t rgid, gid_t egid)
 int samba_seteuid(uid_t euid)
 {
 #if defined(USE_LINUX_THREAD_CREDENTIALS)
+#if defined(USE_LINUX_32BIT_SYSCALLS)
+	/* seteuid is not a separate system call. */
+	return syscall(SYS_setresuid32, -1, euid, -1);
+#else
 	/* seteuid is not a separate system call. */
 	return syscall(SYS_setresuid, -1, euid, -1);
+#endif
 #elif defined(HAVE_SETEUID)
 	return seteuid(euid);
 #else
@@ -176,8 +205,13 @@ int samba_seteuid(uid_t euid)
 int samba_setegid(gid_t egid)
 {
 #if defined(USE_LINUX_THREAD_CREDENTIALS)
+#if defined(USE_LINUX_32BIT_SYSCALLS)
+	/* setegid is not a separate system call. */
+	return syscall(SYS_setresgid32, -1, egid, -1);
+#else
 	/* setegid is not a separate system call. */
 	return syscall(SYS_setresgid, -1, egid, -1);
+#endif
 #elif defined(HAVE_SETEGID)
 	return setegid(egid);
 #else
@@ -189,7 +223,11 @@ int samba_setegid(gid_t egid)
 int samba_setuid(uid_t uid)
 {
 #if defined(USE_LINUX_THREAD_CREDENTIALS)
+#if defined(USE_LINUX_32BIT_SYSCALLS)
+	return syscall(SYS_setuid32, uid);
+#else
 	return syscall(SYS_setuid, uid);
+#endif
 #elif defined(HAVE_SETUID)
 	return setuid(uid);
 #else
@@ -201,7 +239,11 @@ int samba_setuid(uid_t uid)
 int samba_setgid(gid_t gid)
 {
 #if defined(USE_LINUX_THREAD_CREDENTIALS)
+#if defined(USE_LINUX_32BIT_SYSCALLS)
+	return syscall(SYS_setgid32, gid);
+#else
 	return syscall(SYS_setgid, gid);
+#endif
 #elif defined(HAVE_SETGID)
 	return setgid(gid);
 #else
@@ -235,7 +277,11 @@ int samba_setgidx(int flags, gid_t gid)
 int samba_setgroups(size_t setlen, const gid_t *gidset)
 {
 #if defined(USE_LINUX_THREAD_CREDENTIALS)
+#if defined(USE_LINUX_32BIT_SYSCALLS)
+	return syscall(SYS_setgroups32, setlen, gidset);
+#else
 	return syscall(SYS_setgroups, setlen, gidset);
+#endif
 #elif defined(HAVE_SETGROUPS)
 	return setgroups(setlen, gidset);
 #else