syscalls: umask

kernel-src/sys/syscalls/chmod.c

@@ -11,7 +11,7 @@ static int dochmod(vnode_t *node, mode_t mode) {
 	if (e)
 		return e;
 
-	attr.mode = mode;
+	attr.mode = UMASK(mode);
 
 	return VOP_SETATTR(node, &attr, cred);
 }

kernel-src/sys/syscalls/linkat.c

@@ -40,7 +40,8 @@ syscallret_t syscall_linkat(context_t *, int olddirfd, const char *uoldpath, int
 
 	vattr_t attr = {
 		.gid = _cpu()->thread->proc->cred.gid,
-		.uid = _cpu()->thread->proc->cred.uid
+		.uid = _cpu()->thread->proc->cred.uid,
+		.mode = UMASK(0777)
 	};
 
 	ret.errno = vfs_link(olddirnode, oldpath, newdirnode, newpath, type == 0 ? V_TYPE_REGULAR : V_TYPE_LINK, &attr);

kernel-src/sys/syscalls/mkdirat.c

@@ -26,7 +26,7 @@ syscallret_t syscall_mkdirat(context_t *, int dirfd, const char *upath, mode_t m
 		goto cleanup;
 
 	vattr_t attr = {
-		.mode = mode,
+		.mode = UMASK(mode),
 		.gid = _cpu()->thread->proc->cred.gid,
 		.uid = _cpu()->thread->proc->cred.uid
 	};

kernel-src/sys/syscalls/open.c

@@ -35,7 +35,7 @@ syscallret_t syscall_openat(context_t *context, int dirfd, const char *path, int
 
 	if (ret.errno == ENOENT && (flags & O_CREAT)) {
 		vattr_t attr = {
-			.mode = mode,
+			.mode = UMASK(mode),
 			.gid = _cpu()->thread->proc->cred.gid,
 			.uid = _cpu()->thread->proc->cred.uid
 		};

kernel-src/sys/syscalls/umask.c

@@ -0,0 +1,14 @@
+#include <kernel/syscalls.h>
+#include <arch/cpu.h>
+
+syscallret_t syscall_umask(context_t *, mode_t mode) {
+	syscallret_t ret = {
+		.errno = 0
+	};
+
+	mode &= 0777;
+
+	ret.ret = __atomic_exchange_n(&_cpu()->thread->proc->umask, mode, __ATOMIC_SEQ_CST);
+
+	return ret;
+}