The commit 75ae04206a4d ("parisc: Define O_NONBLOCK to become
000200000") changed the O_NONBLOCK constant to have only one bit set
(like all other architectures). This change broke some existing
userspace code (e.g. udevadm, systemd-udevd, elogind) which called
specific syscalls which do strict value checking on their flag
parameter.
This patch adds wrapper functions for the relevant syscalls. The
wrappers masks out any old invalid O_NONBLOCK flags, reports in the
syslog if the old O_NONBLOCK value was used and then calls the target
syscall with the new O_NONBLOCK value.
Fixes: 75ae04206a4d ("parisc: Define O_NONBLOCK to become 000200000")
Signed-off-by: Helge Deller <deller@xxxxxx>
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
index 5d458a44b09c..6dbb2315a80d 100644
--- a/arch/parisc/kernel/sys_parisc.c
+++ b/arch/parisc/kernel/sys_parisc.c
@@ -6,7 +6,7 @@
* Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
* Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
* Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
- * Copyright (C) 1999-2014 Helge Deller <deller@xxxxxx>
+ * Copyright (C) 1999-2020 Helge Deller <deller@xxxxxx>
*/
#include <linux/uaccess.h>
@@ -23,6 +23,8 @@
#include <linux/utsname.h>
#include <linux/personality.h>
#include <linux/random.h>
+#include <linux/compat.h>
+#include <linux/version.h>
/* we construct an artificial offset for the mapping based on the physical
* address of the kernel mapping variable */
@@ -373,3 +375,69 @@ long parisc_personality(unsigned long personality)
return err;
}
+
+/*
+ * Up to kernel v5.9 we defined O_NONBLOCK as 000200004,
+ * since then O_NONBLOCK is defined as 000200000.
+ *
+ * The following wrapper functions mask out the old
+ * O_NDELAY bit from calls which use O_NONBLOCK.
+ */
+
+#if ((LINUX_VERSION_CODE >> 16) & 0x0ff) > 5
+#warning "Remove O_NONBLOCK compatibility wrappers now?"
+#endif
+
+#define O_NONBLOCK_OLD 000200004
+#define O_NONBLOCK_MASK_OUT (O_NONBLOCK_OLD & ~O_NONBLOCK)
+static int FIX_O_NONBLOCK(int flags)
+{
+ if (flags & O_NONBLOCK_MASK_OUT) {
+ struct task_struct *tsk = current;
+ pr_warn("%s(%d) uses old O_NONBLOCK value. "
+ "Please recompile the application.\n",
+ tsk->comm, tsk->pid);
+ }
+ return flags & ~O_NONBLOCK_MASK_OUT;
+}
+
+asmlinkage long parisc_timerfd_create(int clockid, int flags)
+{
+ flags = FIX_O_NONBLOCK(flags);
+ return sys_timerfd_create(clockid, flags);
+}
+
+asmlinkage long parisc_signalfd4(int ufd, sigset_t __user *user_mask,
+ size_t sizemask, int flags)
+{
+ flags = FIX_O_NONBLOCK(flags);
+ return sys_signalfd4(ufd, user_mask, sizemask, flags);
+}
+
+#ifdef CONFIG_COMPAT
+asmlinkage long parisc_compat_signalfd4(int ufd,
+ compat_sigset_t __user *user_mask,
+ compat_size_t sizemask, int flags)
+{
+ flags = FIX_O_NONBLOCK(flags);
+ return compat_sys_signalfd4(ufd, user_mask, sizemask, flags);
+}
+#endif
+
+asmlinkage long parisc_eventfd2(unsigned int count, int flags)
+{
+ flags = FIX_O_NONBLOCK(flags);
+ return sys_eventfd2(count, flags);
+}
+
+asmlinkage long parisc_userfaultfd(int flags)
+{
+ flags = FIX_O_NONBLOCK(flags);
+ return sys_userfaultfd(flags);
+}
+
+asmlinkage long parisc_pipe2(int __user *fildes, int flags)
+{
+ flags = FIX_O_NONBLOCK(flags);
+ return sys_pipe2(fildes, flags);
+}
diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl
index def64d221cd4..20ad16e762a1 100644
--- a/arch/parisc/kernel/syscalls/syscall.tbl
+++ b/arch/parisc/kernel/syscalls/syscall.tbl
@@ -344,16 +344,16 @@
304 common eventfd sys_eventfd
305 32 fallocate parisc_fallocate
305 64 fallocate sys_fallocate
-306 common timerfd_create sys_timerfd_create
+306 common timerfd_create parisc_timerfd_create
307 32 timerfd_settime sys_timerfd_settime32
307 64 timerfd_settime sys_timerfd_settime
308 32 timerfd_gettime sys_timerfd_gettime32
308 64 timerfd_gettime sys_timerfd_gettime
-309 common signalfd4 sys_signalfd4 compat_sys_signalfd4
-310 common eventfd2 sys_eventfd2
+309 common signalfd4 parisc_signalfd4 parisc_compat_signalfd4
+310 common eventfd2 parisc_eventfd2
311 common epoll_create1 sys_epoll_create1
312 common dup3 sys_dup3
-313 common pipe2 sys_pipe2
+313 common pipe2 parisc_pipe2
314 common inotify_init1 sys_inotify_init1
315 common preadv sys_preadv compat_sys_preadv
316 common pwritev sys_pwritev compat_sys_pwritev
@@ -387,7 +387,7 @@
341 common bpf sys_bpf
342 common execveat sys_execveat compat_sys_execveat
343 common membarrier sys_membarrier
-344 common userfaultfd sys_userfaultfd
+344 common userfaultfd parisc_userfaultfd
345 common mlock2 sys_mlock2
346 common copy_file_range sys_copy_file_range
347 common preadv2 sys_preadv2 compat_sys_preadv2
