x86/ipc: Fix x32 version of shmid64_ds and msqid64_ds

A bugfix broke the x32 shmid64_ds and msqid64_ds data structure layout
(as seen from user space)  a few years ago: Originally, __BITS_PER_LONG
was defined as 64 on x32, so we did not have padding after the 64-bit
__kernel_time_t fields, After __BITS_PER_LONG got changed to 32,
applications would observe extra padding.

In other parts of the uapi headers we seem to have a mix of those
expecting either 32 or 64 on x32 applications, so we can't easily revert
the path that broke these two structures.

Instead, this patch decouples x32 from the other architectures and moves
it back into arch specific headers, partially reverting the even older
commit 906f23f858b9 ("x86: remove all now-duplicate header files").

It's not clear whether this ever made any difference, since at least
glibc carries its own (correct) copy of both of these header files,
so possibly no application has ever observed the definitions here.

Based on a suggestion from H.J. Lu, I tried out the tool from
https://github.com/hjl-tools/linux-header to find other such
bugs, which pointed out the same bug in statfs(), which also has
a separate (correct) copy in glibc.

Fixes: 7c39d16c659d ("x86/headers/uapi: Fix __BITS_PER_LONG value for x32 builds")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "H . J . Lu" <hjl.tools@gmail.com>
Cc: Jeffrey Walton <noloader@gmail.com>
Cc: stable@vger.kernel.org
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: https://lkml.kernel.org/r/20180424212013.3967461-1-arnd@arndb.de

diff --git a/arch/x86/include/uapi/asm/msgbuf.h b/arch/x86/include/uapi/asm/msgbuf.h
index 809134c644a677032e9eb2ae5d5a844806bc347e..90ab9a795b49329b5d06cdb45e15cb800a04ff63 100644 (file)
--- a/arch/x86/include/uapi/asm/msgbuf.h
+++ b/arch/x86/include/uapi/asm/msgbuf.h
@@ -1 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef __ASM_X64_MSGBUF_H
+#define __ASM_X64_MSGBUF_H
+
+#if !defined(__x86_64__) || !defined(__ILP32__)
 #include <asm-generic/msgbuf.h>
+#else
+/*
+ * The msqid64_ds structure for x86 architecture with x32 ABI.
+ *
+ * On x86-32 and x86-64 we can just use the generic definition, but
+ * x32 uses the same binary layout as x86_64, which is differnet
+ * from other 32-bit architectures.
+ */
+
+struct msqid64_ds {
+       struct ipc64_perm msg_perm;
+       __kernel_time_t msg_stime;      /* last msgsnd time */
+       __kernel_time_t msg_rtime;      /* last msgrcv time */
+       __kernel_time_t msg_ctime;      /* last change time */
+       __kernel_ulong_t msg_cbytes;    /* current number of bytes on queue */
+       __kernel_ulong_t msg_qnum;      /* number of messages in queue */
+       __kernel_ulong_t msg_qbytes;    /* max number of bytes on queue */
+       __kernel_pid_t msg_lspid;       /* pid of last msgsnd */
+       __kernel_pid_t msg_lrpid;       /* last receive pid */
+       __kernel_ulong_t __unused4;
+       __kernel_ulong_t __unused5;
+};
+
+#endif
+
+#endif /* __ASM_GENERIC_MSGBUF_H */

diff --git a/arch/x86/include/uapi/asm/shmbuf.h b/arch/x86/include/uapi/asm/shmbuf.h
index 83c05fc2de385c3260286bf12fed846617c8c095..644421f3823beefb16ddc83979fbdf01c15c6a7a 100644 (file)
--- a/arch/x86/include/uapi/asm/shmbuf.h
+++ b/arch/x86/include/uapi/asm/shmbuf.h
@@ -1 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef __ASM_X86_SHMBUF_H
+#define __ASM_X86_SHMBUF_H
+
+#if !defined(__x86_64__) || !defined(__ILP32__)
 #include <asm-generic/shmbuf.h>
+#else
+/*
+ * The shmid64_ds structure for x86 architecture with x32 ABI.
+ *
+ * On x86-32 and x86-64 we can just use the generic definition, but
+ * x32 uses the same binary layout as x86_64, which is differnet
+ * from other 32-bit architectures.
+ */
+
+struct shmid64_ds {
+       struct ipc64_perm       shm_perm;       /* operation perms */
+       size_t                  shm_segsz;      /* size of segment (bytes) */
+       __kernel_time_t         shm_atime;      /* last attach time */
+       __kernel_time_t         shm_dtime;      /* last detach time */
+       __kernel_time_t         shm_ctime;      /* last change time */
+       __kernel_pid_t          shm_cpid;       /* pid of creator */
+       __kernel_pid_t          shm_lpid;       /* pid of last operator */
+       __kernel_ulong_t        shm_nattch;     /* no. of current attaches */
+       __kernel_ulong_t        __unused4;
+       __kernel_ulong_t        __unused5;
+};
+
+struct shminfo64 {
+       __kernel_ulong_t        shmmax;
+       __kernel_ulong_t        shmmin;
+       __kernel_ulong_t        shmmni;
+       __kernel_ulong_t        shmseg;
+       __kernel_ulong_t        shmall;
+       __kernel_ulong_t        __unused1;
+       __kernel_ulong_t        __unused2;
+       __kernel_ulong_t        __unused3;
+       __kernel_ulong_t        __unused4;
+};
+
+#endif
+
+#endif /* __ASM_X86_SHMBUF_H */