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SubjectRe: compat: autofs v5 packet size ambiguity - update
On Tue, Feb 21, 2012 at 7:47 PM, Linus Torvalds
<> wrote:
> And then it does a AUTOFS_IOC_PROTOVER ioctl to see what the protocol
> version is.
> So we could just decide that
>  (a) we add a mount option for the packet size (or just "v6" - which
> would be "v5 with a fixed packet size")
>  (b) in the absence of an explicit mount option, we look at
> is_compat_task() for the first AUTOFS_IOC_PROTOVER ioctl we get.

Ok, so here's a patch that does that. Well, it doesn't do that (a)
part, but it does the auto-detection of whether the daemon is a compat
process or not.

THIS IS UNTESTED. Thomas - could you test this in your environment? I
added your "Tested-by:", but that's really for the previous patch that
tested is_compat_task() in the wrong context.

From 46959f6237f4d2131ec58c4868022e34f20715b8 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <>
Date: Tue, 21 Feb 2012 17:36:06 -0800
Subject: [PATCH] autofs: work around unhappy compat problem on x86-64

When the autofs protocol version 5 packet type was added in commit
5c0a32fc2cd0 ("autofs4: add new packet type for v5 communications"), it
obvously tried quite hard to be word-size agnostic, and uses explicitly
sized fields that are all correctly aligned.

However, with the final "char name[NAME_MAX+1]" array at the end, the
actual size of the structure ends up being not very well defined:
because the struct isn't marked 'packed', doing a "sizeof()" on it will
align the size of the struct up to the biggest alignment of the members
it has.

And despite all the members being the same, the alignment of them is
different: a "__u64" has 4-byte alignment on x86-32, but native 8-byte
alignment on x86-64. And while 'NAME_MAX+1' ends up being a nice round
number (256), the name[] array starts out a 4-byte aligned.

End result: the "packed" size of the structure is 300 bytes: 4-byte, but
not 8-byte aligned.

As a result, despite all the fields being in the same place on all
architectures, sizeof() will round up that size to 304 bytes on
architectures that have 8-byte alignment for u64.

Note that this is *not* a problem for 32-bit compat mode on POWER, since
there __u64 is 8-byte aligned even in 32-bit mode. But on x86, 32-bit
and 64-bit alignment is different for 64-bit entities, and as a result
the structure that has exactly the same layout has different sizes.

So on x86-64, but no other architecture, we will just subtract 4 from
the size of the structure when running in a compat task. That way we
will write the properly sized packet that user mode expects.

Not pretty. Sadly, this very subtle, and unnecessary, size difference
has been encoded in user space that wants to read packets of *exactly*
the right size, and will refuse to touch anything else.

Reported-and-tested-by: Thomas Meyer <>
Cc: Ian Kent <>
Signed-off-by: Linus Torvalds <>
fs/autofs4/autofs_i.h | 1 +
fs/autofs4/inode.c | 1 +
fs/autofs4/root.c | 2 ++
fs/autofs4/waitq.c | 21 +++++++++++++++++++--
4 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index d8d8e7ba6a1e..eb1cc92cd67d 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -110,6 +110,7 @@ struct autofs_sb_info {
int sub_version;
int min_proto;
int max_proto;
+ int compat_daemon;
unsigned long exp_timeout;
unsigned int type;
int reghost_enabled;
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index e16980b00b8d..2920bbdebdf3 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -224,6 +224,7 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
sbi->min_proto = 0;
sbi->max_proto = 0;
+ sbi->compat_daemon = -1; /* unknown */
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 75e5f1c8e028..698329e6ea46 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -779,6 +779,8 @@ static inline int autofs4_get_set_timeout(struct autofs_sb_info *sbi,
/* Return protocol version */
static inline int autofs4_get_protover(struct autofs_sb_info *sbi, int __user *p)
+ if (sbi->compat_daemon < 0)
+ sbi->compat_daemon = is_compat_task();
return put_user(sbi->version, p);

diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index da8876d38a7b..f932eb1aab05 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -15,6 +15,7 @@
#include <linux/time.h>
#include <linux/signal.h>
#include <linux/file.h>
+#include <linux/compat.h>
#include "autofs_i.h"

/* We make this a static variable rather than a part of the superblock; it
@@ -91,6 +92,23 @@ static int autofs4_write(struct autofs_sb_info *sbi,

return (bytes > 0);
+ * The autofs_v5 packet was misdesigned.
+ *
+ * The packets are identical on x86-32 and x86-64, but have different
+ * alignment. Which means that 'sizeof()' will give different results.
+ * Fix it up for the case of running 32-bit user mode on a 64-bit kernel.
+ */
+static noinline size_t autofs_v5_packet_size(struct autofs_sb_info *sbi)
+ size_t pktsz = sizeof(struct autofs_v5_packet);
+#if defined(CONFIG_X86_64) && defined(CONFIG_COMPAT)
+ if (sbi->compat_daemon > 0)
+ pktsz -= 4;
+ return pktsz;

static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
struct autofs_wait_queue *wq,
@@ -155,8 +173,7 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
struct autofs_v5_packet *packet = &pkt.v5_pkt.v5_packet;

- pktsz = sizeof(*packet);
+ pktsz = autofs_v5_packet_size(sbi);
packet->wait_queue_token = wq->wait_queue_token;
packet->len = wq->name.len;
memcpy(packet->name, wq->, wq->name.len);
 \ /
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