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| Started by | Mikko Rapeli <mikko.rapeli@iki.fi> |
|---|---|
| First post | 2015-09-02 21:40 +0200 |
| Last post | 2015-09-05 09:40 +0200 |
| Articles | 6 — 2 participants |
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Re: [PATCH 94/98] HACK arch/x86/include/uapi/asm/sigcontext32.h: remove _fpx_sw_bytes from union Mikko Rapeli <mikko.rapeli@iki.fi> - 2015-09-02 21:40 +0200
[PATCH] x86/headers: Fix (old) header file dependency bug in uapi/asm/sigcontext32.h Ingo Molnar <mingo@kernel.org> - 2015-09-03 09:50 +0200
Re: [PATCH] x86/headers: Fix (old) header file dependency bug in uapi/asm/sigcontext32.h Mikko Rapeli <mikko.rapeli@iki.fi> - 2015-09-04 09:20 +0200
Re: [PATCH] x86/headers: Fix (old) header file dependency bug in uapi/asm/sigcontext32.h Ingo Molnar <mingo@kernel.org> - 2015-09-04 11:00 +0200
Re: [PATCH] x86/headers: Fix (old) header file dependency bug in uapi/asm/sigcontext32.h Mikko Rapeli <mikko.rapeli@iki.fi> - 2015-09-04 14:20 +0200
Re: [PATCH] x86/headers: Fix (old) header file dependency bug in uapi/asm/sigcontext32.h Ingo Molnar <mingo@kernel.org> - 2015-09-05 09:40 +0200
| From | Mikko Rapeli <mikko.rapeli@iki.fi> |
|---|---|
| Date | 2015-09-02 21:40 +0200 |
| Subject | Re: [PATCH 94/98] HACK arch/x86/include/uapi/asm/sigcontext32.h: remove _fpx_sw_bytes from union |
| Message-ID | <q4m30-68s-9@gated-at.bofh.it> |
Hi Ingo, Thomas and Peter,
Do you have any pointers for me how arch/x86/include/uapi/asm/sigcontext32.h
could be fixed to also compile in userspace? Is definition of _fpx_sw_bytes
or _fpstate_ia32 even needed there?
Instructions to reproduce the userspace build failure are here:
https://lkml.org/lkml/2015/5/30/98
-Mikko
On Sat, May 30, 2015 at 05:39:26PM +0200, Mikko Rapeli wrote:
> I have no idea what I'm doing but this fixes header file compilation in
> userspace:
>
> error: field ‘sw_reserved’ has incomplete type
> struct _fpx_sw_bytes sw_reserved;
>
> Signed-off-by: Mikko Rapeli <mikko.rapeli@iki.fi>
> ---
> arch/x86/include/uapi/asm/sigcontext32.h | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/arch/x86/include/uapi/asm/sigcontext32.h b/arch/x86/include/uapi/asm/sigcontext32.h
> index ad1478c..ceaaa78 100644
> --- a/arch/x86/include/uapi/asm/sigcontext32.h
> +++ b/arch/x86/include/uapi/asm/sigcontext32.h
> @@ -45,7 +45,6 @@ struct _fpstate_ia32 {
> __u32 padding[44];
> union {
> __u32 padding2[12];
> - struct _fpx_sw_bytes sw_reserved;
> };
> };
>
> --
> 2.1.4
>
--
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| From | Ingo Molnar <mingo@kernel.org> |
|---|---|
| Date | 2015-09-03 09:50 +0200 |
| Subject | [PATCH] x86/headers: Fix (old) header file dependency bug in uapi/asm/sigcontext32.h |
| Message-ID | <q4xrs-5yf-11@gated-at.bofh.it> |
| In reply to | #1217822 |
* Mikko Rapeli <mikko.rapeli@iki.fi> wrote:
> Hi Ingo, Thomas and Peter,
>
> Do you have any pointers for me how arch/x86/include/uapi/asm/sigcontext32.h
> could be fixed to also compile in userspace? Is definition of _fpx_sw_bytes
> or _fpstate_ia32 even needed there?
>
> Instructions to reproduce the userspace build failure are here:
> https://lkml.org/lkml/2015/5/30/98
Yeah, so this is a real bug in the headers, good find.
Also note that somewhat luckily your testcase is artificial, no real user-space
code can contain that code at the moment because the header never built standalone
in the past either AFAICS.
So it's an old header file dependency bug, to make it build in user-space you need
to do this workaround:
#include <asm/sigcontext.h>
#include <asm/sigcontext32.h>
If you only include sigcontext32.h:
#include <asm/sigcontext32.h>
it will fail to build.
To fix the bug:
> > --- a/arch/x86/include/uapi/asm/sigcontext32.h
> > +++ b/arch/x86/include/uapi/asm/sigcontext32.h
> > @@ -45,7 +45,6 @@ struct _fpstate_ia32 {
> > __u32 padding[44];
> > union {
> > __u32 padding2[12];
> > - struct _fpx_sw_bytes sw_reserved;
> > };
> > };
No, those fields are real and compat sigframe handling user-space might be relying
on them.
Does the fix below work for you?
Thanks,
Ingo
=========================>
From 0bcdebb70e1ae246139df71acfa744ab1629d877 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@kernel.org>
Date: Thu, 3 Sep 2015 09:35:19 +0200
Subject: [PATCH] x86/headers: Fix (old) header file dependency bug in uapi/asm/sigcontext32.h
Mikko Rapeli reported that the following standalone user-space header does not compile:
#include <asm/sigcontext32.h>
Due to undefined 'struct __fpx_sw_bytes' which is defined in asm/sigcontext.h.
The following header order works:
#include <asm/sigcontext.h>
#include <asm/sigcontext32.h>
and that's probably how everyone's been using these headers for the past decade or
so, but it's a legit header file dependency bug, so include asm/sigcontext.h in
sigcontext32.h to allow it to be built standlone.
Reported-by: Mikko Rapeli <mikko.rapeli@iki.fi>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/uapi/asm/sigcontext32.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/x86/include/uapi/asm/sigcontext32.h b/arch/x86/include/uapi/asm/sigcontext32.h
index ad1478c4ae12..ff7826c41a1c 100644
--- a/arch/x86/include/uapi/asm/sigcontext32.h
+++ b/arch/x86/include/uapi/asm/sigcontext32.h
@@ -3,6 +3,8 @@
#include <linux/types.h>
+#include <asm/sigcontext.h>
+
/* signal context for 32bit programs. */
#define X86_FXSR_MAGIC 0x0000
--
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| From | Mikko Rapeli <mikko.rapeli@iki.fi> |
|---|---|
| Date | 2015-09-04 09:20 +0200 |
| Subject | Re: [PATCH] x86/headers: Fix (old) header file dependency bug in uapi/asm/sigcontext32.h |
| Message-ID | <q4TrY-3vn-15@gated-at.bofh.it> |
| In reply to | #1218081 |
On Thu, Sep 03, 2015 at 09:42:32AM +0200, Ingo Molnar wrote:
>
> * Mikko Rapeli <mikko.rapeli@iki.fi> wrote:
>
> > Hi Ingo, Thomas and Peter,
> >
> > Do you have any pointers for me how arch/x86/include/uapi/asm/sigcontext32.h
> > could be fixed to also compile in userspace? Is definition of _fpx_sw_bytes
> > or _fpstate_ia32 even needed there?
> >
> > Instructions to reproduce the userspace build failure are here:
> > https://lkml.org/lkml/2015/5/30/98
>
> Yeah, so this is a real bug in the headers, good find.
>
> Also note that somewhat luckily your testcase is artificial, no real user-space
> code can contain that code at the moment because the header never built standalone
> in the past either AFAICS.
>
> So it's an old header file dependency bug, to make it build in user-space you need
> to do this workaround:
>
> #include <asm/sigcontext.h>
> #include <asm/sigcontext32.h>
>
> If you only include sigcontext32.h:
>
> #include <asm/sigcontext32.h>
>
> it will fail to build.
>
> To fix the bug:
>
> > > --- a/arch/x86/include/uapi/asm/sigcontext32.h
> > > +++ b/arch/x86/include/uapi/asm/sigcontext32.h
> > > @@ -45,7 +45,6 @@ struct _fpstate_ia32 {
> > > __u32 padding[44];
> > > union {
> > > __u32 padding2[12];
> > > - struct _fpx_sw_bytes sw_reserved;
> > > };
> > > };
>
> No, those fields are real and compat sigframe handling user-space might be relying
> on them.
>
> Does the fix below work for you?
Unfortunately no:
cc -Wall -c -nostdinc -I /usr/lib/gcc/i586-linux-gnu/5/include -I /usr/lib/gcc/i
586-linux-gnu/5/include-fixed -I . -I ../headers_compile_test_include -I ../head
ers_compile_test_include/i586-linux-gnu ./asm/sigcontext32.c
In file included from ./asm/sigcontext32.c:1:0:
./asm/sigcontext32.h:12:8: error: redefinition of ‘struct _fpreg’
struct _fpreg {
^
In file included from ./asm/sigcontext32.h:6:0,
from ./asm/sigcontext32.c:1:
./asm/sigcontext.h:56:8: note: originally defined here
struct _fpreg {
^
In file included from ./asm/sigcontext32.c:1:0:
./asm/sigcontext32.h:17:8: error: redefinition of ‘struct _fpxreg’
struct _fpxreg {
^
In file included from ./asm/sigcontext32.h:6:0,
from ./asm/sigcontext32.c:1:
./asm/sigcontext.h:61:8: note: originally defined here
struct _fpxreg {
^
In file included from ./asm/sigcontext32.c:1:0:
./asm/sigcontext32.h:23:8: error: redefinition of ‘struct _xmmreg’
struct _xmmreg {
^
In file included from ./asm/sigcontext32.h:6:0,
from ./asm/sigcontext32.c:1:
./asm/sigcontext.h:67:8: note: originally defined here
struct _xmmreg {
^
FAILED: ./asm/sigcontext32.h
I guess this was the reason why I ended with the hack.
-Mikko
> Thanks,
>
> Ingo
>
> =========================>
> >From 0bcdebb70e1ae246139df71acfa744ab1629d877 Mon Sep 17 00:00:00 2001
> From: Ingo Molnar <mingo@kernel.org>
> Date: Thu, 3 Sep 2015 09:35:19 +0200
> Subject: [PATCH] x86/headers: Fix (old) header file dependency bug in uapi/asm/sigcontext32.h
>
> Mikko Rapeli reported that the following standalone user-space header does not compile:
>
> #include <asm/sigcontext32.h>
>
> Due to undefined 'struct __fpx_sw_bytes' which is defined in asm/sigcontext.h.
>
> The following header order works:
>
> #include <asm/sigcontext.h>
> #include <asm/sigcontext32.h>
>
> and that's probably how everyone's been using these headers for the past decade or
> so, but it's a legit header file dependency bug, so include asm/sigcontext.h in
> sigcontext32.h to allow it to be built standlone.
>
> Reported-by: Mikko Rapeli <mikko.rapeli@iki.fi>
> Cc: Andy Lutomirski <luto@amacapital.net>
> Cc: Borislav Petkov <bp@alien8.de>
> Cc: Brian Gerst <brgerst@gmail.com>
> Cc: Denys Vlasenko <dvlasenk@redhat.com>
> Cc: H. Peter Anvin <hpa@zytor.com>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Ingo Molnar <mingo@kernel.org>
> ---
> arch/x86/include/uapi/asm/sigcontext32.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/x86/include/uapi/asm/sigcontext32.h b/arch/x86/include/uapi/asm/sigcontext32.h
> index ad1478c4ae12..ff7826c41a1c 100644
> --- a/arch/x86/include/uapi/asm/sigcontext32.h
> +++ b/arch/x86/include/uapi/asm/sigcontext32.h
> @@ -3,6 +3,8 @@
>
> #include <linux/types.h>
>
> +#include <asm/sigcontext.h>
> +
> /* signal context for 32bit programs. */
>
> #define X86_FXSR_MAGIC 0x0000
>
--
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| From | Ingo Molnar <mingo@kernel.org> |
|---|---|
| Date | 2015-09-04 11:00 +0200 |
| Subject | Re: [PATCH] x86/headers: Fix (old) header file dependency bug in uapi/asm/sigcontext32.h |
| Message-ID | <q4V0L-5zg-33@gated-at.bofh.it> |
| In reply to | #1218701 |
* Mikko Rapeli <mikko.rapeli@iki.fi> wrote:
> On Thu, Sep 03, 2015 at 09:42:32AM +0200, Ingo Molnar wrote:
> >
> > * Mikko Rapeli <mikko.rapeli@iki.fi> wrote:
> >
> > > Hi Ingo, Thomas and Peter,
> > >
> > > Do you have any pointers for me how arch/x86/include/uapi/asm/sigcontext32.h
> > > could be fixed to also compile in userspace? Is definition of _fpx_sw_bytes
> > > or _fpstate_ia32 even needed there?
> > >
> > > Instructions to reproduce the userspace build failure are here:
> > > https://lkml.org/lkml/2015/5/30/98
> >
> > Yeah, so this is a real bug in the headers, good find.
> >
> > Also note that somewhat luckily your testcase is artificial, no real user-space
> > code can contain that code at the moment because the header never built standalone
> > in the past either AFAICS.
> >
> > So it's an old header file dependency bug, to make it build in user-space you need
> > to do this workaround:
> >
> > #include <asm/sigcontext.h>
> > #include <asm/sigcontext32.h>
> >
> > If you only include sigcontext32.h:
> >
> > #include <asm/sigcontext32.h>
> >
> > it will fail to build.
> >
> > To fix the bug:
> >
> > > > --- a/arch/x86/include/uapi/asm/sigcontext32.h
> > > > +++ b/arch/x86/include/uapi/asm/sigcontext32.h
> > > > @@ -45,7 +45,6 @@ struct _fpstate_ia32 {
> > > > __u32 padding[44];
> > > > union {
> > > > __u32 padding2[12];
> > > > - struct _fpx_sw_bytes sw_reserved;
> > > > };
> > > > };
> >
> > No, those fields are real and compat sigframe handling user-space might be relying
> > on them.
> >
> > Does the fix below work for you?
>
> Unfortunately no:
>
> cc -Wall -c -nostdinc -I /usr/lib/gcc/i586-linux-gnu/5/include -I /usr/lib/gcc/i
> 586-linux-gnu/5/include-fixed -I . -I ../headers_compile_test_include -I ../head
> ers_compile_test_include/i586-linux-gnu ./asm/sigcontext32.c
> In file included from ./asm/sigcontext32.c:1:0:
> ./asm/sigcontext32.h:12:8: error: redefinition of ‘struct _fpreg’
> struct _fpreg {
> ^
> In file included from ./asm/sigcontext32.h:6:0,
> from ./asm/sigcontext32.c:1:
> ./asm/sigcontext.h:56:8: note: originally defined here
> struct _fpreg {
> ^
> In file included from ./asm/sigcontext32.c:1:0:
> ./asm/sigcontext32.h:17:8: error: redefinition of ‘struct _fpxreg’
> struct _fpxreg {
> ^
> In file included from ./asm/sigcontext32.h:6:0,
> from ./asm/sigcontext32.c:1:
> ./asm/sigcontext.h:61:8: note: originally defined here
> struct _fpxreg {
> ^
> In file included from ./asm/sigcontext32.c:1:0:
> ./asm/sigcontext32.h:23:8: error: redefinition of ‘struct _xmmreg’
> struct _xmmreg {
> ^
> In file included from ./asm/sigcontext32.h:6:0,
> from ./asm/sigcontext32.c:1:
> ./asm/sigcontext.h:67:8: note: originally defined here
> struct _xmmreg {
> ^
> FAILED: ./asm/sigcontext32.h
>
> I guess this was the reason why I ended with the hack.
sigcontext32.h is a 64-bit only header (for compat functionality), and you are
trying to build this on i386, right?
In theory we could unify them mostly, the two structures match mostly, except that
'_fpstate_ia32::padding' is named 'padding1' in _fpstate, and there's also some
legacy uglies wrt. user-space sigcontext definitions.
So this either gets cleaned up properly, with the legacy hacks/wrappers clearly
isolated, or we could state that you shouldn't build 64-bit headers in 32-bit
environments.
Thanks,
Ingo
--
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| From | Mikko Rapeli <mikko.rapeli@iki.fi> |
|---|---|
| Date | 2015-09-04 14:20 +0200 |
| Subject | Re: [PATCH] x86/headers: Fix (old) header file dependency bug in uapi/asm/sigcontext32.h |
| Message-ID | <q4Y8j-1MD-25@gated-at.bofh.it> |
| In reply to | #1218776 |
On Fri, Sep 04, 2015 at 10:58:31AM +0200, Ingo Molnar wrote:
>
> * Mikko Rapeli <mikko.rapeli@iki.fi> wrote:
>
> > On Thu, Sep 03, 2015 at 09:42:32AM +0200, Ingo Molnar wrote:
> > >
> > > * Mikko Rapeli <mikko.rapeli@iki.fi> wrote:
> > >
> > > > Hi Ingo, Thomas and Peter,
> > > >
> > > > Do you have any pointers for me how arch/x86/include/uapi/asm/sigcontext32.h
> > > > could be fixed to also compile in userspace? Is definition of _fpx_sw_bytes
> > > > or _fpstate_ia32 even needed there?
> > > >
> > > > Instructions to reproduce the userspace build failure are here:
> > > > https://lkml.org/lkml/2015/5/30/98
> > >
> > > Yeah, so this is a real bug in the headers, good find.
> > >
> > > Also note that somewhat luckily your testcase is artificial, no real user-space
> > > code can contain that code at the moment because the header never built standalone
> > > in the past either AFAICS.
> > >
> > > So it's an old header file dependency bug, to make it build in user-space you need
> > > to do this workaround:
> > >
> > > #include <asm/sigcontext.h>
> > > #include <asm/sigcontext32.h>
> > >
> > > If you only include sigcontext32.h:
> > >
> > > #include <asm/sigcontext32.h>
> > >
> > > it will fail to build.
> > >
> > > To fix the bug:
> > >
> > > > > --- a/arch/x86/include/uapi/asm/sigcontext32.h
> > > > > +++ b/arch/x86/include/uapi/asm/sigcontext32.h
> > > > > @@ -45,7 +45,6 @@ struct _fpstate_ia32 {
> > > > > __u32 padding[44];
> > > > > union {
> > > > > __u32 padding2[12];
> > > > > - struct _fpx_sw_bytes sw_reserved;
> > > > > };
> > > > > };
> > >
> > > No, those fields are real and compat sigframe handling user-space might be relying
> > > on them.
> > >
> > > Does the fix below work for you?
> >
> > Unfortunately no:
> >
> > cc -Wall -c -nostdinc -I /usr/lib/gcc/i586-linux-gnu/5/include -I /usr/lib/gcc/i
> > 586-linux-gnu/5/include-fixed -I . -I ../headers_compile_test_include -I ../head
> > ers_compile_test_include/i586-linux-gnu ./asm/sigcontext32.c
> > In file included from ./asm/sigcontext32.c:1:0:
> > ./asm/sigcontext32.h:12:8: error: redefinition of ‘struct _fpreg’
> > struct _fpreg {
> > ^
> > In file included from ./asm/sigcontext32.h:6:0,
> > from ./asm/sigcontext32.c:1:
> > ./asm/sigcontext.h:56:8: note: originally defined here
> > struct _fpreg {
> > ^
> > In file included from ./asm/sigcontext32.c:1:0:
> > ./asm/sigcontext32.h:17:8: error: redefinition of ‘struct _fpxreg’
> > struct _fpxreg {
> > ^
> > In file included from ./asm/sigcontext32.h:6:0,
> > from ./asm/sigcontext32.c:1:
> > ./asm/sigcontext.h:61:8: note: originally defined here
> > struct _fpxreg {
> > ^
> > In file included from ./asm/sigcontext32.c:1:0:
> > ./asm/sigcontext32.h:23:8: error: redefinition of ‘struct _xmmreg’
> > struct _xmmreg {
> > ^
> > In file included from ./asm/sigcontext32.h:6:0,
> > from ./asm/sigcontext32.c:1:
> > ./asm/sigcontext.h:67:8: note: originally defined here
> > struct _xmmreg {
> > ^
> > FAILED: ./asm/sigcontext32.h
> >
> > I guess this was the reason why I ended with the hack.
>
> sigcontext32.h is a 64-bit only header (for compat functionality), and you are
> trying to build this on i386, right?
Yes, i386 32bit.
> In theory we could unify them mostly, the two structures match mostly, except that
> '_fpstate_ia32::padding' is named 'padding1' in _fpstate, and there's also some
> legacy uglies wrt. user-space sigcontext definitions.
>
> So this either gets cleaned up properly, with the legacy hacks/wrappers clearly
> isolated, or we could state that you shouldn't build 64-bit headers in 32-bit
> environments.
Should the sigcontext32.h have some 32bit ifdefs maybe?
I assume that the exported header files should be the same for both 64 and 32
bit i386/x86
-Mikko
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[toc] | [prev] | [next] | [standalone]
| From | Ingo Molnar <mingo@kernel.org> |
|---|---|
| Date | 2015-09-05 09:40 +0200 |
| Subject | Re: [PATCH] x86/headers: Fix (old) header file dependency bug in uapi/asm/sigcontext32.h |
| Message-ID | <q5geR-2go-5@gated-at.bofh.it> |
| In reply to | #1218883 |
* Mikko Rapeli <mikko.rapeli@iki.fi> wrote: > > sigcontext32.h is a 64-bit only header (for compat functionality), and you are > > trying to build this on i386, right? > > Yes, i386 32bit. > > > In theory we could unify them mostly, the two structures match mostly, except that > > '_fpstate_ia32::padding' is named 'padding1' in _fpstate, and there's also some > > legacy uglies wrt. user-space sigcontext definitions. > > > > So this either gets cleaned up properly, with the legacy hacks/wrappers clearly > > isolated, or we could state that you shouldn't build 64-bit headers in 32-bit > > environments. > > Should the sigcontext32.h have some 32bit ifdefs maybe? That gets ugly pretty fast. > I assume that the exported header files should be the same for both 64 and 32 > bit i386/x86 Yes. I have written a small series cleaning up all these header problems - I'll send it out in a few minutes. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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