* [PATCH] x86: Remove the arch_calc_vm_prot_bits() macro from the uapi
@ 2023-07-06 19:02 Thomas Huth
2023-07-06 20:22 ` Arnd Bergmann
2023-07-07 9:29 ` Nicolas Schier
0 siblings, 2 replies; 6+ messages in thread
From: Thomas Huth @ 2023-07-06 19:02 UTC (permalink / raw)
To: Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Cc: x86, H. Peter Anvin, Arnd Bergmann, Nicolas Schier,
Masahiro Yamada, linux-kernel
The arch_calc_vm_prot_bits() macro uses VM_PKEY_BIT0 etc. which are
not part of the uapi, so the macro is completely useless for userspace.
It is also hidden behind the CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
config switch which we shouldn't expose to userspace. Thus let's move
this macro into a new internal header instead.
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
arch/x86/include/asm/mman.h | 15 +++++++++++++++
arch/x86/include/uapi/asm/mman.h | 8 --------
| 1 -
3 files changed, 15 insertions(+), 9 deletions(-)
create mode 100644 arch/x86/include/asm/mman.h
diff --git a/arch/x86/include/asm/mman.h b/arch/x86/include/asm/mman.h
new file mode 100644
index 0000000000000..12b820259b9f3
--- /dev/null
+++ b/arch/x86/include/asm/mman.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_MMAN_H__
+#define __ASM_MMAN_H__
+
+#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
+#define arch_calc_vm_prot_bits(prot, key) ( \
+ ((key) & 0x1 ? VM_PKEY_BIT0 : 0) | \
+ ((key) & 0x2 ? VM_PKEY_BIT1 : 0) | \
+ ((key) & 0x4 ? VM_PKEY_BIT2 : 0) | \
+ ((key) & 0x8 ? VM_PKEY_BIT3 : 0))
+#endif
+
+#include <uapi/asm/mman.h>
+
+#endif /* __ASM_MMAN_H__ */
diff --git a/arch/x86/include/uapi/asm/mman.h b/arch/x86/include/uapi/asm/mman.h
index 775dbd3aff736..a72e4f3e13b17 100644
--- a/arch/x86/include/uapi/asm/mman.h
+++ b/arch/x86/include/uapi/asm/mman.h
@@ -4,14 +4,6 @@
#define MAP_32BIT 0x40 /* only give out 32bit addresses */
-#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
-#define arch_calc_vm_prot_bits(prot, key) ( \
- ((key) & 0x1 ? VM_PKEY_BIT0 : 0) | \
- ((key) & 0x2 ? VM_PKEY_BIT1 : 0) | \
- ((key) & 0x4 ? VM_PKEY_BIT2 : 0) | \
- ((key) & 0x8 ? VM_PKEY_BIT3 : 0))
-#endif
-
#include <asm-generic/mman.h>
#endif /* _ASM_X86_MMAN_H */
--git a/scripts/headers_install.sh b/scripts/headers_install.sh
index afdddc82f02b3..56d3c338d91d7 100755
--- a/scripts/headers_install.sh
+++ b/scripts/headers_install.sh
@@ -81,7 +81,6 @@ arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_NO
arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_SUPPORT
arch/x86/include/uapi/asm/auxvec.h:CONFIG_IA32_EMULATION
arch/x86/include/uapi/asm/auxvec.h:CONFIG_X86_64
-arch/x86/include/uapi/asm/mman.h:CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
"
for c in $configs
--
2.39.3
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH] x86: Remove the arch_calc_vm_prot_bits() macro from the uapi
2023-07-06 19:02 [PATCH] x86: Remove the arch_calc_vm_prot_bits() macro from the uapi Thomas Huth
@ 2023-07-06 20:22 ` Arnd Bergmann
2023-07-06 20:30 ` Dave Hansen
2023-07-07 9:29 ` Nicolas Schier
1 sibling, 1 reply; 6+ messages in thread
From: Arnd Bergmann @ 2023-07-06 20:22 UTC (permalink / raw)
To: Thomas Huth, Thomas Gleixner, Ingo Molnar, Borislav Petkov,
Dave Hansen
Cc: x86, H. Peter Anvin, Nicolas Schier, Masahiro Yamada,
linux-kernel
On Thu, Jul 6, 2023, at 21:02, Thomas Huth wrote:
> The arch_calc_vm_prot_bits() macro uses VM_PKEY_BIT0 etc. which are
> not part of the uapi, so the macro is completely useless for userspace.
> It is also hidden behind the CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
> config switch which we shouldn't expose to userspace. Thus let's move
> this macro into a new internal header instead.
>
> Signed-off-by: Thomas Huth <thuth@redhat.com>
Fixes: 8f62c883222c9 ("x86/mm/pkeys: Add arch-specific VMA protection bits")
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
It looks like this was introduced right after the uapi split,
and probably is the result of an incorrect rebase.
Arnd
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] x86: Remove the arch_calc_vm_prot_bits() macro from the uapi
2023-07-06 20:22 ` Arnd Bergmann
@ 2023-07-06 20:30 ` Dave Hansen
2023-07-06 20:36 ` Arnd Bergmann
2023-07-07 6:48 ` Thomas Huth
0 siblings, 2 replies; 6+ messages in thread
From: Dave Hansen @ 2023-07-06 20:30 UTC (permalink / raw)
To: Arnd Bergmann, Thomas Huth, Thomas Gleixner, Ingo Molnar,
Borislav Petkov, Dave Hansen
Cc: x86, H. Peter Anvin, Nicolas Schier, Masahiro Yamada,
linux-kernel
On 7/6/23 13:22, Arnd Bergmann wrote:
> On Thu, Jul 6, 2023, at 21:02, Thomas Huth wrote:
>> The arch_calc_vm_prot_bits() macro uses VM_PKEY_BIT0 etc. which are
>> not part of the uapi, so the macro is completely useless for userspace.
>> It is also hidden behind the CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
>> config switch which we shouldn't expose to userspace. Thus let's move
>> this macro into a new internal header instead.
>>
>> Signed-off-by: Thomas Huth <thuth@redhat.com>
> Fixes: 8f62c883222c9 ("x86/mm/pkeys: Add arch-specific VMA protection bits")
> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
>
> It looks like this was introduced right after the uapi split,
> and probably is the result of an incorrect rebase.
Yeah, I bet I just glossed over the "uapi" in the path.
Is this causing any real problems? Or is it OK to just send it along
during the next merge window with other random cleanups?
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] x86: Remove the arch_calc_vm_prot_bits() macro from the uapi
2023-07-06 20:30 ` Dave Hansen
@ 2023-07-06 20:36 ` Arnd Bergmann
2023-07-07 6:48 ` Thomas Huth
1 sibling, 0 replies; 6+ messages in thread
From: Arnd Bergmann @ 2023-07-06 20:36 UTC (permalink / raw)
To: Dave Hansen, Thomas Huth, Thomas Gleixner, Ingo Molnar,
Borislav Petkov, Dave Hansen
Cc: x86, H. Peter Anvin, Nicolas Schier, Masahiro Yamada,
linux-kernel
On Thu, Jul 6, 2023, at 22:30, Dave Hansen wrote:
> On 7/6/23 13:22, Arnd Bergmann wrote:
>> On Thu, Jul 6, 2023, at 21:02, Thomas Huth wrote:
>>> The arch_calc_vm_prot_bits() macro uses VM_PKEY_BIT0 etc. which are
>>> not part of the uapi, so the macro is completely useless for userspace.
>>> It is also hidden behind the CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
>>> config switch which we shouldn't expose to userspace. Thus let's move
>>> this macro into a new internal header instead.
>>>
>>> Signed-off-by: Thomas Huth <thuth@redhat.com>
>> Fixes: 8f62c883222c9 ("x86/mm/pkeys: Add arch-specific VMA protection bits")
>> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
>>
>> It looks like this was introduced right after the uapi split,
>> and probably is the result of an incorrect rebase.
>
> Yeah, I bet I just glossed over the "uapi" in the path.
>
> Is this causing any real problems? Or is it OK to just send it along
> during the next merge window with other random cleanups?
It's pretty harmless, there are currently 12 remaining CONFIG_*
#ifdef checks in uapi headers, which scripts/headers_install.sh
has an exception for, and unlike some of the others, this one has
no relevance for the actual uapi.
Ultimately, the goal is to remove the list of known instances
from the script and just warn about all of them when new ones
get added, but it only becomes urgent when we get to everything
else.
Arnd
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] x86: Remove the arch_calc_vm_prot_bits() macro from the uapi
2023-07-06 20:30 ` Dave Hansen
2023-07-06 20:36 ` Arnd Bergmann
@ 2023-07-07 6:48 ` Thomas Huth
1 sibling, 0 replies; 6+ messages in thread
From: Thomas Huth @ 2023-07-07 6:48 UTC (permalink / raw)
To: Dave Hansen, Arnd Bergmann, Thomas Gleixner, Ingo Molnar,
Borislav Petkov, Dave Hansen
Cc: x86, H. Peter Anvin, Nicolas Schier, Masahiro Yamada,
linux-kernel
On 06/07/2023 22.30, Dave Hansen wrote:
> On 7/6/23 13:22, Arnd Bergmann wrote:
>> On Thu, Jul 6, 2023, at 21:02, Thomas Huth wrote:
>>> The arch_calc_vm_prot_bits() macro uses VM_PKEY_BIT0 etc. which are
>>> not part of the uapi, so the macro is completely useless for userspace.
>>> It is also hidden behind the CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
>>> config switch which we shouldn't expose to userspace. Thus let's move
>>> this macro into a new internal header instead.
>>>
>>> Signed-off-by: Thomas Huth <thuth@redhat.com>
>> Fixes: 8f62c883222c9 ("x86/mm/pkeys: Add arch-specific VMA protection bits")
>> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
>>
>> It looks like this was introduced right after the uapi split,
>> and probably is the result of an incorrect rebase.
>
> Yeah, I bet I just glossed over the "uapi" in the path.
>
> Is this causing any real problems? Or is it OK to just send it along
> during the next merge window with other random cleanups?
As Arnd already said, it's not a real problem - I just came across this file
while looking at the list in scripts/headers_install.sh.
Thomas
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] x86: Remove the arch_calc_vm_prot_bits() macro from the uapi
2023-07-06 19:02 [PATCH] x86: Remove the arch_calc_vm_prot_bits() macro from the uapi Thomas Huth
2023-07-06 20:22 ` Arnd Bergmann
@ 2023-07-07 9:29 ` Nicolas Schier
1 sibling, 0 replies; 6+ messages in thread
From: Nicolas Schier @ 2023-07-07 9:29 UTC (permalink / raw)
To: Thomas Huth
Cc: Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, x86,
H. Peter Anvin, Arnd Bergmann, Masahiro Yamada, linux-kernel
On Thu, Jul 06, 2023 at 09:02:17PM +0200 Thomas Huth wrote:
> The arch_calc_vm_prot_bits() macro uses VM_PKEY_BIT0 etc. which are
> not part of the uapi, so the macro is completely useless for userspace.
> It is also hidden behind the CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
> config switch which we shouldn't expose to userspace. Thus let's move
> this macro into a new internal header instead.
>
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
Thanks for fixing this config leakage.
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
> arch/x86/include/asm/mman.h | 15 +++++++++++++++
> arch/x86/include/uapi/asm/mman.h | 8 --------
> scripts/headers_install.sh | 1 -
> 3 files changed, 15 insertions(+), 9 deletions(-)
> create mode 100644 arch/x86/include/asm/mman.h
>
> diff --git a/arch/x86/include/asm/mman.h b/arch/x86/include/asm/mman.h
> new file mode 100644
> index 0000000000000..12b820259b9f3
> --- /dev/null
> +++ b/arch/x86/include/asm/mman.h
> @@ -0,0 +1,15 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __ASM_MMAN_H__
> +#define __ASM_MMAN_H__
> +
> +#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
> +#define arch_calc_vm_prot_bits(prot, key) ( \
> + ((key) & 0x1 ? VM_PKEY_BIT0 : 0) | \
> + ((key) & 0x2 ? VM_PKEY_BIT1 : 0) | \
> + ((key) & 0x4 ? VM_PKEY_BIT2 : 0) | \
> + ((key) & 0x8 ? VM_PKEY_BIT3 : 0))
> +#endif
> +
> +#include <uapi/asm/mman.h>
> +
> +#endif /* __ASM_MMAN_H__ */
> diff --git a/arch/x86/include/uapi/asm/mman.h b/arch/x86/include/uapi/asm/mman.h
> index 775dbd3aff736..a72e4f3e13b17 100644
> --- a/arch/x86/include/uapi/asm/mman.h
> +++ b/arch/x86/include/uapi/asm/mman.h
> @@ -4,14 +4,6 @@
>
> #define MAP_32BIT 0x40 /* only give out 32bit addresses */
>
> -#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
> -#define arch_calc_vm_prot_bits(prot, key) ( \
> - ((key) & 0x1 ? VM_PKEY_BIT0 : 0) | \
> - ((key) & 0x2 ? VM_PKEY_BIT1 : 0) | \
> - ((key) & 0x4 ? VM_PKEY_BIT2 : 0) | \
> - ((key) & 0x8 ? VM_PKEY_BIT3 : 0))
> -#endif
> -
> #include <asm-generic/mman.h>
>
> #endif /* _ASM_X86_MMAN_H */
> diff --git a/scripts/headers_install.sh b/scripts/headers_install.sh
> index afdddc82f02b3..56d3c338d91d7 100755
> --- a/scripts/headers_install.sh
> +++ b/scripts/headers_install.sh
> @@ -81,7 +81,6 @@ arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_NO
> arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_SUPPORT
> arch/x86/include/uapi/asm/auxvec.h:CONFIG_IA32_EMULATION
> arch/x86/include/uapi/asm/auxvec.h:CONFIG_X86_64
> -arch/x86/include/uapi/asm/mman.h:CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
> "
>
> for c in $configs
> --
> 2.39.3
--
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^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2023-07-07 9:31 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2023-07-06 19:02 [PATCH] x86: Remove the arch_calc_vm_prot_bits() macro from the uapi Thomas Huth
2023-07-06 20:22 ` Arnd Bergmann
2023-07-06 20:30 ` Dave Hansen
2023-07-06 20:36 ` Arnd Bergmann
2023-07-07 6:48 ` Thomas Huth
2023-07-07 9:29 ` Nicolas Schier
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