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x86/mpx: Remove MPX APIs

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MPX is being removed from the kernel due to a lack of support in the
toolchain going forward (gcc).

The first step is to remove the userspace-visible ABIs so that applications
will stop using it.  The most visible one are the enable/disable prctl()s.
Remove them first.

This is the most minimal and least invasive change needed to ensure that
apps stop using MPX with new kernels.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190705175321.DB42F0AD@viggo.jf.intel.com
This commit is contained in:
Dave Hansen 2019-07-05 10:53:21 -07:00 committed by Thomas Gleixner
parent e28df79ae2
commit f240652b60
2 changed files with 3 additions and 15 deletions
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2
include/uapi/linux/prctl.h
View File

@ -181,7 +181,7 @@ struct prctl_mm_map {
#define PR_GET_THP_DISABLE 42
/*
* Tell the kernel to start/stop helping userspace manage bounds tables.
* No longer implemented, but left here to ensure the numbers stay reserved:
*/
#define PR_MPX_ENABLE_MANAGEMENT 43
#define PR_MPX_DISABLE_MANAGEMENT 44

16
kernel/sys.c
View File

@ -103,12 +103,6 @@
#ifndef SET_TSC_CTL
# define SET_TSC_CTL(a) (-EINVAL)
#endif
#ifndef MPX_ENABLE_MANAGEMENT
# define MPX_ENABLE_MANAGEMENT() (-EINVAL)
#endif
#ifndef MPX_DISABLE_MANAGEMENT
# define MPX_DISABLE_MANAGEMENT() (-EINVAL)
#endif
#ifndef GET_FP_MODE
# define GET_FP_MODE(a) (-EINVAL)
#endif
@ -2456,15 +2450,9 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
up_write(&me->mm->mmap_sem);
break;
case PR_MPX_ENABLE_MANAGEMENT:
if (arg2 || arg3 || arg4 || arg5)
return -EINVAL;
error = MPX_ENABLE_MANAGEMENT();
break;
case PR_MPX_DISABLE_MANAGEMENT:
if (arg2 || arg3 || arg4 || arg5)
return -EINVAL;
error = MPX_DISABLE_MANAGEMENT();
break;
/* No longer implemented: */
return -EINVAL;
case PR_SET_FP_MODE:
error = SET_FP_MODE(me, arg2);
break;