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UPSTREAM: mm/tlb: Provide default nmi_uaccess_okay()

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x86 has an nmi_uaccess_okay(), but other architectures do not.
Arch-independent code might need to know whether access to user
addresses is ok in an NMI context or in other code whose execution
context is unknown.  Specifically, this function is needed for
bpf_probe_write_user().

Add a default implementation of nmi_uaccess_okay() for architectures
that do not have such a function.

Change-Id: Ie710d06700a2c5b392bff0dbc82798f9c0d985cc
Signed-off-by: Nadav Amit <namit@vmware.com>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <akpm@linux-foundation.org>
Cc: <ard.biesheuvel@linaro.org>
Cc: <deneen.t.dock@intel.com>
Cc: <kernel-hardening@lists.openwall.com>
Cc: <kristen@linux.intel.com>
Cc: <linux_dti@icloud.com>
Cc: <will.deacon@arm.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190426001143.4983-23-namit@vmware.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Nadav Amit 2019-04-25 17:11:42 -07:00 • committed by basamaryan
commit f1632e4deb
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1 changed files with 9 additions and 0 deletions
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9
include/asm-generic/tlb.h
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@ -26,6 +26,15 @@
# define nmi_uaccess_okay() true
#endif
/*
* Blindly accessing user memory from NMI context can be dangerous
* if we're in the middle of switching the current user task or switching
* the loaded mm.
*/
#ifndef nmi_uaccess_okay
# define nmi_uaccess_okay() true
#endif
#ifdef CONFIG_MMU
/*