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e0a446ce39
linux/arch/x86/mm
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Andy Lutomirski e0a446ce39 x86/vsyscall: Document odd SIGSEGV error code for vsyscalls 
Even if vsyscall=none, user page faults on the vsyscall page are reported
as though the PROT bit in the error code was set.  Add a comment explaining
why this is probably okay and display the value in the test case.

While at it, explain why the behavior is correct with respect to PKRU.

Modify also the selftest to print the odd error code so that there is a
way to demonstrate the odd behaviour.

If anyone really cares about more accurate emulation, the behaviour could
be changed. But that needs a real good justification.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Kernel Hardening <kernel-hardening@lists.openwall.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/75c91855fd850649ace162eec5495a1354221aaa.1561610354.git.luto@kernel.org
2019-06-28 00:04:39 +02:00
..
amdtopology.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
cpu_entry_area.c x86/exceptions: Split debug IST stack 2019-04-17 15:14:28 +02:00
debug_pagetables.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
dump_pagetables.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441 2019-06-05 17:37:17 +02:00
extable.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
fault.c x86/vsyscall: Document odd SIGSEGV error code for vsyscalls 2019-06-28 00:04:39 +02:00
highmem_32.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
hugetlbpage.c mm: simplify MEMORY_ISOLATION && COMPACTION || CMA into CONTIG_ALLOC 2019-05-14 09:47:47 -07:00
ident_map.c x86/mm: Stop pretending pgtable_l5_enabled is a variable 2018-05-19 11:56:57 +02:00
init_32.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
init_64.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
init.c x86/alternatives: Initialize temporary mm for patching 2019-04-30 12:37:52 +02:00
iomap_32.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
ioremap.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
kasan_init_64.c x86/kasan: Fix boot with 5-level paging and KASAN 2019-06-14 16:37:30 +02:00
kaslr.c x86/mm/KASLR: Compute the size of the vmemmap section properly 2019-06-07 23:12:13 +02:00
kmmio.c x86/mm/kmmio: Make the tracer robust against L1TF 2018-08-08 22:28:34 +02:00
Makefile treewide: prefix header search paths with $(srctree)/ 2019-05-18 11:49:57 +09:00
mem_encrypt_boot.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mem_encrypt_identity.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mem_encrypt.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mm_internal.h x86/mm: Do not use set_{pud, pmd}_safe() when splitting a large page 2019-05-08 19:08:35 +02:00
mmap.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
mmio-mod.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
mpx.c Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-05-19 10:23:24 -07:00
numa_32.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
numa_64.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
numa_emulation.c Merge branch 'core/urgent' into x86/urgent, to pick up objtool fix 2018-11-03 23:42:16 +01:00
numa_internal.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
numa.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
pageattr-test.c x86/mm/cpa: Simplify the code after making cpa->vaddr invariant 2018-12-17 18:54:25 +01:00
pageattr.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
pat_internal.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pat_rbtree.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pat.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
pf_in.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
pf_in.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
pgtable_32.c x86/mm: Rename flush_tlb_single() and flush_tlb_one() to __flush_tlb_one_[user|kernel]() 2018-02-15 01:15:52 +01:00
pgtable.c Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-05-06 16:13:31 -07:00
physaddr.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
physaddr.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pkeys.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288 2019-06-05 17:36:37 +02:00
pti.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295 2019-06-05 17:36:38 +02:00
setup_nx.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
srat.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
testmmiotrace.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
tlb.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00