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| author | Andy Lutomirski <luto@kernel.org> | 2016-07-14 23:22:50 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-07-15 11:26:25 +0300 |
| commit | 360cb4d15567a7eca07a5f3ade6de308bbfb4e70 (patch) | |
| tree | cc75b47581140c5183b78fdb0a66144907d83073 /arch/x86/platform/efi/efi_64.c | |
| parent | af2cf278ef4f9289f88504c3e03cb12f76027575 (diff) | |
| download | linux-360cb4d15567a7eca07a5f3ade6de308bbfb4e70.tar.xz | |
x86/mm/cpa: In populate_pgd(), don't set the PGD entry until it's populated
This avoids pointless races in which another CPU or task might see a
partially populated global PGD entry. These races should normally
be harmless, but, if another CPU propagates the entry via
vmalloc_fault() and then populate_pgd() fails (due to memory allocation
failure, for example), this prevents a use-after-free of the PGD
entry.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
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: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/bf99df27eac6835f687005364bd1fbd89130946c.1468527351.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/platform/efi/efi_64.c')
0 files changed, 0 insertions, 0 deletions