x86/tls: Validate TLS entries to protect espfix

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Installing a 16-bit RW data segment into the GDT defeats espfix.
AFAICT this will not affect glibc, Wine, or dosemu at all.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Cc: stable@vger.kernel.org
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: security@kernel.org <security@kernel.org>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

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Andy Lutomirski 2014-12-04 16:48:16 -08:00 • committed by Ingo Molnar

parent f0905c5a32

commit 41bdc78544

1 changed files with 23 additions and 0 deletions

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arch/x86/kernel/tls.c

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