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| author | Andy Lutomirski <luto@amacapital.net> | 2015-01-22 11:27:58 -0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-01-22 21:11:06 +0100 |
| commit | e30ab185c490e9a9381385529e0fd32f0a399495 (patch) | |
| tree | cc5524baa777da7cc0b168f4d4649e0029fd4045 /arch/x86/kernel/tls.c | |
| parent | e9d1b4f3c60997fe197bf0243cb4a41a44387a88 (diff) | |
| download | op-kernel-dev-e30ab185c490e9a9381385529e0fd32f0a399495.zip op-kernel-dev-e30ab185c490e9a9381385529e0fd32f0a399495.tar.gz | |
x86, tls, ldt: Stop checking lm in LDT_empty
32-bit programs don't have an lm bit in their ABI, so they can't
reliably cause LDT_empty to return true without resorting to memset.
They shouldn't need to do this.
This should fix a longstanding, if minor, issue in all 64-bit kernels
as well as a potential regression in the TLS hardening code.
Fixes: 41bdc78544b8 x86/tls: Validate TLS entries to protect espfix
Cc: stable@vger.kernel.org
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Cc: torvalds@linux-foundation.org
Link: http://lkml.kernel.org/r/72a059de55e86ad5e2935c80aa91880ddf19d07c.1421954363.git.luto@amacapital.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/tls.c')
0 files changed, 0 insertions, 0 deletions
