| commit | 18032b47adf1db7b7f5fb2d1344e65aafe6417df | [log] [tgz] |
|---|---|---|
| author | Jim Mattson <jmattson@google.com> | Wed Aug 30 21:32:21 2023 -0700 |
| committer | Ingo Molnar <mingo@kernel.org> | Thu Aug 31 23:29:49 2023 +0200 |
| tree | 7847bbd9a68b4544ebd74c07a5e2f5d7c210c0a0 | |
| parent | d87e89c2735772fbed933be0d19e032c1910a51f [diff] |
x86/fpu/xstate: Fix PKRU covert channel When XCR0[9] is set, PKRU can be read and written from userspace with XSAVE and XRSTOR, even when CR4.PKE is clear. Clear XCR0[9] when protection keys are disabled. Reported-by: Tavis Ormandy <taviso@google.com> Signed-off-by: Jim Mattson <jmattson@google.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Link: https://lore.kernel.org/r/20230831043228.1194256-1-jmattson@google.com