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authorAndy Lutomirski <luto@kernel.org>2015-04-26 16:47:59 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-26 17:57:38 -0700
commit61f01dd941ba9e06d2bf05994450ecc3d61b6b8b (patch)
tree3a4a4ef2d5e4d44bb4cb1708f9fc4749e9c9824a /Makefile
parent1190944f4b12203330ac5ed8784f6c181bf26f2d (diff)
downloadlinux-linaro-stable-61f01dd941ba9e06d2bf05994450ecc3d61b6b8b.tar.gz
x86_64, asm: Work around AMD SYSRET SS descriptor attribute issue
AMD CPUs don't reinitialize the SS descriptor on SYSRET, so SYSRET with SS == 0 results in an invalid usermode state in which SS is apparently equal to __USER_DS but causes #SS if used. Work around the issue by setting SS to __KERNEL_DS __switch_to, thus ensuring that SYSRET never happens with SS set to NULL. This was exposed by a recent vDSO cleanup. Fixes: e7d6eefaaa44 x86/vdso32/syscall.S: Do not load __USER32_DS to %ss Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Peter Anvin <hpa@zytor.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Denys Vlasenko <vda.linux@googlemail.com> Cc: Brian Gerst <brgerst@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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