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c482feefe1
The TSS is a fairly juicy target for exploits, and, now that the TSS is in the cpu_entry_area, it's no longer protected by kASLR. Make it read-only on x86_64. On x86_32, it can't be RO because it's written by the CPU during task switches, and we use a task gate for double faults. I'd also be nervous about errata if we tried to make it RO even on configurations without double fault handling. [ tglx: AMD confirmed that there is no problem on 64-bit with TSS RO. So it's probably safe to assume that it's a non issue, though Intel might have been creative in that area. Still waiting for confirmation. ] Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bpetkov@suse.de> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Laight <David.Laight@aculab.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Eduardo Valentin <eduval@amazon.com> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Juergen Gross <jgross@suse.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Will Deacon <will.deacon@arm.com> Cc: aliguori@amazon.com Cc: daniel.gruss@iaik.tugraz.at Cc: hughd@google.com Cc: keescook@google.com Link: https://lkml.kernel.org/r/20171204150606.733700132@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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.. | ||
.gitignore | ||
atomic64_32.c | ||
atomic64_386_32.S | ||
atomic64_cx8_32.S | ||
cache-smp.c | ||
checksum_32.S | ||
clear_page_64.S | ||
cmdline.c | ||
cmpxchg8b_emu.S | ||
cmpxchg16b_emu.S | ||
copy_page_64.S | ||
copy_user_64.S | ||
cpu.c | ||
csum-copy_64.S | ||
csum-partial_64.c | ||
csum-wrappers_64.c | ||
delay.c | ||
getuser.S | ||
hweight.S | ||
inat.c | ||
insn.c | ||
iomap_copy_64.S | ||
kaslr.c | ||
Makefile | ||
memcpy_32.c | ||
memcpy_64.S | ||
memmove_64.S | ||
memset_64.S | ||
misc.c | ||
mmx_32.c | ||
msr-reg-export.c | ||
msr-reg.S | ||
msr-smp.c | ||
msr.c | ||
putuser.S | ||
rwsem.S | ||
string_32.c | ||
strstr_32.c | ||
usercopy_32.c | ||
usercopy_64.c | ||
usercopy.c | ||
x86-opcode-map.txt |