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authorLinus Torvalds <torvalds@linux-foundation.org>2016-08-19 12:47:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-19 12:47:01 -0700
commit6040e57658eee6eb1315a26119101ca832d1f854 (patch)
treeddf7a0567b1b57c579c51f13d29e790bd046152b /fs
parent8cc9dddd381d94f1cbeed62af275a8764583b349 (diff)
downloadlinux-6040e57658eee6eb1315a26119101ca832d1f854.tar.bz2
Make the hardened user-copy code depend on having a hardened allocator
The kernel test robot reported a usercopy failure in the new hardened sanity checks, due to a page-crossing copy of the FPU state into the task structure. This happened because the kernel test robot was testing with SLOB, which doesn't actually do the required book-keeping for slab allocations, and as a result the hardening code didn't realize that the task struct allocation was one single allocation - and the sanity checks fail. Since SLOB doesn't even claim to support hardening (and you really shouldn't use it), the straightforward solution is to just make the usercopy hardening code depend on the allocator supporting it. Reported-by: kernel test robot <xiaolong.ye@intel.com> Cc: Kees Cook <keescook@chromium.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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