This series deobfuscates the ptrace/regset handling functions of the x86 FPU code. As a side effect it (should ...) fix the bug Rik reported in:
[PATCH 1/2] x86/fpu: move copyout_from_xsaves bounds check before the copy but it does not handle the other fix yet: [PATCH 2/2] x86/fpu: copy MXCSR & MXCSR_FLAGS with SSE/YMM state ... which needs to be rebased on top of this series. The code got larger, but it is now a lot more standard and a lot easier to understand as well. Only very minimally tested: we should also add various ptrace XSAVES testcases to tools/testing/selftests/x86/. Obviously this will have to be backported as a single group of commits - but I'd rather do that than leave the mess around. Ingo Molnar (14): x86/fpu: Rename copyin_to_xsaves()/copyout_from_xsaves() to copy_user_to_xstate()/copy_xstate_to_user() x86/fpu: Split copy_xstate_to_user() into copy_xstate_to_kernel() & copy_xstate_to_user() x86/fpu: Remove 'ubuf' parameter from the copy_xstate_to_kernel() APIs x86/fpu: Remove 'kbuf' parameter from the copy_xstate_to_user() APIs x86/fpu: Clean up parameter order in the copy_xstate_to_*() APIs x86/fpu: Clean up the parameter definitions of copy_xstate_to_*() x86/fpu: Remove the 'start_pos' parameter from the __copy_xstate_to_*() functions x86/fpu: Clarify parameter names in the copy_xstate_to_*() methods x86/fpu: Change 'size_total' parameter to unsigned and standardize the size checks in copy_xstate_to_*() x86/fpu: Simplify __copy_xstate_to_kernel() return values x86/fpu: Split copy_user_to_xstate() into copy_kernel_to_xstate() & copy_user_to_xstate() x86/fpu: Remove 'ubuf' parameter from the copy_kernel_to_xstate() API x86/fpu: Remove 'kbuf' parameter from the copy_user_to_xstate() API x86/fpu: Flip the parameter order in copy_*_to_xstate() arch/x86/include/asm/fpu/xstate.h | 8 +-- arch/x86/kernel/fpu/regset.c | 15 +++-- arch/x86/kernel/fpu/signal.c | 11 ++-- arch/x86/kernel/fpu/xstate.c | 188 ++++++++++++++++++++++++++++++++++++++++++++++------------ 4 files changed, 168 insertions(+), 54 deletions(-) -- 2.7.4
