On Wed, 2018-10-31 at 14:38:20 UTC, Breno Leitao wrote: > Some ptrace selftests are passing input operands using a constraint that > can allocate any register for the operand, and using these registers on > load/store operations. > > If the register allocated by the compiler happens to be zero (r0), it might > cause an invalid memory address access, since load and store operations > consider the content of 0x0 address if the base register is r0, instead of > the content of the r0 register. For example: > > r1 := 0xdeadbeef > r0 := 0xdeadbeef > > ld r2, 0(1) /* will load into r2 the content of r1 address */ > ld r2, 0(0) /* will load into r2 the content of 0x0 */ > > In order to avoid this possible problem, the inline assembly constraint > should be aware that these registers will be used as a base register, thus, > r0 should not be allocated. > > Other than that, this patch removes inline assembly operands that are not > used by the tests. > > Signed-off-by: Breno Leitao <lei...@debian.org> > Reviewed-by: Segher Boessenkool <seg...@kernel.crashing.org>
Series applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/5249497a7bb6334fcc128588d6a7e1 cheers
