• Jeff Dike's avatar
    [PATCH] uml: use correct register file size everywhere · b92c4f92
    Jeff Dike authored
    This patch uses MAX_REG_NR consistently to refer to the register file size.
     FRAME_SIZE isn't sufficient because on x86_64, it is smaller than the
    ptrace register file size.  MAX_REG_NR was introduced as a consistent way
    to get the number of registers, but wasn't used everywhere it should be.
    
    When this causes a problem, it makes PTRACE_SETREGS fail on x86_64 because
    of a corrupted segment register value in the known-good register file.  The
    patch also adds a register dump at that point in case there are any future
    problems here.
    Signed-off-by: default avatarJeff Dike <jdike@linux.intel.com>
    Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
    Cc: <stable@kernel.org>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    b92c4f92
mem.c 6.62 KB