On 05/03/21 5:24 pm, Ravi Bangoria wrote: > As per ISA 3.1, prefixed instruction should not cross 64-byte > boundary. So don't allow Uprobe on such prefixed instruction. > > There are two ways probed instruction is changed in mapped pages. > First, when Uprobe is activated, it searches for all the relevant > pages and replace instruction in them. In this case, if that probe > is on the 64-byte unaligned prefixed instruction, error out > directly. Second, when Uprobe is already active and user maps a > relevant page via mmap(), instruction is replaced via mmap() code > path. But because Uprobe is invalid, entire mmap() operation can > not be stopped. In this case just print an error and continue. > > Signed-off-by: Ravi Bangoria <ravi.bango...@linux.ibm.com> > Acked-by: Naveen N. Rao <naveen.n....@linux.vnet.ibm.com> > --- > v3: > https://lore.kernel.org/r/20210304050529.59391-1-ravi.bango...@linux.ibm.com > v3->v4: > - CONFIG_PPC64 check was not required, remove it. > - Use SZ_ macros instead of hardcoded numbers. >
Acked-by: Sandipan Das <sandi...@linux.ibm.com>
