On Wed, Nov 1, 2017 at 10:26 PM, Willy Tarreau <w@xxxxxx> wrote: > From: Helge Deller <deller@xxxxxx> > > commit 37511fb5c91db93d8bd6e3f52f86e5a7ff7cfcdf upstream. > > Jörn Engel noticed that the expand_upwards() function might not return Jörn (yeah, the original commit suffers from this, too ;-) > -ENOMEM in case the requested address is (unsigned long)-PAGE_SIZE and > if the architecture didn't defined TASK_SIZE as multiple of PAGE_SIZE. > > Affected architectures are arm, frv, m68k, blackfin, h8300 and xtensa > which all define TASK_SIZE as 0xffffffff, but since none of those have > an upwards-growing stack we currently have no actual issue. > > Nevertheless let's fix this just in case any of the architectures with > an upward-growing stack (currently parisc, metag and partly ia64) define > TASK_SIZE similar. > > Link: http://lkml.kernel.org/r/20170702192452.GA11868@xxxxxxxx > Fixes: bd726c90b6b8 ("Allow stack to grow up to address space limit") > Signed-off-by: Helge Deller <deller@xxxxxx> > Reported-by: Jörn Engel <joern@xxxxxxxxxxxxxxx> > Cc: Hugh Dickins <hughd@xxxxxxxxxx> > Cc: Oleg Nesterov <oleg@xxxxxxxxxx> > Cc: <stable@xxxxxxxxxxxxxxx> > Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > Signed-off-by: Willy Tarreau <w@xxxxxx> Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds