"Michael Kerrisk (man-pages)" <mtk.manpages@xxxxxxxxx> writes: > From: Michael Kerrisk <mtk.manpages@xxxxxxxxx> > > commit fe8c7f5cbf91124987106faa3bdf0c8b955c4cf7 added two new prctl() > operations, PR_MPX_ENABLE_MANAGEMENT and PR_MPX_DISABLE_MANAGEMENT. > However, no checks were included to ensure that unused arguments > are zero, as is done in many existing prctl()s and as should be > done for all new prctl()s. This patch adds the required checks. This will break the existing gcc run time, which doesn't zero these arguments. -ANdi > > Signed-off-by: Michael Kerrisk <mtk.manpages@xxxxxxxxx> > --- > kernel/sys.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/kernel/sys.c b/kernel/sys.c > index a8c9f5a..ea9c881 100644 > --- a/kernel/sys.c > +++ b/kernel/sys.c > @@ -2210,9 +2210,13 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, > up_write(&me->mm->mmap_sem); > break; > case PR_MPX_ENABLE_MANAGEMENT: > + if (arg2 || arg3 || arg4 || arg5) > + return -EINVAL; > error = MPX_ENABLE_MANAGEMENT(me); > break; > case PR_MPX_DISABLE_MANAGEMENT: > + if (arg2 || arg3 || arg4 || arg5) > + return -EINVAL; > error = MPX_DISABLE_MANAGEMENT(me); > break; > default: > -- > 1.9.3 -- ak@xxxxxxxxxxxxxxx -- Speaking for myself only -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>