Re: System call number masking

2016-04-17 Thread Ben Hutchings
On Thu, 2016-04-14 at 10:48 -0700, Andy Lutomirski wrote: > On Thu, Apr 14, 2016 at 10:22 AM, Ben Hutchings wrote: > > > > I'm updating my x32-as-boot-time-option patch for 4.6, and I noticed a > > subtle change in system call number masking on x86_64 as a result of >

Re: System call number masking

2016-04-14 Thread Andy Lutomirski
On Thu, Apr 14, 2016 at 10:22 AM, Ben Hutchings wrote: > I'm updating my x32-as-boot-time-option patch for 4.6, and I noticed a > subtle change in system call number masking on x86_64 as a result of > moving the slow path into C. > > Previously we would mask out the upper

System call number masking

2016-04-14 Thread Ben Hutchings
I'm updating my x32-as-boot-time-option patch for 4.6, and I noticed a subtle change in system call number masking on x86_64 as a result of moving the slow path into C. Previously we would mask out the upper 32 bits before doing anything with the system call number, both on the slow and