Josef Bacik f23cc643f9 bpf: fix range arithmetic for bpf map access ... I made some invalid assumptions with BPF_AND and BPF_MOD that could result in invalid accesses to bpf map entries. Fix this up by doing a few things 1) Kill BPF_MOD support. This doesn't actually get used by the compiler in real life and just adds extra complexity. 2) Fix the logic for BPF_AND, don't allow AND of negative numbers and set the minimum value to 0 for positive AND's. 3) Don't do operations on the ranges if they are set to the limits, as they are by definition undefined, and allowing arithmetic operations on those values could make them appear valid when they really aren't. This fixes the testcase provided by Jann as well as a few other theoretical problems. Reported-by: Jann Horn <jannh@google.com> Signed-off-by: Josef Bacik <jbacik@fb.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>		2016-11-16 13:21:45 -05:00
..
arraymap.c	bpf: Add bpf_current_task_under_cgroup helper	2016-08-12 21:49:41 -07:00
core.c	bpf: clean up put_cpu_var usage	2016-09-27 22:09:17 -04:00
hashtab.c	bpf: fix htab map destruction when extra reserve is in use	2016-11-07 13:20:52 -05:00
helpers.c	bpf: direct packet write and access for helpers for clsact progs	2016-09-20 23:32:11 -04:00
inode.c	fs: Replace CURRENT_TIME with current_time() for inode timestamps	2016-09-27 21:06:21 -04:00
Makefile	bpf: introduce percpu_freelist	2016-03-08 15:28:31 -05:00
percpu_freelist.c	bpf: introduce percpu_freelist	2016-03-08 15:28:31 -05:00
percpu_freelist.h	bpf: introduce percpu_freelist	2016-03-08 15:28:31 -05:00
stackmap.c	bpf: add BPF_CALL_x macros for declaring helpers	2016-09-09 19:36:04 -07:00
syscall.c	bpf: fix map not being uncharged during map creation failure	2016-11-07 13:22:26 -05:00
verifier.c	bpf: fix range arithmetic for bpf map access	2016-11-16 13:21:45 -05:00