Daniel Borkmann 3612af783c bpf: fix sanitation rewrite in case of non-pointers ... Marek reported that he saw an issue with the below snippet in that timing measurements where off when loaded as unpriv while results were reasonable when loaded as privileged: [...] uint64_t a = bpf_ktime_get_ns(); uint64_t b = bpf_ktime_get_ns(); uint64_t delta = b - a; if ((int64_t)delta > 0) { [...] Turns out there is a bug where a corner case is missing in the fix d3bd7413e0 ("bpf: fix sanitation of alu op with pointer / scalar type from different paths"), namely fixup_bpf_calls() only checks whether aux has a non-zero alu_state, but it also needs to test for the case of BPF_ALU_NON_POINTER since in both occasions we need to skip the masking rewrite (as there is nothing to mask). Fixes: d3bd7413e0 ("bpf: fix sanitation of alu op with pointer / scalar type from different paths") Reported-by: Marek Majkowski <marek@cloudflare.com> Reported-by: Arthur Fabre <afabre@cloudflare.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/netdev/CAJPywTJqP34cK20iLM5YmUMz9KXQOdu1-+BZrGMAGgLuBWz7fg@mail.gmail.com/T/ Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2019-03-01 21:24:08 -08:00
..
bpf	bpf: fix sanitation rewrite in case of non-pointers	2019-03-01 21:24:08 -08:00
cgroup
configs
debug
dma
events	perf/core: Fix impossible ring-buffer sizes warning	2019-02-13 08:05:02 +01:00
gcov
irq
livepatch
locking	futex: Handle early deadlock return correctly	2019-02-08 13:00:36 +01:00
power
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sched	psi: avoid divide-by-zero crash inside virtual machines	2019-02-21 09:01:00 -08:00
time
trace	Two more tracing fixes	2019-02-18 09:40:16 -08:00
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futex.c	futex: Handle early deadlock return correctly	2019-02-08 13:00:36 +01:00
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signal.c	signal: Restore the stop PTRACE_EVENT_EXIT	2019-02-13 08:31:41 -06:00
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