https://github.com/torvalds/linux
Revision a9789ef9afcb4fb0193f8dd94f2665ba3ad71e79 authored by Daniel Borkmann on 24 May 2017, 23:05:06 UTC, committed by David S. Miller on 25 May 2017, 17:44:27 UTC
Currently, after performing helper calls, we clear all caller saved registers, that is r0 - r5 and fill r0 depending on struct bpf_func_proto specification. The way we reset these regs can affect pruning decisions in later paths, since we only reset register's imm to 0 and type to NOT_INIT. However, we leave out clearing of other variables such as id, min_value, max_value, etc, which can later on lead to pruning mismatches due to stale data. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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Tip revision: a9789ef9afcb4fb0193f8dd94f2665ba3ad71e79 authored by Daniel Borkmann on 24 May 2017, 23:05:06 UTC
bpf: properly reset caller saved regs after helper call and ld_abs/ind
bpf: properly reset caller saved regs after helper call and ld_abs/ind
Tip revision: a9789ef
| File | Mode | Size |
|---|---|---|
| Documentation | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 31 bytes |
| .gitattributes | -rw-r--r-- | 30 bytes |
| .gitignore | -rw-r--r-- | 1.3 KB |
| .mailmap | -rw-r--r-- | 8.1 KB |
| COPYING | -rw-r--r-- | 18.3 KB |
| CREDITS | -rw-r--r-- | 96.2 KB |
| Kbuild | -rw-r--r-- | 2.2 KB |
| Kconfig | -rw-r--r-- | 252 bytes |
| MAINTAINERS | -rw-r--r-- | 397.7 KB |
| Makefile | -rw-r--r-- | 58.6 KB |
| README | -rw-r--r-- | 722 bytes |
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