On 01/07/2015 12:53 PM, Michael Kerrisk (man-pages) wrote:
...
Still hoping to hear from Will Drewy regarding this FIXME in the
page source:
.\" FIXME What is the significance of the line
.\" ftest->code = BPF_LDX | BPF_W | BPF_ABS;
.\" in kernel/seccomp.c::seccomp_check_filter()?
This came in from our rework via commit bd4cf0ed331a ("net: filter:
rework/optimize internal BPF interpreter's instruction set"), and
is kernel-internal only, and unused in classic BPF. It translates
into A = *(u32 *) (ctx + K) and will basically load an offset from
the populated seccomp_data (= ctx) to A. For the man-page itself
it has therefore no relevance, hope that clarifies it.
Cheers,
Daniel
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