ftrace: Fix function_graph tracer interaction with BPF trampoline

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Depending on type of BPF programs served by BPF trampoline it can call original
function. In such case the trampoline will skip one stack frame while
returning. That will confuse function_graph tracer and will cause crashes with
bad RIP. Teach graph tracer to skip functions that have BPF trampoline attached.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

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Alexei Starovoitov 2019-12-08 16:01:12 -08:00 • committed by Steven Rostedt (VMware)

parent a61f810567

commit ff205766db

4 changed files with 21 additions and 26 deletions

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14

arch/x86/kernel/ftrace.c

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5

include/linux/ftrace.h

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9

kernel/trace/fgraph.c

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19

kernel/trace/ftrace.c

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