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(parent: a61f810) | patch
ftrace: Fix function_graph tracer interaction with BPF trampoline
authorAlexei Starovoitov <ast@kernel.org>
Mon, 9 Dec 2019 00:01:12 +0000 (16:01 -0800)
committerSteven Rostedt (VMware) <rostedt@goodmis.org>
Tue, 10 Dec 2019 18:53:59 +0000 (13:53 -0500)
commitff205766dbbee024a4a716638868d98ffb17748a
tree503d0cfaaecf515dd179e6e0c6a8c0ef57f2b3cbtree
parenta61f810567be0ef101d8bbb65b89ffeac7d62103commit | diff
ftrace: Fix function_graph tracer interaction with BPF trampoline

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>
arch/x86/kernel/ftrace.c diff | blob | history
include/linux/ftrace.h diff | blob | history
kernel/trace/fgraph.c diff | blob | history
kernel/trace/ftrace.c diff | blob | history
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