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[bpf,v2,0/3] Restrict bpf_probe_read{,str}() and bpf_trace_printk()'s %s

Message ID 20200515101118.6508-1-daniel@iogearbox.net
Headers show
Series Restrict bpf_probe_read{,str}() and bpf_trace_printk()'s %s | expand

Message

Daniel Borkmann May 15, 2020, 10:11 a.m. UTC 
Small set of fixes in order to restrict BPF helpers for tracing which are
broken on archs with overlapping address ranges as per discussion in [0].
I've targetted this for -bpf tree so they can be routed as fixes. Thanks!

v1 -> v2:
  - switch to reusable %pks, %pus format specifiers (Yonghong)
  - fixate %s on kernel_ds probing for archs with overlapping addr space

  [0] https://lore.kernel.org/bpf/CAHk-=wjJKo0GVixYLmqPn-Q22WFu0xHaBSjKEo7e7Yw72y5SPQ@mail.gmail.com/T/

Daniel Borkmann (3):
  bpf: restrict bpf_probe_read{,str}() only to archs where they work
  bpf: add bpf_probe_read_{user, kernel}_str() to do_refine_retval_range
  bpf: restrict bpf_trace_printk()'s %s usage and add %pks, %pus specifier

 Documentation/core-api/printk-formats.rst |  14 +++
 arch/arm/Kconfig                          |   1 +
 arch/arm64/Kconfig                        |   1 +
 arch/x86/Kconfig                          |   1 +
 init/Kconfig                              |   3 +
 kernel/bpf/verifier.c                     |   4 +-
 kernel/trace/bpf_trace.c                  | 100 ++++++++++++++--------
 lib/vsprintf.c                            |  12 +++
 8 files changed, 101 insertions(+), 35 deletions(-)