From: Rong Tao <rongtao@xxxxxxxx>
When the target file is used as input and output at the same time, the
input file will read a null value, resulting in a segmentation fault.
Add judgment conditions in bpftool and libbpf to prevent segmentation
error.
ChangeLog v2 -> v3:
- argc_cpy and argv_cpy need to be initialised _after_ the call to
GET_ARG()
ChangeLog v1 -> v2:
- Compare each output file.
v4: This patchset, double check and fix in libbpf.
v3: https://lore.kernel.org/lkml/tencent_A7A870BF168D6A21BA193408D5645D5D920A@xxxxxx/
v2: https://lore.kernel.org/lkml/tencent_F62A51AFF6A38188D70664421F5934974008@xxxxxx/
v1: https://lore.kernel.org/lkml/tencent_410B8166C55CD2AB64BDEA8E92204619180A@xxxxxx/
Rong Tao (2):
bpftool: Fix gen object segfault
libbpf: linker: Avoid using object file as both input and output
tools/bpf/bpftool/gen.c | 13 +++++++++++++
tools/lib/bpf/linker.c | 5 +++++
2 files changed, 18 insertions(+)
--
2.47.1
