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| author | Andrei Vagin <avagin@google.com> | 2021-01-19 15:31:49 -0800 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2021-01-19 15:34:02 -0800 |
| commit | 48ea2c34d1d3dead7727d9e2760b587c7609b14b (patch) | |
| tree | 7b8e2c8bc3a2a1a8da7f780800e4d2aae674b943 /test/util/save_util_other.cc | |
| parent | be17b94446b2f96c2a3d531fe20271537c77c8aa (diff) | |
platform/ptrace: workaround a kernel ptrace issue on ARM64
On ARM64, when ptrace stops on a system call, it uses the x7 register to
indicate whether the stop has been signalled from syscall entry or syscall
exit. This means that we can't get a value of this register and we can't change
it. More details are in the comment for tracehook_report_syscall in
arch/arm64/kernel/ptrace.c.
This happens only if we stop on a system call, so let's queue a signal, resume
a stub thread and catch it on a signal handling.
Fixes: #5238
PiperOrigin-RevId: 352668695
Diffstat (limited to 'test/util/save_util_other.cc')
0 files changed, 0 insertions, 0 deletions