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5f185caa73
On Skylake processors and kernel older than v4.14
ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, iov)
may return not full xstate, ommiting FP part (that is XFEATURE_MASK_FP).
There is a patch which describes this bug:
https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1318800.html
Anyway, it's fixed in v4.14 kernel by (what we believe with Andrey) this:
https://patchwork.kernel.org/patch/9567939/
As we still support kernels from v3.10 and newer, we need to have a
workaround for this kernel bug on Skylake CPUs.
Big thanks to Shlomi for the reports, the effort and for providing an
Amazon VM to test this. I wish more bug reporters were like you.
Reported-by: Shlomi Matichin <shlomi@binaris.com>
Provided-test-env: Shlomi Matichin <shlomi@binaris.com>
Investigated-with: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
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|---|---|---|
| .. | ||
| asm | ||
| common | ||
| compel | ||
| compel.h | ||
| cpu.h | ||
| handle-elf.h | ||
| infect-rpc.h | ||
| infect-util.h | ||
| infect.h | ||
| ksigset.h | ||
| log.h | ||
| loglevels.h | ||
| plugins | ||
| plugins.h | ||
| ptrace.h | ||
| sigframe-common.h | ||
| task-state.h | ||