mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2025-02-24 17:33:03 +07:00
2958b66694
coprocessor_flush_all may be called from a context of a thread that is different from the thread being flushed. In that case contents of the cpenable special register may not match ti->cpenable of the target thread, resulting in unhandled coprocessor exception in the kernel context. Set cpenable special register to the ti->cpenable of the target register for the duration of the flush and restore it afterwards. This fixes the following crash caused by coprocessor register inspection in native gdb: (gdb) p/x $w0 Illegal instruction in kernel: sig: 9 [#1] PREEMPT Call Trace: ___might_sleep+0x184/0x1a4 __might_sleep+0x41/0xac exit_signals+0x14/0x218 do_exit+0xc9/0x8b8 die+0x99/0xa0 do_illegal_instruction+0x18/0x6c common_exception+0x77/0x77 coprocessor_flush+0x16/0x3c arch_ptrace+0x46c/0x674 sys_ptrace+0x2ce/0x3b4 system_call+0x54/0x80 common_exception+0x77/0x77 note: gdb[100] exited with preempt_count 1 Killed Cc: stable@vger.kernel.org Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> |
||
|---|---|---|
| .. | ||
| .gitignore | ||
| align.S | ||
| asm-offsets.c | ||
| coprocessor.S | ||
| entry.S | ||
| head.S | ||
| hw_breakpoint.c | ||
| irq.c | ||
| Makefile | ||
| mcount.S | ||
| module.c | ||
| mxhead.S | ||
| pci-dma.c | ||
| pci.c | ||
| perf_event.c | ||
| platform.c | ||
| process.c | ||
| ptrace.c | ||
| s32c1i_selftest.c | ||
| setup.c | ||
| signal.c | ||
| smp.c | ||
| stacktrace.c | ||
| syscall.c | ||
| time.c | ||
| traps.c | ||
| vectors.S | ||
| vmlinux.lds.S | ||
| xtensa_ksyms.c | ||