device: 0.155
other: 0.148
semantic: 0.135
vnc: 0.087
socket: 0.064
network: 0.063
debug: 0.061
graphic: 0.051
performance: 0.048
permissions: 0.046
files: 0.040
PID: 0.040
boot: 0.038
KVM: 0.024
debug: 0.546
other: 0.091
files: 0.075
PID: 0.055
semantic: 0.038
KVM: 0.036
network: 0.030
performance: 0.030
device: 0.022
socket: 0.018
permissions: 0.018
graphic: 0.016
boot: 0.014
vnc: 0.012

x86_cpu_gdb_read_register segfaults when gdb requests registers

When attempting to attach to the gdbstub, a segfault occurs.

I traced this down to a problem in a call to gdb_get_reg16 where the mem_buf
was being treated like a uint8_t* instead of a GByteArray.  The buffer passed
to gdb_get_reg16 ends up passing an invalid GByteArray pointer, which subsequently
causes a segfault in memcpy.

I have a fix for this - just need to educate myself on how to submit a patch.

Thanks for tracking down the source of the bug. Our 'submitting patches' policy is at https://wiki.qemu.org/Contribute/SubmitAPatch in case you haven't already found it. (It's quite long but for a simple one-shot bugfix patch the important stuff is just the summarized bits at the top.)


Fixed in commit bbc40fefcee0d69d61ceaf8c0695d2ce43cdc87b.