Messages in this thread | | | From | Andy Lutomirski <> | Date | Mon, 11 Jan 2021 15:40:19 -0800 | Subject | Re: gdbserver + fsgsbase kaputt |
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On Mon, Jan 11, 2021 at 1:06 PM Andy Lutomirski <luto@amacapital.net> wrote: > > > > On Jan 11, 2021, at 12:00 PM, Borislav Petkov <bp@alien8.de> wrote: > > > > > > Or do you mean I should add "unsafe_fsgsbase" to grub cmdline and bisect > > with fsgsbase enabled in all test kernels? > > Yes. But I can also look myself in a bit. >
Tom, if I reproduce it in an interactive gdb and play a bit, I get:
Program received signal SIGSEGV, Segmentation fault. 0xf7df2cb6 in init_cacheinfo () from target:/lib/libc.so.6 (gdb) p $gs = $gs $1 = 99 (gdb) si
Program terminated with signal SIGSEGV, Segmentation fault. The program no longer exists.
That's gdb itself crashing. Any idea what's wrong?
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