Date: Wed, 8 Nov 2023 10:04:51 -0800 From: Alexei Starovoitov <alexei.starovoitov@...il.com> To: Solar Designer <solar@...nwall.com>, Daniel Borkmann <daniel@...earbox.net> Cc: oss-security@...ts.openwall.com, Hsin-Wei Hung <hsinweih@....edu>, Alexei Starovoitov <ast@...nel.org> Subject: Re: Linux: BPF: issues with copy_from_user_nofault() On Sun, Nov 5, 2023 at 2:43 PM Solar Designer <solar@...nwall.com> wrote: > > Hi, > > Looks like the below wasn't brought to oss-security yet. > > As I understand from what was posted to the linux-distros thread, the > issue was being fixed in: > > https://email@example.com/ > > and actually fixed in: > > https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=d319f344561d > > and it should have been merged to stable "tomorrow or so" after June 27, > at which point Hsin-Wei Hung was supposed to finally make the > oss-security posting, but apparently that never happened. > > Of course, the delay from January 2 to June 28 was way in excess of the > supposed maximum, and it is even more ridiculous we didn't post in here > for even longer. > > This is what happens when no one in particular keeps tracking issues > after they fall out of the attention span. This is also why we need to > take care of the distros list statistics task in real time, not only > retroactively like I'm doing for 2023 now. As I tried to explain, the fix addresses two things: - the WARN. By itself it's harmless and the severity is low. - lockup with CONFIG_HARDENED_USERCOPY from bpf. That is a real bug and backports are necessary. But the 2nd part of the fix: https://firstname.lastname@example.org/ was never merged. Essentially perf (without any bpf) is broken on arm64 and others. arch_perf_out_copy_user() might deadlock with CONFIG_HARDENED_USERCOPY.
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