On Tue, Oct 11, 2022 at 05:52:13PM +0100, Dimitri John Ledkov wrote: > #regzbot ^introduced 2139619bcad7ac44cc8f6f749089120594056613 > > Over at https://lore.kernel.org/linux-riscv/Yz80ewHKTPI5Rvuz@spud/T/#ebde47064434d4ca4807b4abb8eb39898c48a8de2 > it is reported that 2139619bcad7ac44cc8f6f749089120594056613 > regresses userspace (openjdk) on riscv64. > > This commit has already been released in v6.0 kernel upstream, > but has also been included in the stable patch series all the > way back to v4.19.y > > There is a proposed fix for this at > https://lore.kernel.org/linux-riscv/20220915193702.2201018-1-abrestic@xxxxxxxxxxxx/ > which has not yet been merged upstream or in stable series. > > Please review and merge above proposed fix, or please revert > 2139619bcad7ac44cc8f6f749089120594056613 to stop the regression > spreading to all the distributions. Out of curiosity, and given the CC list lacks a CC of the maintainer, who are you actually asking to review and/or merge this? I'll go bump the fix itself. Thanks, Conor. > > In Ubuntu this regression will be tracked as https://bugs.launchpad.net/bugs/+bug/1992484 > > -------- Forwarded Message -------- > Subject: Re: [PATCH] riscv: mmap with PROT_WRITE but no PROT_READ is invalid > Date: Thu, 6 Oct 2022 22:20:02 +0300 > From: Eva Kotova <nyandarknessgirl@xxxxxxxxx> > Reply-To: PH7PR14MB559464DBDD310E755F5B21E8CEDC9@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx > To: coelacanthus@xxxxxxxxxxx > CC: c141028@xxxxxxxxx, dramforever@xxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx, palmer@xxxxxxxxxxx, xc-tan@xxxxxxxxxxx > > On Tue, 31 May 2022 00:56:52 PDT (-0700), coelacanthus@xxxxxxxxxxx wrote: > > As mentioned in Table 4.5 in RISC-V spec Volume 2 Section 4.3, write > > but not read is "Reserved for future use.". For now, they are not valid. > > In the current code, -wx is marked as invalid, but -w- is not marked > > as invalid. > > This patch breaks OpenJDK/Java on RISC-V, as it tries to create a w-only > protective page: > > # > # There is insufficient memory for the Java Runtime Environment to continue. > # Native memory allocation (mmap) failed to map 4096 bytes for failed to > allocate memory for PaX check. > # An error report file with more information is saved as: > # /root/hs_err_pid107.log > > I bisected to this commit since on Linux 5.19+ java no longer works. > Perhaps some fallback should be implemented, to prevent userspace > breakage. It is currently documented, that at least on i386 PROT_WRITE > mappings imply PROT_READ (See man mmap(2) NOTES), this would be a good > place to start. > > Best regards, > Eva > > _______________________________________________ > linux-riscv mailing list > linux-riscv@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-riscv >
