On Okt 05 2020, Palmer Dabbelt wrote: > On Mon, 05 Oct 2020 01:25:22 PDT (-0700), schwab@xxxxxxxxxxxxxx wrote: >> On Sep 14 2020, Aurelien Jarno wrote: >> >>> How should we proceed to get that fixed in time for 5.9? For the older >>> branches where it has been backported (so far 5.7 and 5.8), should we >>> just get that commit reverted instead? >> >> Why is this still broken? > > Sorry, I hadn't seen this. I'm not seeing a boot failure on 5.9-rc8 with just > CONFIG_HARDENED_USERCPOY=y in addition to defconfig (on QEMU, though I doubt > that's relevant here). I don't see a boot failure either, but eventually you will get crashes like this, and resources are not properly released: [ 4560.936645] usercopy: Kernel memory overwrite attempt detected to kernel text (offset 241626, size 16)! [ 4560.945324] ------------[ cut here ]------------ [ 4560.949954] kernel BUG at mm/usercopy.c:99! [ 4560.954030] Kernel BUG [#1] [ 4560.956805] Modules linked in: nfsv3 nfs_acl rfkill mmc_block sf_pdma i2c_ocores virt_dma spi_sifive uio_pdrv_genirq uio loop drm drm_panel_orientation_quirks rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache af_packet mscc macsec macb ptp pps_core phylink of_mdio fixed_phy libphy pwm_sifive mmc_spi crc_itu_t crc7 of_mmc_spi mmc_core spi_bitbang sunrpc sg dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc scsi_dh_alua [ 4560.995103] CPU: 2 PID: 23806 Comm: nis Not tainted 5.8.10-1-default #1 openSUSE Tumbleweed (unreleased) [ 4561.004563] epc: ffffffe00036140e ra : ffffffe00036140e sp : ffffffe004bc7d60 [ 4561.011679] gp : ffffffe00127ee60 tp : ffffffe1b05d0000 t0 : ffffffe001297ca0 [ 4561.018886] t1 : ffffffe001297c30 t2 : 0000000000000000 s0 : ffffffe004bc7d80 [ 4561.026093] s1 : ffffffe00003afda a0 : 000000000000005b a1 : ffffffe1f7d67588 [ 4561.033298] a2 : ffffffe1f7d6c108 a3 : 0000000000000000 a4 : ffffffe000043e80 [ 4561.040506] a5 : ffffffe1f7d6be80 a6 : 0000000000000144 a7 : 0000000000000000 [ 4561.047712] s2 : 0000000000000010 s3 : 0000000000000000 s4 : ffffffe00003afea [ 4561.054918] s5 : ffffffe1f7e00e80 s6 : 0000002af4a2c2e0 s7 : fffffffffffff000 [ 4561.062124] s8 : 0000003ffffff000 s9 : ffffffe19f985400 s10: 0000000000000010 [ 4561.069329] s11: ffffffe1f7e00e80 t3 : 0000000000038fa8 t4 : 0000000000038fa8 [ 4561.076533] t5 : 0000000000000001 t6 : ffffffe00128e062 [ 4561.081832] status: 0000000200000120 badaddr: 0000000000000000 cause: 0000000000000003 [ 4561.089821] ---[ end trace a7c93e7595e9c2cc ]--- [ 4561.095589] BUG: Bad rss-counter state mm:00000000c54f4c29 type:MM_ANONPAGES val:1 Andreas. -- Andreas Schwab, schwab@xxxxxxxxxxxxxx GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."
