Re comments #8 and #10, I don't replicate that. I get full pass on KASAN_UNIT_TEST with and without virtualization enabled.
Re comment #9, if there are bugs suspected in qemu, they need to be reported, or we'll never hear about them. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1921948 Title: MTE tags not checked properly for unaligned accesses at EL1 Status in QEMU: In Progress Bug description: For kernel memory accesses that span across two memory granules, QEMU's MTE implementation only checks the tag of the first granule but not of the second one. To reproduce this, build the Linux kernel with CONFIG_KASAN_HW_TAGS enabled, apply the patch below, and boot the kernel: diff --git a/sound/last.c b/sound/last.c index f0bb98780e70..04745cb30b74 100644 --- a/sound/last.c +++ b/sound/last.c @@ -5,12 +5,18 @@ */ #include <linux/init.h> +#include <linux/slab.h> #include <sound/core.h> static int __init alsa_sound_last_init(void) { struct snd_card *card; int idx, ok = 0; + + char *ptr = kmalloc(128, GFP_KERNEL); + pr_err("KASAN report should follow:\n"); + *(volatile unsigned long *)(ptr + 124); + kfree(ptr); printk(KERN_INFO "ALSA device list:\n"); for (idx = 0; idx < SNDRV_CARDS; idx++) { KASAN tags the 128 allocated bytes with the same tag as the returned pointer. The memory granule that follows the 128 allocated bytes has a different tag (with 1/15 probability). Expected result: a tag fault is detected and a KASAN report is printed when accessing bytes [124, 130). Observed result: no tag fault is detected and no KASAN report is printed. Here are the flags that I use to run QEMU if they matter: qemu-system-aarch64 -s -machine virt,mte=on -cpu max -m 2G -smp 2 -net user,host=10.0.2.10,hostfwd=tcp:127.0.0.1:10021-:22 -net nic -nographic -kernel ./Image -append "console=ttyAMA0 root=/dev/vda earlyprintk=serial" -drive file=./fs.img,format=raw,if=virtio -no- shutdown -no-reboot To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1921948/+subscriptions
