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authorChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:07 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:17 +0200
commit9260319e7411ff8281700a532caa436f40120ec4 (patch)
tree2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues/target_missing/host_missing/accel_missing/2149.toml
parent225caa38269323af1bfc2daadff5ec8bd930747f (diff)
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-id = 2149
-title = "Segfault in libvhost-user and libvduse because of invalid pointer arithmetic with indirect read"
-state = "opened"
-created_at = "2024-02-04T09:27:47.046Z"
-closed_at = "n/a"
-labels = []
-url = "https://gitlab.com/qemu-project/qemu/-/issues/2149"
-host-os = "Any OS supporting libvhost-user/libvduse"
-host-arch = "n/a"
-qemu-version = "n/a"
-guest-os = "n/a"
-guest-arch = "n/a"
-description = """Hello, this is my first experience communicating with open-source community. I have already reported the problem and have submitted patches through qemu-devel mailing list https://mail.gnu.org/archive/html/qemu-devel/2024-01/msg02533.html, as instructed in https://www.qemu.org/docs/master/devel/submitting-a-patch.html, albeit getting no response from any maintainer. I know, that everyone are very busy and are spammed everyday from millions of threads, but I am getting very upset, that such a trivial bug lives in code base for many years and even have been copied to "sister"-library without proper review. So, excuse me, if I am taking this issue too personally.
-
-The problem - when one tries to use libvhost-user\\libvduse and triggers for some reason non-zero-copy mode (like pushing a lot of data) of indirect descriptor reading routine `virtqueue_read_indirect_desc`, any time one got to read more than one descriptor - one would overwrite stack and depending on one's luck getting some weird behaviour, or simple crash moments later, when other code tries to access broken data.
-
-Steps to reproduce are non-trivial, because depends on one's host and VM (one simply gets random crashes here and there, with core dumps pointing somewhere around given libraries), but anyone who can read C code, can clearly see that pointer arithmetic of `struct vring_desc *desc` is wrong.
-
-Maybe, I got instructions wrong and posted fixes to wrong mailing list, maybe, nobody cares, so thank you for attention. I'll be glad to hear any advice on how can I help with fixing this simple error, besides what has been done already.
-
-Thank you."""
-reproduce = "n/a"
-additional = "n/a"