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| author | Sean Christopherson <seanjc@google.com> | 2024-08-29 12:14:12 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2024-09-09 20:15:34 -0700 |
| commit | ec495f2ab12290b008a691e826b39b895f458945 (patch) | |
| tree | 5ffae0a5d55f26221708cb9bd57ab28b10447b30 | |
| parent | e027ba1b83ad017a56c108eea2f42eb9f8ae5204 (diff) | |
| download | linux-stable-ec495f2ab12290b008a691e826b39b895f458945.tar.gz linux-stable-ec495f2ab12290b008a691e826b39b895f458945.tar.bz2 linux-stable-ec495f2ab12290b008a691e826b39b895f458945.zip | |
KVM: Write the per-page "segment" when clearing (part of) a guest page
Pass "seg" instead of "len" when writing guest memory in kvm_clear_guest(),
as "seg" holds the number of bytes to write for the current page, while
"len" holds the total bytes remaining.
Luckily, all users of kvm_clear_guest() are guaranteed to not cross a page
boundary, and so the bug is unhittable in the current code base.
Fixes: 2f5414423ef5 ("KVM: remove kvm_clear_guest_page")
Reported-by: zyr_ms@outlook.com
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219104
Link: https://lore.kernel.org/r/20240829191413.900740-2-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
| -rw-r--r-- | virt/kvm/kvm_main.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index cb2b78e92910..04011b94edec 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -3581,7 +3581,7 @@ int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) int ret; while ((seg = next_segment(len, offset)) != 0) { - ret = kvm_write_guest_page(kvm, gfn, zero_page, offset, len); + ret = kvm_write_guest_page(kvm, gfn, zero_page, offset, seg); if (ret < 0) return ret; offset = 0; |