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SubjectRe: Crash in VirtualBox virtual machines running kernel 6.5
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On 7/19/23 10:36, Kees Cook wrote:
> Okay, please try:
>
> diff --git a/fs/vboxsf/shfl_hostintf.h b/fs/vboxsf/shfl_hostintf.h
> index aca829062c12..902fe3224453 100644
> --- a/fs/vboxsf/shfl_hostintf.h
> +++ b/fs/vboxsf/shfl_hostintf.h
> @@ -68,12 +68,11 @@ struct shfl_string {
>
> /** UTF-8 or UTF-16 string. Nul terminated. */
> union {
> - u8 utf8[2];
> - u16 utf16[1];
> - u16 ucs2[1]; /* misnomer, use utf16. */
> + DECLARE_FLEX_ARRAY(u8, utf8);
> + DECLARE_FLEX_ARRAY(u16, utf16);
> } string;
> };
> -VMMDEV_ASSERT_SIZE(shfl_string, 6);
> +VMMDEV_ASSERT_SIZE(shfl_string, 4);
>
> /* The size of shfl_string w/o the string part. */
> #define SHFLSTRING_HEADER_SIZE 4
>
>
> The size assert doesn't seem to be used anywhere else, but I can do a
> more careful binary analysis later today...''

Kees,

The testing was harder than I expected. My standard kernel would not load the
system disk on the VM, thus I had to build one using my distros configuration.
It is really painful to wait for all those drivers to build, but I figured that
might be faster than trying to find the incorrect parameter.

I can finally report that vboxsf no longer generated a BUG. It is getting
farther, but I am not done yet. It now generates a line that says "Unknown
parameter tag" and then hangs. I have not tracked that down yet.

I was not aware of the DECLARE_FLEX_ARRAY() macro. I had considered removing the
union and creating a simple string[] declaration, but I do not mess with file
systems, and decided to let the experts handle it.

I will let you know what I find about that unknown parameter. It probably is
coming from VirtualBox.

Thanks,

Larry

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