[Bug runtime/31074] On aarch64 the systemtap.base/set_kernel.stp triggers "Unable to handle kernel paging request"

["wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31074

William Cohen <wcohen at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|ASSIGNED                    |RESOLVED

--- Comment #8 from William Cohen <wcohen at redhat dot com> ---
Fixed by

commit b84a5e8c2c5a857c0790a71df7824259a95131cf (HEAD -> master, origin/master,
origin/HEAD)
Author: William Cohen <wcohen@redhat.com>
Date:   Mon Dec 4 11:28:10 2023 -0500

    PR31074: Ensure that the set_kernel_string* functions limit their writes

    Both the set_kernel_string and set_kernel_string_n function use the
    underlying _stp_store_deref_string_ function to write strings.  There
    were two issues with the this function:

     1) wrote MAXSTRINGLEN bytes even if string was shorter
     2) null write at end could spill past end of buffer

    The first issue was addressed by stopping to write once a null
    character is encountered.  The second issue is a side effect of C
    implicit promotion of character constants to ints and was addressed by
    explicitlying casting the character constants as a char.

    The pr31074.exp test was added to verify that the write length are
    limited to string length and the null write does not go beyond the end
    of the buffer.

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