[Bug libdw/26177] eu-unstrip -n -k fails on kernels 4.14-4.19

mark at klomp dot org sourceware-bugzilla@sourceware.org
Sun Jun 28 13:35:57 GMT 2020


https://sourceware.org/bugzilla/show_bug.cgi?id=26177

Mark Wielaard <mark at klomp dot org> changed:

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

--- Comment #3 from Mark Wielaard <mark at klomp dot org> ---
Thanks for the report, analysis and testing.

commit eff30a6dabe52ac77ee5c6a0d31853fc8e3aeadb
Author: Mark Wielaard <mark@klomp.org>
Date:   Sun Jun 28 15:27:25 2020 +0200

    libdwfl: read_address should use increasing address in intuit_kernel_bounds

    In kernels from 4.14 up to 4.19 in /proc/kallsyms there are special
    __entry_SYSCALL_64_trampoline symbols. The problem is that they come
    after the last kernel address, but before the module addresses.
    And they are (much) smaller than the start address we found. This
    confuses intuit_kernel_bounds and makes it fail.

    Make sure to check read_address returns an increasing address when
    searching for the end.

    https://sourceware.org/bugzilla/show_bug.cgi?id=26177

    Reported-by: Vitaly Chikunov <vt@altlinux.org>
    Signed-off-by: Mark Wielaard <mark@klomp.org>

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