Hi Sergei! On 4/3/21 9:48 AM, Sergei Trofimovich wrote: > Noticed failure as a crash on ia64 when tried to symbolize all > backtraces collected by page_owner=on: > > $ cat /sys/kernel/debug/page_owner > <oops> > > CPU: 1 PID: 2074 Comm: cat Not tainted 5.12.0-rc4 #226 > Hardware name: hp server rx3600, BIOS 04.03 04/08/2008 > ip is at dereference_module_function_descriptor+0x41/0x100 > > Crash happens at dereference_module_function_descriptor() due to > use-after-free when dereferencing ".opd" section header. > > All section headers are already freed after module is laoded > successfully. > > To keep symbolizer working the change stores ".opd" address > and size after module is relocated to a new place and before > section headers are discarded. > > To make similar errors less obscure module_finalize() now > zeroes out all variables relevant to module loading only. Typo: s/zeroes/zero/. Adrian -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer - glaubitz@xxxxxxxxxx `. `' Freie Universitaet Berlin - glaubitz@xxxxxxxxxxxxxxxxxxx `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
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