On Sat, 2025-12-20 at 19:18 +0100, Maurice Hieronymus wrote: > modbuildid is never set when kallsyms_lookup_buildid is returning via > successful bpf_address_lookup or ftrace_mod_address_lookup. > > This leads to an uninitialized pointer dereference on x86 when > CONFIG_STACKTRACE_BUILD_ID=y inside __sprint_symbol. > > Prevent this by always initializing modbuildid. > > Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220717 > > Changes to v3: > - Split the changes into separate ftrace and bpf patches > - Replace IS_ENABLED() with plain #ifdef > > Maurice Hieronymus (2): > kallsyms: Always initialize modbuildid on ftrace address > kallsyms: Always initialize modbuildid on bpf address > > include/linux/filter.h | 6 ++++-- > include/linux/ftrace.h | 4 ++-- > kernel/kallsyms.c | 4 ++-- > kernel/trace/ftrace.c | 8 +++++++- > 4 files changed, 15 insertions(+), 7 deletions(-) > > > base-commit: dd9b004b7ff3289fb7bae35130c0a5c0537266af
This patch is obsolete and already fixed by [1] [1] https://lore.kernel.org/bpf/[email protected]/#t
