linux-kernel - [PATCH v4 0/2] kallsyms: Always initialize modbuildid

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Message-ID: <20251220181838.63242-1-mhi@mailbox.org>
Date: Sat, 20 Dec 2025 19:18:36 +0100
From: Maurice Hieronymus <mhi@...lbox.org>
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Subject: [PATCH v4 0/2] kallsyms: Always initialize modbuildid

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
-- 
2.50.1