module: validate string table section types

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In elf_validity_cache_sechdrs, section sizes and offsets are validated,
unless the section type is SHT_NULL or SHT_NOBITS.

Later, elf_validity_cache_secstrings and elf_validity_cache_index_str
access the section name table (.shstrtab) and symbol string table
(.strtab) headers without first ensuring that their types are
SHT_STRTAB. If a section type is SHT_NULL or SHT_NOBITS, sh_offset has
not been validated and may reference out-of-bounds memory when
dereferenced in elf_validity_cache_secstrings or
elf_validity_cache_strtab.

Validate that both string section headers are of type SHT_STRTAB before
caching them.

Cc: stable@vger.kernel.org
Signed-off-by: Thiébaud Weksteen <tweek@google.com>
Reviewed-by: Aaron Tomlin <atomlin@atomlin.com>
Reviewed-by: Petr Pavlu <petr.pavlu@suse.com>
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>

...

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Thiébaud Weksteen 2026-07-08 11:21:07 +10:00 • committed by Petr Pavlu

parent 2a7ecc5fbd

commit 9a5ff45689

1 changed files with 13 additions and 1 deletions

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kernel/module/main.c

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