Extend elf-parse to be able to read the symbol table of vmlinux in
kallsyms.
This requires the ability to open ELF files in read-only mode, so provide
elf_map_ro() to do so.
It also requires accessors for section flags and symbol bindings, so
provide these via shdr_flags() and sym_bind().
It's useful to be able to open an ELF file, map it, and then have easy
access to its section headers, names and symbol table, so introduce struct
elf_file to store this.
In order to obtain this data also provide elf_open_ro() and elf_close().
Also, check for the file being an ELF file first in elf_parse(). This is
the logical thing to check for first, but additionally prevents kallsyms
from having to check this it self.
Assisted-by: LLM
Reviewed-by: Kees Cook <kees@kernel.org>
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Link: https://patch.msgid.link/20260923-build-speedup-v4-7-73128809a4a4@kernel.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
In order to share the elf parsing that is in sorttable.c so that other
programs could use the same code, move it into elf-parse.c and
elf-parse.h.
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nicolas Schier <nicolas.schier@linux.dev>
Cc: Nick Desaulniers <nick.desaulniers+lkml@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Link: https://lore.kernel.org/20251022004452.752298788@kernel.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
