[PATCH v4 04/36] scripts/kallysms: Always include __start and __stop symbols
From: Suren Baghdasaryan <surenb@google.com>
Date: 2024-02-21 19:41:06
Also in:
cgroups, linux-arch, linux-doc, linux-fsdevel, linux-iommu, linux-mm, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Kent Overstreet <kent.overstreet@linux.dev> These symbols are used to denote section boundaries: by always including them we can unify loading sections from modules with loading built-in sections, which leads to some significant cleanup. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev> Signed-off-by: Suren Baghdasaryan <surenb@google.com> Reviewed-by: Kees Cook <redacted> --- scripts/kallsyms.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 653b92f6d4c8..47978efe4797 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c@@ -204,6 +204,11 @@ static int symbol_in_range(const struct sym_entry *s, return 0; } +static bool string_starts_with(const char *s, const char *prefix) +{ + return strncmp(s, prefix, strlen(prefix)) == 0; +} + static int symbol_valid(const struct sym_entry *s) { const char *name = sym_name(s);
@@ -211,6 +216,14 @@ static int symbol_valid(const struct sym_entry *s) /* if --all-symbols is not specified, then symbols outside the text * and inittext sections are discarded */ if (!all_symbols) { + /* + * Symbols starting with __start and __stop are used to denote + * section boundaries, and should always be included: + */ + if (string_starts_with(name, "__start_") || + string_starts_with(name, "__stop_")) + return 1; + if (symbol_in_range(s, text_ranges, ARRAY_SIZE(text_ranges)) == 0) return 0;
--
2.44.0.rc0.258.g7320e95886-goog