From f404a58dcf0c862b05602f641ce5fdd8b98fbc3a Mon Sep 17 00:00:00 2001 From: Aaron Plattner Date: Wed, 4 Oct 2023 17:08:19 -0700 Subject: objtool: Remove max symbol name length limitation If one of the symbols processed by read_symbols() happens to have a .cold variant with a name longer than objtool's MAX_NAME_LEN limit, the build fails. Avoid this problem by just using strndup() to copy the parent function's name, rather than strncpy()ing it onto the stack. Signed-off-by: Aaron Plattner Link: https://lore.kernel.org/r/41e94cfea1d9131b758dd637fecdeacd459d4584.1696355111.git.aplattner@nvidia.com Signed-off-by: Josh Poimboeuf --- tools/objtool/elf.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c index 081befa4674b..3d27983dc908 100644 --- a/tools/objtool/elf.c +++ b/tools/objtool/elf.c @@ -22,8 +22,6 @@ #include #include -#define MAX_NAME_LEN 128 - static inline u32 str_hash(const char *str) { return jhash(str, strlen(str), 0); @@ -515,7 +513,7 @@ static int read_symbols(struct elf *elf) /* Create parent/child links for any cold subfunctions */ list_for_each_entry(sec, &elf->sections, list) { sec_for_each_sym(sec, sym) { - char pname[MAX_NAME_LEN + 1]; + char *pname; size_t pnamelen; if (sym->type != STT_FUNC) continue; @@ -531,15 +529,15 @@ static int read_symbols(struct elf *elf) continue; pnamelen = coldstr - sym->name; - if (pnamelen > MAX_NAME_LEN) { - WARN("%s(): parent function name exceeds maximum length of %d characters", - sym->name, MAX_NAME_LEN); + pname = strndup(sym->name, pnamelen); + if (!pname) { + WARN("%s(): failed to allocate memory", + sym->name); return -1; } - strncpy(pname, sym->name, pnamelen); - pname[pnamelen] = '\0'; pfunc = find_symbol_by_name(elf, pname); + free(pname); if (!pfunc) { WARN("%s(): can't find parent function", -- cgit