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authorLinus Torvalds <torvalds@linux-foundation.org>2018-11-30 10:57:06 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-11-30 10:57:06 -0800
commit575d7d0d6f5c6feb896fae2e70578a1ab6d474b5 (patch)
treecbfbf7baadefcb441d4e43484f074934f620aab1 /tools
parentMerge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs (diff)
parentobjtool: Fix segfault in .cold detection with -ffunction-sections (diff)
downloadlinux-dev-575d7d0d6f5c6feb896fae2e70578a1ab6d474b5.tar.xz
linux-dev-575d7d0d6f5c6feb896fae2e70578a1ab6d474b5.zip
Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull objtool fixes from Ingo Molnar: "Two fixes for boundary conditions" * 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: objtool: Fix segfault in .cold detection with -ffunction-sections objtool: Fix double-free in .cold detection error path
Diffstat (limited to 'tools')
-rw-r--r--tools/objtool/elf.c19
1 files changed, 15 insertions, 4 deletions
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index 6dbb9fae0f9d..b8f3cca8e58b 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -31,6 +31,8 @@
#include "elf.h"
#include "warn.h"
+#define MAX_NAME_LEN 128
+
struct section *find_section_by_name(struct elf *elf, const char *name)
{
struct section *sec;
@@ -298,6 +300,8 @@ static int read_symbols(struct elf *elf)
/* Create parent/child links for any cold subfunctions */
list_for_each_entry(sec, &elf->sections, list) {
list_for_each_entry(sym, &sec->symbol_list, list) {
+ char pname[MAX_NAME_LEN + 1];
+ size_t pnamelen;
if (sym->type != STT_FUNC)
continue;
sym->pfunc = sym->cfunc = sym;
@@ -305,14 +309,21 @@ static int read_symbols(struct elf *elf)
if (!coldstr)
continue;
- coldstr[0] = '\0';
- pfunc = find_symbol_by_name(elf, sym->name);
- coldstr[0] = '.';
+ 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);
+ return -1;
+ }
+
+ strncpy(pname, sym->name, pnamelen);
+ pname[pnamelen] = '\0';
+ pfunc = find_symbol_by_name(elf, pname);
if (!pfunc) {
WARN("%s(): can't find parent function",
sym->name);
- goto err;
+ return -1;
}
sym->pfunc = pfunc;