From: Ingo Molnar <mingo@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org,
Josh Poimboeuf <jpoimboe@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Borislav Petkov <bp@alien8.de>,
Andrew Morton <akpm@linux-foundation.org>
Subject: [GIT PULL] objtool fixes
Date: Fri, 30 Nov 2018 07:18:53 +0100 [thread overview]
Message-ID: <20181130061853.GA19395@gmail.com> (raw)
Linus,
Please pull the latest core-urgent-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-urgent-for-linus
# HEAD: 22566c1603030f0a036ad564634b064ad1a55db2 objtool: Fix segfault in .cold detection with -ffunction-sections
Two fixes for boundary conditions.
Thanks,
Ingo
------------------>
Artem Savkov (2):
objtool: Fix double-free in .cold detection error path
objtool: Fix segfault in .cold detection with -ffunction-sections
tools/objtool/elf.c | 19 +++++++++++++++----
1 file 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;
next reply other threads:[~2018-11-30 6:19 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-30 6:18 Ingo Molnar [this message]
2018-11-30 21:00 ` [GIT PULL] objtool fixes pr-tracker-bot
-- strict thread matches above, loose matches on Subject: below --
2021-06-24 6:54 Ingo Molnar
2021-06-24 16:34 ` pr-tracker-bot
2021-06-12 12:37 Ingo Molnar
2021-06-12 19:09 ` pr-tracker-bot
2021-05-15 7:46 Ingo Molnar
2021-05-15 17:55 ` pr-tracker-bot
2020-04-25 9:04 Ingo Molnar
2020-04-25 19:30 ` pr-tracker-bot
2017-11-26 12:34 Ingo Molnar
2017-03-01 22:01 Ingo Molnar
2017-02-28 7:53 Ingo Molnar
2017-03-01 1:55 ` Linus Torvalds
2017-03-01 6:05 ` Josh Poimboeuf
2016-04-23 11:10 Ingo Molnar
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