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Message-Id: <20200623172327.5701-2-kristen@linux.intel.com>
Date: Tue, 23 Jun 2020 10:23:18 -0700
From: Kristen Carlson Accardi <kristen@...ux.intel.com>
To: keescook@...omium.org,
tglx@...utronix.de,
mingo@...hat.com,
bp@...en8.de,
Josh Poimboeuf <jpoimboe@...hat.com>,
Peter Zijlstra <peterz@...radead.org>
Cc: arjan@...ux.intel.com,
x86@...nel.org,
linux-kernel@...r.kernel.org,
kernel-hardening@...ts.openwall.com,
rick.p.edgecombe@...el.com,
Kristen Carlson Accardi <kristen@...ux.intel.com>
Subject: [PATCH v3 01/10] objtool: Do not assume order of parent/child functions
If a .cold function is examined prior to it's parent, the link
to the parent/child function can be overwritten when the parent
is examined. Only update pfunc and cfunc if they were previously
nil to prevent this from happening.
Signed-off-by: Kristen Carlson Accardi <kristen@...ux.intel.com>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
tools/objtool/elf.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index 84225679f96d..f953d3a15612 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -434,7 +434,13 @@ static int read_symbols(struct elf *elf)
size_t pnamelen;
if (sym->type != STT_FUNC)
continue;
- sym->pfunc = sym->cfunc = sym;
+
+ if (sym->pfunc == NULL)
+ sym->pfunc = sym;
+
+ if (sym->cfunc == NULL)
+ sym->cfunc = sym;
+
coldstr = strstr(sym->name, ".cold");
if (!coldstr)
continue;
--
2.20.1
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