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authorJosh Poimboeuf <jpoimboe@redhat.com>2019-07-17 20:36:48 -0500
committerThomas Gleixner <tglx@linutronix.de>2019-07-18 21:01:07 +0200
commite10cd8fe8ddfd28a172d2be57ae0e90c7f752e6a (patch)
tree819c6225b6167c23c52a230860eb4424157146d9 /tools
parentc705cecc8431951b4f34178e6b1db51b4a504c43 (diff)
objtool: Refactor function alias logic
- Add an alias check in validate_functions(). With this change, aliases no longer need uaccess_safe set. - Add an alias check in decode_instructions(). With this change, the "if (!insn->func)" check is no longer needed. - Don't create aliases for zero-length functions, as it can have unexpected results. The next patch will spit out a warning for zero-length functions anyway. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/26a99c31426540f19c9a58b9e10727c385a147bc.1563413318.git.jpoimboe@redhat.com
Diffstat (limited to 'tools')
-rw-r--r--tools/objtool/check.c16
-rw-r--r--tools/objtool/elf.c2
2 files changed, 10 insertions, 8 deletions
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index d8a1ce80fded..3f8664b0e3f9 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -276,7 +276,7 @@ static int decode_instructions(struct objtool_file *file)
}
list_for_each_entry(func, &sec->symbol_list, list) {
- if (func->type != STT_FUNC)
+ if (func->type != STT_FUNC || func->alias != func)
continue;
if (!find_insn(file, sec, func->offset)) {
@@ -286,8 +286,7 @@ static int decode_instructions(struct objtool_file *file)
}
func_for_each_insn(file, func, insn)
- if (!insn->func)
- insn->func = func;
+ insn->func = func;
}
}
@@ -508,7 +507,7 @@ static void add_uaccess_safe(struct objtool_file *file)
if (!func)
continue;
- func->alias->uaccess_safe = true;
+ func->uaccess_safe = true;
}
}
@@ -1887,7 +1886,7 @@ static bool insn_state_match(struct instruction *insn, struct insn_state *state)
static inline bool func_uaccess_safe(struct symbol *func)
{
if (func)
- return func->alias->uaccess_safe;
+ return func->uaccess_safe;
return false;
}
@@ -2355,14 +2354,17 @@ static int validate_functions(struct objtool_file *file)
for_each_sec(file, sec) {
list_for_each_entry(func, &sec->symbol_list, list) {
- if (func->type != STT_FUNC || func->pfunc != func)
+ if (func->type != STT_FUNC)
+ continue;
+
+ if (func->pfunc != func || func->alias != func)
continue;
insn = find_insn(file, sec, func->offset);
if (!insn || insn->ignore || insn->visited)
continue;
- state.uaccess = func->alias->uaccess_safe;
+ state.uaccess = func->uaccess_safe;
ret = validate_branch(file, func, insn, state);
if (ret && backtrace)
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index e18698262837..9194732a673d 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -278,7 +278,7 @@ static int read_symbols(struct elf *elf)
}
if (sym->offset == s->offset) {
- if (sym->len == s->len && alias == sym)
+ if (sym->len && sym->len == s->len && alias == sym)
alias = s;
if (sym->len >= s->len) {