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[sanitizer] Add early call handling to strlen interceptor 

Summary:
The strlen interceptor is sometimes invoked too early for REAL(strlen) to
be initialized.  A special check is added to use internal_strlen for this
situation.

Reviewers: dim

Subscribers: llvm-commits, samsonov

Differential Revision: http://reviews.llvm.org/D18851

Change-Id: I3acc58f4abbae1904f25324abd84efea67aad0a2
llvm-svn: 265705
This commit is contained in:
Derek Bruening 2016-04-07 18:07:09 +00:00
parent 42795bdc76
commit a7685389c8
1 changed files with 6 additions and 0 deletions
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6
compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
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@ -206,6 +206,12 @@ UNUSED static void DeleteInterceptorMetadata(void *addr) {
#if SANITIZER_INTERCEPT_STRLEN
INTERCEPTOR(SIZE_T, strlen, const char *s) {
// Sometimes strlen is called prior to InitializeCommonInterceptors,
// in which case the REAL(strlen) typically used in
// COMMON_INTERCEPTOR_ENTER will fail. We use internal_strlen here
// to handle that.
if (COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED)
return internal_strlen(s);
void *ctx;
COMMON_INTERCEPTOR_ENTER(ctx, strlen, s);
SIZE_T result = REAL(strlen)(s);