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Fix asan with libc6 >= 2.24 (asan-glibc-2.24.diff, backport of 269633)

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Many thanks to Michael Stapelberg for the great bug report.
(Closes: 836723)
This commit is contained in:
Sylvestre Ledru 2016-09-05 06:59:12 +00:00
parent 62e6228624
commit 049d79eff7
3 changed files with 90 additions and 0 deletions
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8
debian/changelog vendored
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@ -1,3 +1,11 @@
llvm-toolchain-3.8 (1:3.8.1-11) UNRELEASED; urgency=medium
* Fix asan with libc6 >= 2.24 (asan-glibc-2.24.diff, backport of 269633)
Many thanks to Michael Stapelberg for the great bug report.
(Closes: 836723)
-- Sylvestre Ledru <sylvestre@debian.org> Mon, 05 Sep 2016 08:57:48 +0200
llvm-toolchain-3.8 (1:3.8.1-10) unstable; urgency=medium
* Fix the usage of jsoncpp in polly. Thanks to James Clarke for the patch

81
debian/patches/asan-glibc-2.24.diff vendored Normal file
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@ -0,0 +1,81 @@
Index: llvm-toolchain-3.8-3.8.1/compiler-rt/lib/asan/asan_malloc_linux.cc
===================================================================
--- llvm-toolchain-3.8-3.8.1.orig/compiler-rt/lib/asan/asan_malloc_linux.cc
+++ llvm-toolchain-3.8-3.8.1/compiler-rt/lib/asan/asan_malloc_linux.cc
@@ -26,52 +26,58 @@
// ---------------------- Replacement functions ---------------- {{{1
using namespace __asan; // NOLINT
-static const uptr kCallocPoolSize = 1024;
-static uptr calloc_memory_for_dlsym[kCallocPoolSize];
+static uptr allocated_for_dlsym;
+static const uptr kDlsymAllocPoolSize = 1024;
+static uptr alloc_memory_for_dlsym[kDlsymAllocPoolSize];
+
+static bool IsInDlsymAllocPool(const void *ptr) {
+ uptr off = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
+ return off < sizeof(alloc_memory_for_dlsym);
+}
-static bool IsInCallocPool(const void *ptr) {
- sptr off = (sptr)ptr - (sptr)calloc_memory_for_dlsym;
- return 0 <= off && off < (sptr)kCallocPoolSize;
+static void *AllocateFromLocalPool(uptr size_in_bytes) {
+ uptr size_in_words = RoundUpTo(size_in_bytes, kWordSize) / kWordSize;
+ void *mem = (void*)&alloc_memory_for_dlsym[allocated_for_dlsym];
+ allocated_for_dlsym += size_in_words;
+ CHECK_LT(allocated_for_dlsym, kDlsymAllocPoolSize);
+ return mem;
}
INTERCEPTOR(void, free, void *ptr) {
GET_STACK_TRACE_FREE;
- if (UNLIKELY(IsInCallocPool(ptr)))
+ if (UNLIKELY(IsInDlsymAllocPool(ptr)))
return;
asan_free(ptr, &stack, FROM_MALLOC);
}
INTERCEPTOR(void, cfree, void *ptr) {
GET_STACK_TRACE_FREE;
- if (UNLIKELY(IsInCallocPool(ptr)))
+ if (UNLIKELY(IsInDlsymAllocPool(ptr)))
return;
asan_free(ptr, &stack, FROM_MALLOC);
}
INTERCEPTOR(void*, malloc, uptr size) {
+ if (UNLIKELY(!asan_inited))
+ // Hack: dlsym calls malloc before REAL(malloc) is retrieved from dlsym.
+ return AllocateFromLocalPool(size);
GET_STACK_TRACE_MALLOC;
return asan_malloc(size, &stack);
}
INTERCEPTOR(void*, calloc, uptr nmemb, uptr size) {
- if (UNLIKELY(!asan_inited)) {
+ if (UNLIKELY(!asan_inited))
// Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym.
- static uptr allocated;
- uptr size_in_words = ((nmemb * size) + kWordSize - 1) / kWordSize;
- void *mem = (void*)&calloc_memory_for_dlsym[allocated];
- allocated += size_in_words;
- CHECK(allocated < kCallocPoolSize);
- return mem;
- }
+ return AllocateFromLocalPool(nmemb * size);
GET_STACK_TRACE_MALLOC;
return asan_calloc(nmemb, size, &stack);
}
INTERCEPTOR(void*, realloc, void *ptr, uptr size) {
GET_STACK_TRACE_MALLOC;
- if (UNLIKELY(IsInCallocPool(ptr))) {
- uptr offset = (uptr)ptr - (uptr)calloc_memory_for_dlsym;
- uptr copy_size = Min(size, kCallocPoolSize - offset);
+ if (UNLIKELY(IsInDlsymAllocPool(ptr))) {
+ uptr offset = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
+ uptr copy_size = Min(size, kDlsymAllocPoolSize - offset);
void *new_ptr = asan_malloc(size, &stack);
internal_memcpy(new_ptr, ptr, copy_size);
return new_ptr;

1
debian/patches/series vendored
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@ -45,3 +45,4 @@ lldb-link-atomic-cmake.patch
D17567-PR23529-Sema-part-of-attrbute-abi_tag-support.diff
D18035-PR23529-Mangler-part-of-attrbute-abi_tag-support.diff
kfreebsd-support.diff
asan-glibc-2.24.diff