From: Claus Stovgaard <claus.stovga...@gmail.com> When using the gcc-sanitizers as part of the SDK on a Linux with a newer kernel, the ASAN fails randomly. This was seen on Ubuntu 22.04.
This is also described at https://stackoverflow.com/questions/77894856/possible-bug-in-gcc-sanitizers Backport the fix from LLVM project, as gcc has not yet backported anything for the 11 series. Signed-off-by: Claus Stovgaard <claus.stovga...@gmail.com> Signed-off-by: Steve Sakoman <st...@sakoman.com> --- meta/recipes-devtools/gcc/gcc-11.4.inc | 1 + .../gcc/gcc/0031-gcc-sanitizers-fix.patch | 63 +++++++++++++++++++ 2 files changed, 64 insertions(+) create mode 100644 meta/recipes-devtools/gcc/gcc/0031-gcc-sanitizers-fix.patch diff --git a/meta/recipes-devtools/gcc/gcc-11.4.inc b/meta/recipes-devtools/gcc/gcc-11.4.inc index 88310e6b79..fd6a3e92e3 100644 --- a/meta/recipes-devtools/gcc/gcc-11.4.inc +++ b/meta/recipes-devtools/gcc/gcc-11.4.inc @@ -59,6 +59,7 @@ SRC_URI = "\ file://0028-debug-101473-apply-debug-prefix-maps-before-checksum.patch \ file://0029-Fix-install-path-of-linux64.h.patch \ file://0030-rust-recursion-limit.patch \ + file://0031-gcc-sanitizers-fix.patch \ file://0001-CVE-2021-42574.patch \ file://0002-CVE-2021-42574.patch \ file://0003-CVE-2021-42574.patch \ diff --git a/meta/recipes-devtools/gcc/gcc/0031-gcc-sanitizers-fix.patch b/meta/recipes-devtools/gcc/gcc/0031-gcc-sanitizers-fix.patch new file mode 100644 index 0000000000..d63618132a --- /dev/null +++ b/meta/recipes-devtools/gcc/gcc/0031-gcc-sanitizers-fix.patch @@ -0,0 +1,63 @@ +From fb77ca05ffb4f8e666878f2f6718a9fb4d686839 Mon Sep 17 00:00:00 2001 +From: Thurston Dang <thurs...@google.com> +Date: Thu, 13 Apr 2023 23:55:01 +0000 +Subject: [PATCH] Re-land 'ASan: move allocator base to avoid conflict with + high-entropy ASLR for x86-64 Linux' + +D147984 was reverted because it broke lit tests on Mac. This revision is based on D147984 +but maintains the old behavior for Apple. + +Note that, per the follow-up discussion with MaskRay in D147984, this patch excludes Apple +but includes other platforms (e.g., aarch64, MIPS64) and OSes (e.g., FreeBSD, S390X), not just +x86-64 Linux. + +Original commit message from D147984: + +Users have discovered [*] that when CONFIG_ARCH_MMAP_RND_BITS == 32, +it will frequently conflict with ASan's allocator on x86-64 Linux, because the +PIE program segment base address of 0x555555555554 plus an ASLR shift of up to +((2**32) * 4K == 0x100000000000) will sometimes exceed ASan's hardcoded +base address of 0x600000000000. We fix this by simply moving the allocator base +to 0x500000000000, which is below the PIE program segment base address. This is +cleaner than trying to move it to another location that is sandwiched between +the PIE program and library segments, because if either of those grow too large, +it will collide with the allocator region. + +Note that we will never need to change this base address again (unless we want to increase +the size of the allocator), because ASLR cannot be set above 32-bits for x86-64 Linux (the +PIE program segment and library segments would collide with each other; see also +ARCH_MMAP_RND_BITS_MAX in https://github.com/torvalds/linux/blob/master/arch/x86/Kconfig). + +[*] see https://b.corp.google.com/issues/276925478 +and https://groups.google.com/a/google.com/g/chrome-os-gardeners/c/BbfzCP3dEeo/m/h3C_vVUxCQAJ + +Differential Revision: https://reviews.llvm.org/D148280 + +Upstream-Status: Backport from llvm-project: https://github.com/llvm/llvm-project/commit/fb77ca05ffb4f8e666878f2f6718a9fb4d686839 +Signed-off-by: Claus Stovgaard <claus.stovga...@gmail.com> +--- + libsanitizer/asan/asan_allocator.h | 8 ++++++-- + 1 file changed, 6 insertions(+), 2 deletions(-) + +diff --git a/libsanitizer/asan/asan_allocator.h b/libsanitizer/asan/asan_allocator.h +index 0b4dbf03bb9d53..6a12a6c6025283 100644 +--- a/libsanitizer/asan/asan_allocator.h ++++ b/libsanitizer/asan/asan_allocator.h +@@ -143,11 +143,15 @@ typedef DefaultSizeClassMap SizeClassMap; + const uptr kAllocatorSpace = ~(uptr)0; + const uptr kAllocatorSize = 0x8000000000ULL; // 500G + typedef DefaultSizeClassMap SizeClassMap; +-# else ++# elif SANITIZER_APPLE + const uptr kAllocatorSpace = 0x600000000000ULL; + const uptr kAllocatorSize = 0x40000000000ULL; // 4T. + typedef DefaultSizeClassMap SizeClassMap; +-# endif ++# else ++const uptr kAllocatorSpace = 0x500000000000ULL; ++const uptr kAllocatorSize = 0x40000000000ULL; // 4T. ++typedef DefaultSizeClassMap SizeClassMap; ++# endif + template <typename AddressSpaceViewTy> + struct AP64 { // Allocator64 parameters. Deliberately using a short name. + static const uptr kSpaceBeg = kAllocatorSpace; -- 2.34.1
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