Re: [PATCH] kasan: add __asan_report_loadN/storeN_noabort callbacks
On Tue, Jan 23, 2018 at 11:44 AM, Andrey Ryabininwrote: > On 01/19/2018 08:44 PM, Andrey Konovalov wrote: >> Instead of __asan_report_load_n_noabort and __asan_report_store_n_noabort >> callbacks Clang emits differently named __asan_report_loadN_noabort and >> __asan_report_storeN_noabort (similar to __asan_loadN/storeN_noabort, whose >> names both GCC and Clang agree on). >> >> Add callback implementation for __asan_report_loadN/storeN_noabort. >> > > This made me wonder why this wasn't observed before. So I noticed that > inline instrumentation with -fsanitize=kernel-addresss is broken in clang, > and clang never calls __asan_report*() functions. I see that you guys fixed > this > just yesterday https://reviews.llvm.org/D42384 . Correct. > > But it seems that you didn't fix the rest of "if (CompileKernel)" crap. > Clang generates "__asan_report_[load,store]N*" instead of > "__asan_report_[load,store]_n*" > only because of this idiocy: > > const std::string SuffixStr = CompileKernel ? "N" : "_n"; > > See > https://github.com/llvm-mirror/llvm/blob/ca19eaabd75f55865efd321b7a6f1d4ba3db8bc8/lib/Transforms/Instrumentation/AddressSanitizer.cpp#L2250 > > Note that SuffixStr is used *only* for __asan_report_* callbacks, which makes > no sense because > we never ever had __asan_report* callbacks with "N" suffix. > > So I think that you should just fix the llvm here. I think you are right. I thought that GCC uses different and inconsistent callback names for the kernel and user space, but that doesn't seem to be the case. I submitted an LLVM change: https://reviews.llvm.org/D42423 Please discard this patch. > > And there is probably one more "if (CompileKernel)" crap in runOnModule() > which breaks globals instrumentation. Right, this will be fixed at some point. > > >
Re: [PATCH] kasan: add __asan_report_loadN/storeN_noabort callbacks
On Tue, Jan 23, 2018 at 11:44 AM, Andrey Ryabinin wrote: > On 01/19/2018 08:44 PM, Andrey Konovalov wrote: >> Instead of __asan_report_load_n_noabort and __asan_report_store_n_noabort >> callbacks Clang emits differently named __asan_report_loadN_noabort and >> __asan_report_storeN_noabort (similar to __asan_loadN/storeN_noabort, whose >> names both GCC and Clang agree on). >> >> Add callback implementation for __asan_report_loadN/storeN_noabort. >> > > This made me wonder why this wasn't observed before. So I noticed that > inline instrumentation with -fsanitize=kernel-addresss is broken in clang, > and clang never calls __asan_report*() functions. I see that you guys fixed > this > just yesterday https://reviews.llvm.org/D42384 . Correct. > > But it seems that you didn't fix the rest of "if (CompileKernel)" crap. > Clang generates "__asan_report_[load,store]N*" instead of > "__asan_report_[load,store]_n*" > only because of this idiocy: > > const std::string SuffixStr = CompileKernel ? "N" : "_n"; > > See > https://github.com/llvm-mirror/llvm/blob/ca19eaabd75f55865efd321b7a6f1d4ba3db8bc8/lib/Transforms/Instrumentation/AddressSanitizer.cpp#L2250 > > Note that SuffixStr is used *only* for __asan_report_* callbacks, which makes > no sense because > we never ever had __asan_report* callbacks with "N" suffix. > > So I think that you should just fix the llvm here. I think you are right. I thought that GCC uses different and inconsistent callback names for the kernel and user space, but that doesn't seem to be the case. I submitted an LLVM change: https://reviews.llvm.org/D42423 Please discard this patch. > > And there is probably one more "if (CompileKernel)" crap in runOnModule() > which breaks globals instrumentation. Right, this will be fixed at some point. > > >
Re: [PATCH] kasan: add __asan_report_loadN/storeN_noabort callbacks
On 01/19/2018 08:44 PM, Andrey Konovalov wrote: > Instead of __asan_report_load_n_noabort and __asan_report_store_n_noabort > callbacks Clang emits differently named __asan_report_loadN_noabort and > __asan_report_storeN_noabort (similar to __asan_loadN/storeN_noabort, whose > names both GCC and Clang agree on). > > Add callback implementation for __asan_report_loadN/storeN_noabort. > This made me wonder why this wasn't observed before. So I noticed that inline instrumentation with -fsanitize=kernel-addresss is broken in clang, and clang never calls __asan_report*() functions. I see that you guys fixed this just yesterday https://reviews.llvm.org/D42384 . But it seems that you didn't fix the rest of "if (CompileKernel)" crap. Clang generates "__asan_report_[load,store]N*" instead of "__asan_report_[load,store]_n*" only because of this idiocy: const std::string SuffixStr = CompileKernel ? "N" : "_n"; See https://github.com/llvm-mirror/llvm/blob/ca19eaabd75f55865efd321b7a6f1d4ba3db8bc8/lib/Transforms/Instrumentation/AddressSanitizer.cpp#L2250 Note that SuffixStr is used *only* for __asan_report_* callbacks, which makes no sense because we never ever had __asan_report* callbacks with "N" suffix. So I think that you should just fix the llvm here. And there is probably one more "if (CompileKernel)" crap in runOnModule() which breaks globals instrumentation.
Re: [PATCH] kasan: add __asan_report_loadN/storeN_noabort callbacks
On 01/19/2018 08:44 PM, Andrey Konovalov wrote: > Instead of __asan_report_load_n_noabort and __asan_report_store_n_noabort > callbacks Clang emits differently named __asan_report_loadN_noabort and > __asan_report_storeN_noabort (similar to __asan_loadN/storeN_noabort, whose > names both GCC and Clang agree on). > > Add callback implementation for __asan_report_loadN/storeN_noabort. > This made me wonder why this wasn't observed before. So I noticed that inline instrumentation with -fsanitize=kernel-addresss is broken in clang, and clang never calls __asan_report*() functions. I see that you guys fixed this just yesterday https://reviews.llvm.org/D42384 . But it seems that you didn't fix the rest of "if (CompileKernel)" crap. Clang generates "__asan_report_[load,store]N*" instead of "__asan_report_[load,store]_n*" only because of this idiocy: const std::string SuffixStr = CompileKernel ? "N" : "_n"; See https://github.com/llvm-mirror/llvm/blob/ca19eaabd75f55865efd321b7a6f1d4ba3db8bc8/lib/Transforms/Instrumentation/AddressSanitizer.cpp#L2250 Note that SuffixStr is used *only* for __asan_report_* callbacks, which makes no sense because we never ever had __asan_report* callbacks with "N" suffix. So I think that you should just fix the llvm here. And there is probably one more "if (CompileKernel)" crap in runOnModule() which breaks globals instrumentation.
[PATCH] kasan: add __asan_report_loadN/storeN_noabort callbacks
Instead of __asan_report_load_n_noabort and __asan_report_store_n_noabort callbacks Clang emits differently named __asan_report_loadN_noabort and __asan_report_storeN_noabort (similar to __asan_loadN/storeN_noabort, whose names both GCC and Clang agree on). Add callback implementation for __asan_report_loadN/storeN_noabort. Signed-off-by: Andrey Konovalov--- mm/kasan/report.c | 12 1 file changed, 12 insertions(+) diff --git a/mm/kasan/report.c b/mm/kasan/report.c index eff12e040498..caf4c9e948c6 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -450,3 +450,15 @@ void __asan_report_store_n_noabort(unsigned long addr, size_t size) kasan_report(addr, size, true, _RET_IP_); } EXPORT_SYMBOL(__asan_report_store_n_noabort); + +void __asan_report_loadN_noabort(unsigned long addr, size_t size) +{ + kasan_report(addr, size, false, _RET_IP_); +} +EXPORT_SYMBOL(__asan_report_loadN_noabort); + +void __asan_report_storeN_noabort(unsigned long addr, size_t size) +{ + kasan_report(addr, size, true, _RET_IP_); +} +EXPORT_SYMBOL(__asan_report_storeN_noabort); -- 2.16.0.rc1.238.g530d649a79-goog
[PATCH] kasan: add __asan_report_loadN/storeN_noabort callbacks
Instead of __asan_report_load_n_noabort and __asan_report_store_n_noabort callbacks Clang emits differently named __asan_report_loadN_noabort and __asan_report_storeN_noabort (similar to __asan_loadN/storeN_noabort, whose names both GCC and Clang agree on). Add callback implementation for __asan_report_loadN/storeN_noabort. Signed-off-by: Andrey Konovalov --- mm/kasan/report.c | 12 1 file changed, 12 insertions(+) diff --git a/mm/kasan/report.c b/mm/kasan/report.c index eff12e040498..caf4c9e948c6 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -450,3 +450,15 @@ void __asan_report_store_n_noabort(unsigned long addr, size_t size) kasan_report(addr, size, true, _RET_IP_); } EXPORT_SYMBOL(__asan_report_store_n_noabort); + +void __asan_report_loadN_noabort(unsigned long addr, size_t size) +{ + kasan_report(addr, size, false, _RET_IP_); +} +EXPORT_SYMBOL(__asan_report_loadN_noabort); + +void __asan_report_storeN_noabort(unsigned long addr, size_t size) +{ + kasan_report(addr, size, true, _RET_IP_); +} +EXPORT_SYMBOL(__asan_report_storeN_noabort); -- 2.16.0.rc1.238.g530d649a79-goog