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authorPeter Zijlstra <peterz@infradead.org>2019-04-03 10:39:50 +0300
committerIngo Molnar <mingo@kernel.org>2019-04-03 12:02:24 +0300
commit57b78a62e7f23c4686fe54091cdc3d12e60d6513 (patch)
treed8ac655da75b7a72365c7226b93e78c06d0c9204 /mm/kasan/report.c
parenta936af8ea3580855adcc80daa8e01c0196afeb15 (diff)
downloadlinux-57b78a62e7f23c4686fe54091cdc3d12e60d6513.tar.xz
x86/uaccess, kasan: Fix KASAN vs SMAP
KASAN inserts extra code for every LOAD/STORE emitted by te compiler. Much of this code is simple and safe to run with AC=1, however the kasan_report() function, called on error, is most certainly not safe to call with AC=1. Therefore wrap kasan_report() in user_access_{save,restore}; which for x86 SMAP, saves/restores EFLAGS and clears AC before calling the real function. Also ensure all the functions are without __fentry__ hook. The function tracer is also not safe. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm/kasan/report.c')
-rw-r--r--mm/kasan/report.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index ca9418fe9232..0772820ad098 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -281,8 +281,7 @@ void kasan_report_invalid_free(void *object, unsigned long ip)
end_report(&flags);
}
-void kasan_report(unsigned long addr, size_t size,
- bool is_write, unsigned long ip)
+void __kasan_report(unsigned long addr, size_t size, bool is_write, unsigned long ip)
{
struct kasan_access_info info;
void *tagged_addr;