On Fri, Nov 18, 2022 at 12:53 PM Sami Tolvanen <samitolvanen@xxxxxxxxxx> wrote: > > On Fri, Nov 18, 2022 at 12:27 PM Sami Tolvanen <samitolvanen@xxxxxxxxxx> wrote: > > > > On Fri, Nov 18, 2022 at 12:10 PM Eric Biggers <ebiggers@xxxxxxxxxx> wrote: > > > Sami, is it expected that a CFI check isn't being generated for the indirect > > > call to 'func' in sm4_avx_cbc_decrypt()? I'm using LLVM commit 4a7be42d922af0. > > > > If the compiler emits an indirect call, it should also emit a CFI > > check. What's the assembly code it generates here? > > With CONFIG_RETPOLINE, the check is emitted as expected, but I can > reproduce this issue without retpolines. It looks like the cfi-type > attribute is dropped from the machine instruction in one of the X86 > specific passes. I'll take a look. This should now be fixed in ToT LLVM after commit 7c96f61aaa4c. Thanks for spotting the issue! Sami
