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Peter Anvin" , "Andrew Morton" , "Liam R. Howlett" , "Vlastimil Babka" , "Lorenzo Stoakes" , "Paul Walmsley" , "Palmer Dabbelt" , "Albert Ou" , "Conor Dooley" , "Rob Herring" , "Krzysztof Kozlowski" , "Arnd Bergmann" , "Christian Brauner" , "Peter Zijlstra" , "Oleg Nesterov" , "Eric Biederman" , "Kees Cook" , "Jonathan Corbet" , "Shuah Khan" , "Jann Horn" , "Conor Dooley" From: =?utf-8?q?Radim_Kr=C4=8Dm=C3=A1=C5=99?= Subject: Re: [PATCH v12 17/28] riscv/signal: save and restore of shadow stack for signal Cc: , , , , , , , , , , , , , , , , , , , , , "linux-riscv" References: <20250314-v5_user_cfi_series-v12-0-e51202b53138@rivosinc.com> <20250314-v5_user_cfi_series-v12-17-e51202b53138@rivosinc.com> In-Reply-To: <20250314-v5_user_cfi_series-v12-17-e51202b53138@rivosinc.com> 2025-03-14T14:39:36-07:00, Deepak Gupta : > diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c > @@ -140,6 +142,62 @@ static long __restore_v_state(struct pt_regs *regs, = void __user *sc_vec) > return copy_from_user(current->thread.vstate.datap, datap, riscv_v_vsiz= e); > } > =20 > +static long save_cfiss_state(struct pt_regs *regs, void __user *sc_cfi) > +{ > + struct __sc_riscv_cfi_state __user *state =3D sc_cfi; > + unsigned long ss_ptr =3D 0; > + long err =3D 0; > + > + if (!IS_ENABLED(CONFIG_RISCV_USER_CFI) || !is_shstk_enabled(current)) !is_shstk_enabled() should be enough here. [The rest looks fine, but I'll need more time to think about it. I'll return to this patch in v13.]