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Fri, 29 Aug 2025 22:48:12 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, Pierrick Bouvier Subject: [PATCH v4 77/84] linux-user/aarch64: Implement map_shadow_stack syscall Date: Sat, 30 Aug 2025 15:41:21 +1000 Message-ID: <20250830054128.448363-78-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250830054128.448363-1-richard.henderson@linaro.org> References: <20250830054128.448363-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::536; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x536.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1756572987682124100 Content-Type: text/plain; charset="utf-8" Reviewed-by: Pierrick Bouvier Signed-off-by: Richard Henderson --- linux-user/syscall.c | 59 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index dfe114ceb3..0a7ce7a262 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -6356,6 +6356,12 @@ abi_long do_arch_prctl(CPUX86State *env, int code, a= bi_ulong addr) # define PR_SET_SHADOW_STACK_STATUS 75 # define PR_LOCK_SHADOW_STACK_STATUS 76 #endif +#ifndef SHADOW_STACK_SET_TOKEN +# define SHADOW_STACK_SET_TOKEN (1u << 0) +#endif +#ifndef SHADOW_STACK_SET_MARKER +# define SHADOW_STACK_SET_MARKER (1u << 1) +#endif =20 #include "target_prctl.h" =20 @@ -6571,6 +6577,54 @@ static abi_long do_prctl(CPUArchState *env, abi_long= option, abi_long arg2, } } =20 +#ifdef TARGET_AARCH64 +static abi_long do_map_shadow_stack(CPUArchState *env, abi_ulong addr, + abi_ulong size, abi_int flags) +{ + ARMCPU *cpu =3D env_archcpu(env); + abi_ulong alloc_size; + + if (!cpu_isar_feature(aa64_gcs, cpu)) { + return -TARGET_EOPNOTSUPP; + } + if (flags & ~(SHADOW_STACK_SET_TOKEN | SHADOW_STACK_SET_MARKER)) { + return -TARGET_EINVAL; + } + if (addr & ~TARGET_PAGE_MASK) { + return -TARGET_EINVAL; + } + if (size =3D=3D 8 || !QEMU_IS_ALIGNED(size, 8)) { + return -TARGET_EINVAL; + } + + alloc_size =3D TARGET_PAGE_ALIGN(size); + if (alloc_size < size) { + return -TARGET_EOVERFLOW; + } + + mmap_lock(); + addr =3D gcs_alloc(addr, alloc_size); + if (addr !=3D -1) { + if (flags & SHADOW_STACK_SET_TOKEN) { + abi_ptr cap_ptr =3D addr + size - 8; + uint64_t cap_val; + + if (flags & SHADOW_STACK_SET_MARKER) { + /* Leave an extra empty frame at top-of-stack. */ + cap_ptr -=3D 8; + } + cap_val =3D (cap_ptr & TARGET_PAGE_MASK) | 1; + if (put_user_u64(cap_val, cap_ptr)) { + /* Allocation succeeded above. */ + g_assert_not_reached(); + } + } + } + mmap_unlock(); + return get_errno(addr); +} +#endif + #define NEW_STACK_SIZE 0x40000 =20 =20 @@ -13945,6 +13999,11 @@ static abi_long do_syscall1(CPUArchState *cpu_env,= int num, abi_long arg1, return do_riscv_hwprobe(cpu_env, arg1, arg2, arg3, arg4, arg5); #endif =20 +#ifdef TARGET_AARCH64 + case TARGET_NR_map_shadow_stack: + return do_map_shadow_stack(cpu_env, arg1, arg2, arg3); +#endif + default: qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num); return -TARGET_ENOSYS; --=20 2.43.0