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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::102f; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x102f.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: 2.1.23 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" X-ZohoMail-DKIM: pass (identity @linaro.org) Content-Type: text/plain; charset="utf-8" Create a function to match target_save_altstack. Fix some style and unlock issues in do_sigaltstack. Signed-off-by: Richard Henderson --- linux-user/signal-common.h | 1 + linux-user/signal.c | 115 +++++++++++++++++++++---------------- 2 files changed, 66 insertions(+), 50 deletions(-) diff --git a/linux-user/signal-common.h b/linux-user/signal-common.h index 1df1068552..34b963af9a 100644 --- a/linux-user/signal-common.h +++ b/linux-user/signal-common.h @@ -24,6 +24,7 @@ int on_sig_stack(unsigned long sp); int sas_ss_flags(unsigned long sp); abi_ulong target_sigsp(abi_ulong sp, struct target_sigaction *ka); void target_save_altstack(target_stack_t *uss, CPUArchState *env); +abi_long target_restore_altstack(target_stack_t *uss, abi_ulong sp); =20 static inline void target_sigemptyset(target_sigset_t *set) { diff --git a/linux-user/signal.c b/linux-user/signal.c index 44a5012930..306f3edec5 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -297,6 +297,50 @@ void target_save_altstack(target_stack_t *uss, CPUArch= State *env) __put_user(ts->sigaltstack_used.ss_size, &uss->ss_size); } =20 +abi_long target_restore_altstack(target_stack_t *uss, abi_ulong sp) +{ + TaskState *ts =3D (TaskState *)thread_cpu->opaque; + size_t minstacksize =3D TARGET_MINSIGSTKSZ; + target_stack_t ss; + +#if defined(TARGET_PPC64) + /* ELF V2 for PPC64 has a 4K minimum stack size for signal handlers */ + struct image_info *image =3D ts->info; + if (get_ppc64_abi(image) > 1) { + minstacksize =3D 4096; + } +#endif + + __get_user(ss.ss_sp, &uss->ss_sp); + __get_user(ss.ss_size, &uss->ss_size); + __get_user(ss.ss_flags, &uss->ss_flags); + + if (on_sig_stack(sp)) { + return -TARGET_EPERM; + } + + switch (ss.ss_flags) { + default: + return -TARGET_EINVAL; + + case TARGET_SS_DISABLE: + ss.ss_size =3D 0; + ss.ss_sp =3D 0; + break; + + case TARGET_SS_ONSTACK: + case 0: + if (ss.ss_size < minstacksize) { + return -TARGET_ENOMEM; + } + break; + } + + ts->sigaltstack_used.ss_sp =3D ss.ss_sp; + ts->sigaltstack_used.ss_size =3D ss.ss_size; + return 0; +} + /* siginfo conversion */ =20 static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo, @@ -758,73 +802,44 @@ static void host_signal_handler(int host_signum, sigi= nfo_t *info, /* compare linux/kernel/signal.c:do_sigaltstack() */ abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong= sp) { - int ret; - struct target_sigaltstack oss; - TaskState *ts =3D (TaskState *)thread_cpu->opaque; + target_stack_t oss, *uoss =3D NULL; + abi_long ret =3D -TARGET_EFAULT; =20 - /* XXX: test errors */ - if(uoss_addr) - { + if (uoss_addr) { + TaskState *ts =3D (TaskState *)thread_cpu->opaque; + + /* Verify writability now, but do not alter user memory yet. */ + if (!lock_user_struct(VERIFY_WRITE, uoss, uoss_addr, 0)) { + goto out; + } __put_user(ts->sigaltstack_used.ss_sp, &oss.ss_sp); __put_user(ts->sigaltstack_used.ss_size, &oss.ss_size); __put_user(sas_ss_flags(sp), &oss.ss_flags); } =20 - if(uss_addr) - { - struct target_sigaltstack *uss; - struct target_sigaltstack ss; - size_t minstacksize =3D TARGET_MINSIGSTKSZ; + if (uss_addr) { + target_stack_t *uss; =20 -#if defined(TARGET_PPC64) - /* ELF V2 for PPC64 has a 4K minimum stack size for signal handler= s */ - struct image_info *image =3D ((TaskState *)thread_cpu->opaque)->in= fo; - if (get_ppc64_abi(image) > 1) { - minstacksize =3D 4096; - } -#endif - - ret =3D -TARGET_EFAULT; if (!lock_user_struct(VERIFY_READ, uss, uss_addr, 1)) { goto out; } - __get_user(ss.ss_sp, &uss->ss_sp); - __get_user(ss.ss_size, &uss->ss_size); - __get_user(ss.ss_flags, &uss->ss_flags); - unlock_user_struct(uss, uss_addr, 0); - - ret =3D -TARGET_EPERM; - if (on_sig_stack(sp)) + ret =3D target_restore_altstack(uss, sp); + if (ret) { goto out; - - ret =3D -TARGET_EINVAL; - if (ss.ss_flags !=3D TARGET_SS_DISABLE - && ss.ss_flags !=3D TARGET_SS_ONSTACK - && ss.ss_flags !=3D 0) - goto out; - - if (ss.ss_flags =3D=3D TARGET_SS_DISABLE) { - ss.ss_size =3D 0; - ss.ss_sp =3D 0; - } else { - ret =3D -TARGET_ENOMEM; - if (ss.ss_size < minstacksize) { - goto out; - } } - - ts->sigaltstack_used.ss_sp =3D ss.ss_sp; - ts->sigaltstack_used.ss_size =3D ss.ss_size; } =20 if (uoss_addr) { - ret =3D -TARGET_EFAULT; - if (copy_to_user(uoss_addr, &oss, sizeof(oss))) - goto out; + memcpy(uoss, &oss, sizeof(oss)); + unlock_user_struct(uoss, uoss_addr, 1); + uoss =3D NULL; } - ret =3D 0; -out: + + out: + if (uoss) { + unlock_user_struct(uoss, uoss_addr, 0); + } return ret; } =20 --=20 2.25.1