| // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef SANDBOX_LINUX_SECCOMP_BPF_HELPERS_SIGSYS_HANDLERS_H_ |
| #define SANDBOX_LINUX_SECCOMP_BPF_HELPERS_SIGSYS_HANDLERS_H_ |
| |
| #include <stdint.h> |
| |
| #include "build/build_config.h" |
| #include "sandbox/linux/bpf_dsl/bpf_dsl_forward.h" |
| #include "sandbox/sandbox_export.h" |
| |
| // The handlers are suitable for use in Trap() error codes. They are |
| // guaranteed to be async-signal safe. |
| // See sandbox/linux/seccomp-bpf/trap.h to see how they work. |
| |
| namespace sandbox { |
| |
| struct arch_seccomp_data; |
| |
| // This handler will crash the currently running process. The crashing address |
| // will be the number of the current system call, extracted from |args|. |
| // This handler will also print to stderr the number of the crashing syscall. |
| SANDBOX_EXPORT intptr_t |
| CrashSIGSYS_Handler(const struct arch_seccomp_data& args, void* aux); |
| |
| // The following three handlers are suitable to report failures with the |
| // clone(), prctl() and ioctl() system calls respectively. |
| |
| // The crashing address will be (clone_flags & 0xFFFFFF), where clone_flags is |
| // the clone(2) argument, extracted from |args|. |
| SANDBOX_EXPORT intptr_t |
| SIGSYSCloneFailure(const struct arch_seccomp_data& args, void* aux); |
| // The crashing address will be (option & 0xFFF), where option is the prctl(2) |
| // argument. |
| SANDBOX_EXPORT intptr_t |
| SIGSYSPrctlFailure(const struct arch_seccomp_data& args, void* aux); |
| // The crashing address will be request & 0xFFFF, where request is the ioctl(2) |
| // argument. |
| SANDBOX_EXPORT intptr_t |
| SIGSYSIoctlFailure(const struct arch_seccomp_data& args, void* aux); |
| // The crashing address will be (pid & 0xFFF), where pid is the first |
| // argument (and can be a tid). |
| SANDBOX_EXPORT intptr_t |
| SIGSYSKillFailure(const struct arch_seccomp_data& args, void* aux); |
| // The crashing address will be (op & 0xFFF), where op is the second |
| // argument. |
| SANDBOX_EXPORT intptr_t |
| SIGSYSFutexFailure(const struct arch_seccomp_data& args, void* aux); |
| // If the syscall is not being called on the current tid, crashes in the same |
| // way as CrashSIGSYS_Handler. Otherwise, returns the result of calling the |
| // syscall with the pid argument set to 0 (which for these calls means the |
| // current thread). The following syscalls are supported: |
| // |
| // sched_getaffinity(), sched_getattr(), sched_getparam(), sched_getscheduler(), |
| // sched_rr_get_interval(), sched_setaffinity(), sched_setattr(), |
| // sched_setparam(), sched_setscheduler() |
| SANDBOX_EXPORT intptr_t |
| SIGSYSSchedHandler(const struct arch_seccomp_data& args, void* aux); |
| |
| // Variants of the above functions for use with bpf_dsl. |
| SANDBOX_EXPORT bpf_dsl::ResultExpr CrashSIGSYS(); |
| SANDBOX_EXPORT bpf_dsl::ResultExpr CrashSIGSYSClone(); |
| SANDBOX_EXPORT bpf_dsl::ResultExpr CrashSIGSYSPrctl(); |
| SANDBOX_EXPORT bpf_dsl::ResultExpr CrashSIGSYSIoctl(); |
| SANDBOX_EXPORT bpf_dsl::ResultExpr CrashSIGSYSKill(); |
| SANDBOX_EXPORT bpf_dsl::ResultExpr CrashSIGSYSFutex(); |
| SANDBOX_EXPORT bpf_dsl::ResultExpr RewriteSchedSIGSYS(); |
| |
| // Following four functions return substrings of error messages used |
| // in the above four functions. They are useful in death tests. |
| SANDBOX_EXPORT const char* GetErrorMessageContentForTests(); |
| SANDBOX_EXPORT const char* GetCloneErrorMessageContentForTests(); |
| SANDBOX_EXPORT const char* GetPrctlErrorMessageContentForTests(); |
| SANDBOX_EXPORT const char* GetIoctlErrorMessageContentForTests(); |
| SANDBOX_EXPORT const char* GetKillErrorMessageContentForTests(); |
| SANDBOX_EXPORT const char* GetFutexErrorMessageContentForTests(); |
| |
| } // namespace sandbox. |
| |
| #endif // SANDBOX_LINUX_SECCOMP_BPF_HELPERS_SIGSYS_HANDLERS_H_ |