1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef SANDBOX_LINUX_SECCOMP_BPF_HELPERS_SIGSYS_HANDLERS_H_ 6 #define SANDBOX_LINUX_SECCOMP_BPF_HELPERS_SIGSYS_HANDLERS_H_ 7 8 #include "base/basictypes.h" 9 #include "build/build_config.h" 10 #include "sandbox/linux/bpf_dsl/bpf_dsl.h" 11 #include "sandbox/sandbox_export.h" 12 13 // The handlers are suitable for use in Trap() error codes. They are 14 // guaranteed to be async-signal safe. 15 // See sandbox/linux/seccomp-bpf/trap.h to see how they work. 16 17 namespace sandbox { 18 19 struct arch_seccomp_data; 20 21 // This handler will crash the currently running process. The crashing address 22 // will be the number of the current system call, extracted from |args|. 23 // This handler will also print to stderr the number of the crashing syscall. 24 SANDBOX_EXPORT intptr_t 25 CrashSIGSYS_Handler(const struct arch_seccomp_data& args, void* aux); 26 27 // The following three handlers are suitable to report failures with the 28 // clone(), prctl() and ioctl() system calls respectively. 29 30 // The crashing address will be (clone_flags & 0xFFFFFF), where clone_flags is 31 // the clone(2) argument, extracted from |args|. 32 SANDBOX_EXPORT intptr_t 33 SIGSYSCloneFailure(const struct arch_seccomp_data& args, void* aux); 34 // The crashing address will be (option & 0xFFF), where option is the prctl(2) 35 // argument. 36 SANDBOX_EXPORT intptr_t 37 SIGSYSPrctlFailure(const struct arch_seccomp_data& args, void* aux); 38 // The crashing address will be request & 0xFFFF, where request is the ioctl(2) 39 // argument. 40 SANDBOX_EXPORT intptr_t 41 SIGSYSIoctlFailure(const struct arch_seccomp_data& args, void* aux); 42 // The crashing address will be (pid & 0xFFF), where pid is the first 43 // argument (and can be a tid). 44 SANDBOX_EXPORT intptr_t 45 SIGSYSKillFailure(const struct arch_seccomp_data& args, void* aux); 46 // The crashing address will be (op & 0xFFF), where op is the second 47 // argument. 48 SANDBOX_EXPORT intptr_t 49 SIGSYSFutexFailure(const struct arch_seccomp_data& args, void* aux); 50 // If the syscall is not being called on the current tid, crashes in the same 51 // way as CrashSIGSYS_Handler. Otherwise, returns the result of calling the 52 // syscall with the pid argument set to 0 (which for these calls means the 53 // current thread). The following syscalls are supported: 54 // 55 // sched_getaffinity(), sched_getattr(), sched_getparam(), sched_getscheduler(), 56 // sched_rr_get_interval(), sched_setaffinity(), sched_setattr(), 57 // sched_setparam(), sched_setscheduler() 58 SANDBOX_EXPORT intptr_t 59 SIGSYSSchedHandler(const struct arch_seccomp_data& args, void* aux); 60 61 // Variants of the above functions for use with bpf_dsl. 62 SANDBOX_EXPORT bpf_dsl::ResultExpr CrashSIGSYS(); 63 SANDBOX_EXPORT bpf_dsl::ResultExpr CrashSIGSYSClone(); 64 SANDBOX_EXPORT bpf_dsl::ResultExpr CrashSIGSYSPrctl(); 65 SANDBOX_EXPORT bpf_dsl::ResultExpr CrashSIGSYSIoctl(); 66 SANDBOX_EXPORT bpf_dsl::ResultExpr CrashSIGSYSKill(); 67 SANDBOX_EXPORT bpf_dsl::ResultExpr CrashSIGSYSFutex(); 68 SANDBOX_EXPORT bpf_dsl::ResultExpr RewriteSchedSIGSYS(); 69 70 // Following four functions return substrings of error messages used 71 // in the above four functions. They are useful in death tests. 72 SANDBOX_EXPORT const char* GetErrorMessageContentForTests(); 73 SANDBOX_EXPORT const char* GetCloneErrorMessageContentForTests(); 74 SANDBOX_EXPORT const char* GetPrctlErrorMessageContentForTests(); 75 SANDBOX_EXPORT const char* GetIoctlErrorMessageContentForTests(); 76 SANDBOX_EXPORT const char* GetKillErrorMessageContentForTests(); 77 SANDBOX_EXPORT const char* GetFutexErrorMessageContentForTests(); 78 79 } // namespace sandbox. 80 81 #endif // SANDBOX_LINUX_SECCOMP_BPF_HELPERS_SIGSYS_HANDLERS_H_ 82