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- // 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.
- struct arch_seccomp_data;
- namespace sandbox {
- // 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 arch_seccomp_data& args,
- void* aux);
- // The following seven handlers are suitable to report failures for specific
- // system calls with additional information.
- // 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 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 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 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 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 arch_seccomp_data& args,
- void* aux);
- // The crashing address will be (op & 0xFFF), where op is the second
- // argument.
- SANDBOX_EXPORT intptr_t SIGSYSPtraceFailure(const 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 arch_seccomp_data& args,
- void* aux);
- // If the fstatat() syscall is functionally equivalent to an fstat() syscall,
- // then rewrite the syscall to the equivalent fstat() syscall which can be
- // adequately sandboxed.
- // If the fstatat() is not functionally equivalent to an fstat() syscall, we
- // fail with -fs_denied_errno.
- // If the syscall is not an fstatat() at all, crash in the same way as
- // CrashSIGSYS_Handler.
- // This is necessary because glibc and musl have started rewriting fstat(fd,
- // stat_buf) as fstatat(fd, "", stat_buf, AT_EMPTY_PATH). We rewrite the latter
- // back to the former, which is actually sandboxable.
- SANDBOX_EXPORT intptr_t
- SIGSYSFstatatHandler(const struct arch_seccomp_data& args,
- void* fs_denied_errno);
- // 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 CrashSIGSYSPtrace();
- SANDBOX_EXPORT bpf_dsl::ResultExpr RewriteSchedSIGSYS();
- SANDBOX_EXPORT bpf_dsl::ResultExpr RewriteFstatatSIGSYS(int fs_denied_errno);
- // Allocates a crash key so that Seccomp information can be recorded.
- void AllocateCrashKeys();
- // 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();
- SANDBOX_EXPORT const char* GetPtraceErrorMessageContentForTests();
- } // namespace sandbox.
- #endif // SANDBOX_LINUX_SECCOMP_BPF_HELPERS_SIGSYS_HANDLERS_H_
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