From b11616073264bba0d45f6a61eac17886f6aa0583 Mon Sep 17 00:00:00 2001 From: Khem Raj Date: Fri, 19 Mar 2021 20:16:00 -0700 Subject: [PATCH 3/3] Fix tab crashes on musl Upstream-Status: Inappropriate [musl-specific] Signed-off-by: Khem Raj --- .../syscall_parameters_restrictions.cc | 22 +++++-------------- .../linux/seccomp-bpf-helpers/syscall_sets.cc | 5 +++-- .../system_headers/arm64_linux_syscalls.h | 4 ++++ .../linux/system_headers/arm_linux_syscalls.h | 4 ++++ sandbox/linux/system_headers/linux_syscalls.h | 1 + .../system_headers/mips64_linux_syscalls.h | 4 ++++ .../system_headers/mips_linux_syscalls.h | 4 ++++ .../system_headers/x86_64_linux_syscalls.h | 4 ++++ .../policy/linux/bpf_renderer_policy_linux.cc | 4 ++-- 9 files changed, 32 insertions(+), 20 deletions(-) --- a/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc +++ b/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc @@ -138,21 +138,11 @@ namespace sandbox { // present (as in newer versions of posix_spawn). ResultExpr RestrictCloneToThreadsAndEPERMFork() { const Arg flags(0); - - // TODO(mdempsky): Extend DSL to support (flags & ~mask1) == mask2. - const uint64_t kAndroidCloneMask = CLONE_VM | CLONE_FS | CLONE_FILES | - CLONE_SIGHAND | CLONE_THREAD | - CLONE_SYSVSEM; - const uint64_t kObsoleteAndroidCloneMask = kAndroidCloneMask | CLONE_DETACHED; - - const uint64_t kGlibcPthreadFlags = - CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | CLONE_THREAD | - CLONE_SYSVSEM | CLONE_SETTLS | CLONE_PARENT_SETTID | CLONE_CHILD_CLEARTID; - const BoolExpr glibc_test = flags == kGlibcPthreadFlags; - - const BoolExpr android_test = - AnyOf(flags == kAndroidCloneMask, flags == kObsoleteAndroidCloneMask, - flags == kGlibcPthreadFlags); + const int required = CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | + CLONE_THREAD | CLONE_SYSVSEM; + const int safe = CLONE_SETTLS | CLONE_PARENT_SETTID | CLONE_CHILD_CLEARTID | + CLONE_DETACHED; + const BoolExpr thread_clone_ok = (flags&~safe)==required; // The following two flags are the two important flags in any vfork-emulating // clone call. EPERM any clone call that contains both of them. @@ -162,7 +152,7 @@ ResultExpr RestrictCloneToThreadsAndEPER AnyOf((flags & (CLONE_VM | CLONE_THREAD)) == 0, (flags & kImportantCloneVforkFlags) == kImportantCloneVforkFlags); - return If(IsAndroid() ? android_test : glibc_test, Allow()) + return If(thread_clone_ok, Allow()) .ElseIf(is_fork_or_clone_vfork, Error(EPERM)) .Else(CrashSIGSYSClone()); } --- a/sandbox/linux/seccomp-bpf-helpers/syscall_sets.cc +++ b/sandbox/linux/seccomp-bpf-helpers/syscall_sets.cc @@ -418,6 +418,7 @@ bool SyscallSets::IsAllowedProcessStartO #if defined(__i386__) case __NR_waitpid: #endif + case __NR_set_tid_address: return true; case __NR_clone: // Should be parameter-restricted. case __NR_setns: // Privileged. @@ -430,7 +431,6 @@ bool SyscallSets::IsAllowedProcessStartO #if defined(__i386__) || defined(__x86_64__) || defined(__mips__) case __NR_set_thread_area: #endif - case __NR_set_tid_address: case __NR_unshare: #if !defined(__mips__) && !defined(__aarch64__) case __NR_vfork: @@ -544,6 +544,8 @@ bool SyscallSets::IsAllowedAddressSpaceA case __NR_mlock: case __NR_munlock: case __NR_munmap: + case __NR_mremap: + case __NR_membarrier: return true; case __NR_madvise: case __NR_mincore: @@ -561,7 +563,6 @@ bool SyscallSets::IsAllowedAddressSpaceA case __NR_modify_ldt: #endif case __NR_mprotect: - case __NR_mremap: case __NR_msync: case __NR_munlockall: case __NR_readahead: --- a/sandbox/linux/system_headers/arm64_linux_syscalls.h +++ b/sandbox/linux/system_headers/arm64_linux_syscalls.h @@ -1215,4 +1215,8 @@ #define __NR_landlock_restrict_self 446 #endif +#if !defined(__NR_membarrier) +#define __NR_membarrier 283 +#endif + #endif // SANDBOX_LINUX_SYSTEM_HEADERS_ARM64_LINUX_SYSCALLS_H_ --- a/sandbox/linux/system_headers/arm_linux_syscalls.h +++ b/sandbox/linux/system_headers/arm_linux_syscalls.h @@ -1617,6 +1617,10 @@ #define __NR_landlock_restrict_self (__NR_SYSCALL_BASE + 446) #endif +#if !defined(__NR_membarrier) +#define __NR_membarrier (__NR_SYSCALL_BASE+389) +#endif + // ARM private syscalls. #if !defined(__ARM_NR_BASE) #define __ARM_NR_BASE (__NR_SYSCALL_BASE + 0xF0000) --- a/sandbox/linux/system_headers/linux_syscalls.h +++ b/sandbox/linux/system_headers/linux_syscalls.h @@ -10,6 +10,7 @@ #define SANDBOX_LINUX_SYSTEM_HEADERS_LINUX_SYSCALLS_H_ #include "build/build_config.h" +#include #if defined(__x86_64__) #include "sandbox/linux/system_headers/x86_64_linux_syscalls.h" --- a/sandbox/linux/system_headers/mips64_linux_syscalls.h +++ b/sandbox/linux/system_headers/mips64_linux_syscalls.h @@ -1415,4 +1415,8 @@ #define __NR_landlock_restrict_self (__NR_Linux + 446) #endif +#if !defined(__NR_membarrier) +#define __NR_membarrier (__NR_Linux 318) +#endif + #endif // SANDBOX_LINUX_SYSTEM_HEADERS_MIPS64_LINUX_SYSCALLS_H_ --- a/sandbox/linux/system_headers/mips_linux_syscalls.h +++ b/sandbox/linux/system_headers/mips_linux_syscalls.h @@ -1697,4 +1697,8 @@ #define __NR_landlock_restrict_self (__NR_Linux + 446) #endif +#if !defined(__NR_membarrier) +#define __NR_membarrier (__NR_Linux 358) +#endif + #endif // SANDBOX_LINUX_SYSTEM_HEADERS_MIPS_LINUX_SYSCALLS_H_ --- a/sandbox/linux/system_headers/x86_64_linux_syscalls.h +++ b/sandbox/linux/system_headers/x86_64_linux_syscalls.h @@ -1438,5 +1438,9 @@ #define __NR_landlock_restrict_self 446 #endif +#if !defined(__NR_membarrier) +#define __NR_membarrier 324 +#endif + #endif // SANDBOX_LINUX_SYSTEM_HEADERS_X86_64_LINUX_SYSCALLS_H_ --- a/sandbox/policy/linux/bpf_renderer_policy_linux.cc +++ b/sandbox/policy/linux/bpf_renderer_policy_linux.cc @@ -97,11 +97,11 @@ ResultExpr RendererProcessPolicy::Evalua case __NR_sysinfo: case __NR_times: case __NR_uname: - return Allow(); - case __NR_sched_getaffinity: case __NR_sched_getparam: case __NR_sched_getscheduler: case __NR_sched_setscheduler: + return Allow(); + case __NR_sched_getaffinity: return RestrictSchedTarget(GetPolicyPid(), sysno); case __NR_prlimit64: // See crbug.com/662450 and setrlimit comment above.