124 lines
4.9 KiB
Diff
124 lines
4.9 KiB
Diff
musl uses different syscalls from glibc for some functions, so the sandbox has
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to account for that
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--
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diff --git a/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc ./sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
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index ff5a1c0..da56b9b 100644
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--- a/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
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+++ ./sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
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@@ -139,21 +139,11 @@ namespace sandbox {
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// present (as in newer versions of posix_spawn).
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ResultExpr RestrictCloneToThreadsAndEPERMFork() {
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const Arg<unsigned long> flags(0);
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-
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- // TODO(mdempsky): Extend DSL to support (flags & ~mask1) == mask2.
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- const uint64_t kAndroidCloneMask = CLONE_VM | CLONE_FS | CLONE_FILES |
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- CLONE_SIGHAND | CLONE_THREAD |
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- CLONE_SYSVSEM;
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- const uint64_t kObsoleteAndroidCloneMask = kAndroidCloneMask | CLONE_DETACHED;
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-
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- const uint64_t kGlibcPthreadFlags =
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- CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | CLONE_THREAD |
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- CLONE_SYSVSEM | CLONE_SETTLS | CLONE_PARENT_SETTID | CLONE_CHILD_CLEARTID;
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- const BoolExpr glibc_test = flags == kGlibcPthreadFlags;
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-
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- const BoolExpr android_test =
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- AnyOf(flags == kAndroidCloneMask, flags == kObsoleteAndroidCloneMask,
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- flags == kGlibcPthreadFlags);
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+ const int required = CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND |
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+ CLONE_THREAD | CLONE_SYSVSEM;
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+ const int safe = CLONE_SETTLS | CLONE_PARENT_SETTID | CLONE_CHILD_CLEARTID |
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+ CLONE_DETACHED;
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+ const BoolExpr thread_clone_ok = (flags&~safe)==required;
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// The following two flags are the two important flags in any vfork-emulating
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// clone call. EPERM any clone call that contains both of them.
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@@ -163,7 +153,7 @@ ResultExpr RestrictCloneToThreadsAndEPERMFork() {
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AnyOf((flags & (CLONE_VM | CLONE_THREAD)) == 0,
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(flags & kImportantCloneVforkFlags) == kImportantCloneVforkFlags);
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- return If(IsAndroid() ? android_test : glibc_test, Allow())
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+ return If(thread_clone_ok, Allow())
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.ElseIf(is_fork_or_clone_vfork, Error(EPERM))
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.Else(CrashSIGSYSClone());
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}
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diff --git a/sandbox/linux/seccomp-bpf-helpers/syscall_sets.cc ./sandbox/linux/seccomp-bpf-helpers/syscall_sets.cc
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index d9d1882..0567557 100644
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--- a/sandbox/linux/seccomp-bpf-helpers/syscall_sets.cc
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+++ ./sandbox/linux/seccomp-bpf-helpers/syscall_sets.cc
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@@ -438,6 +438,7 @@
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#if defined(__i386__)
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case __NR_waitpid:
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#endif
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+ case __NR_set_tid_address:
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return true;
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case __NR_clone: // Should be parameter-restricted.
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case __NR_setns: // Privileged.
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@@ -450,7 +451,6 @@
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#if defined(__i386__) || defined(__x86_64__) || defined(__mips__)
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case __NR_set_thread_area:
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#endif
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- case __NR_set_tid_address:
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case __NR_unshare:
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#if !defined(__mips__) && !defined(__aarch64__)
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case __NR_vfork:
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@@ -549,6 +549,8 @@
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case __NR_munlock:
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case __NR_munmap:
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case __NR_mseal:
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+ case __NR_mremap:
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+ case __NR_membarrier:
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return true;
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case __NR_madvise:
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case __NR_mincore:
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@@ -566,7 +568,6 @@
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case __NR_modify_ldt:
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#endif
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case __NR_mprotect:
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- case __NR_mremap:
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case __NR_msync:
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case __NR_munlockall:
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case __NR_readahead:
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diff --git a/sandbox/linux/system_headers/linux_syscalls.h ./sandbox/linux/system_headers/linux_syscalls.h
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index 2b78a0c..b6fedb5 100644
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--- a/sandbox/linux/system_headers/linux_syscalls.h
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+++ b/sandbox/linux/system_headers/linux_syscalls.h
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@@ -10,6 +10,7 @@
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#define SANDBOX_LINUX_SYSTEM_HEADERS_LINUX_SYSCALLS_H_
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#include "build/build_config.h"
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+#include <sys/syscall.h>
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#if defined(__x86_64__)
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#include "sandbox/linux/system_headers/x86_64_linux_syscalls.h"
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--- a/sandbox/policy/linux/bpf_renderer_policy_linux.cc
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+++ b/sandbox/policy/linux/bpf_renderer_policy_linux.cc
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@@ -94,6 +94,9 @@
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case __NR_pwrite64:
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case __NR_sched_get_priority_max:
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case __NR_sched_get_priority_min:
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+ case __NR_sched_getparam:
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+ case __NR_sched_getscheduler:
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+ case __NR_sched_setscheduler:
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case __NR_sysinfo:
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case __NR_times:
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case __NR_uname:
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--- a/sandbox/linux/seccomp-bpf-helpers/baseline_policy.cc
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+++ b/sandbox/linux/seccomp-bpf-helpers/baseline_policy.cc
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@@ -225,10 +225,15 @@
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if (sysno == __NR_getpriority || sysno ==__NR_setpriority)
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return RestrictGetSetpriority(current_pid);
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+ // XXX: hacks for musl sandbox, calls needed?
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+ if (sysno == __NR_sched_getparam || sysno == __NR_sched_getscheduler ||
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+ sysno == __NR_sched_setscheduler) {
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+ return Allow();
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+ }
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+
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// The scheduling syscalls are used in threading libraries and also heavily in
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// abseil. See for example https://crbug.com/1370394.
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- if (sysno == __NR_sched_getaffinity || sysno == __NR_sched_getparam ||
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- sysno == __NR_sched_getscheduler || sysno == __NR_sched_setscheduler) {
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+ if (sysno == __NR_sched_getaffinity) {
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return RestrictSchedTarget(current_pid, sysno);
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}
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