30 lines
1.6 KiB
Diff
30 lines
1.6 KiB
Diff
diff -up chromium-73.0.3683.103/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc.glibc229 chromium-73.0.3683.103/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
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--- chromium-73.0.3683.103/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc.glibc229 2019-04-16 11:49:35.353081246 -0400
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+++ chromium-73.0.3683.103/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc 2019-04-16 11:51:22.105794620 -0400
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@@ -134,7 +134,8 @@ namespace sandbox {
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#if !defined(OS_NACL_NONSFI)
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// Allow Glibc's and Android pthread creation flags, crash on any other
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// thread creation attempts and EPERM attempts to use neither
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-// CLONE_VM, nor CLONE_THREAD, which includes all fork() implementations.
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+// CLONE_VM nor CLONE_THREAD (all fork implementations), unless CLONE_VFORK is
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+// present (as in posix_spawn).
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ResultExpr RestrictCloneToThreadsAndEPERMFork() {
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const Arg<unsigned long> flags(0);
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@@ -153,8 +154,14 @@ ResultExpr RestrictCloneToThreadsAndEPER
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AnyOf(flags == kAndroidCloneMask, flags == kObsoleteAndroidCloneMask,
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flags == kGlibcPthreadFlags);
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+ const uint64_t kImportantSpawnFlags = CLONE_VFORK | CLONE_VM;
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+
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+ const BoolExpr isForkOrSpawn =
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+ AnyOf((flags & (CLONE_VM | CLONE_THREAD)) == 0,
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+ (flags & kImportantSpawnFlags) == kImportantSpawnFlags);
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+
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return If(IsAndroid() ? android_test : glibc_test, Allow())
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- .ElseIf((flags & (CLONE_VM | CLONE_THREAD)) == 0, Error(EPERM))
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+ .ElseIf(isForkOrSpawn, Error(EPERM))
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.Else(CrashSIGSYSClone());
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}
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