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diff -ru firefox-78.3.0/security/sandbox/linux/SandboxFilter.cpp firefox-78.4.0/security/sandbox/linux/SandboxFilter.cpp
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--- firefox-78.3.0/security/sandbox/linux/SandboxFilter.cpp 2020-09-14 21:21:02.000000000 +0200
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+++ firefox-78.4.0/security/sandbox/linux/SandboxFilter.cpp 2020-10-14 11:34:48.000000000 +0200
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@@ -243,14 +243,21 @@
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auto path = reinterpret_cast<const char*>(aArgs.args[1]);
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auto buf = reinterpret_cast<statstruct*>(aArgs.args[2]);
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auto flags = static_cast<int>(aArgs.args[3]);
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+
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+ if (fd != AT_FDCWD && (flags & AT_EMPTY_PATH) != 0 &&
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+ strcmp(path, "") == 0) {
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+ return ConvertError(fstatsyscall(fd, buf));
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+ }
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+
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if (fd != AT_FDCWD && path[0] != '/') {
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SANDBOX_LOG_ERROR("unsupported fd-relative fstatat(%d, \"%s\", %p, %d)",
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fd, path, buf, flags);
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return BlockedSyscallTrap(aArgs, nullptr);
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}
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- if ((flags & ~AT_SYMLINK_NOFOLLOW) != 0) {
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+ if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT)) != 0) {
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SANDBOX_LOG_ERROR("unsupported flags %d in fstatat(%d, \"%s\", %p, %d)",
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- (flags & ~AT_SYMLINK_NOFOLLOW), fd, path, buf, flags);
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+ (flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT)), fd,
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+ path, buf, flags);
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return BlockedSyscallTrap(aArgs, nullptr);
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}
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return (flags & AT_SYMLINK_NOFOLLOW) == 0 ? broker->Stat(path, buf)
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