87 lines
2.2 KiB
Diff
87 lines
2.2 KiB
Diff
Source: https://git.alpinelinux.org/aports/plain/community/chromium/musl-tid-caching.patch
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the sandbox caching of thread id's only works with glibc
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see: https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/32356
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see: https://gitlab.alpinelinux.org/alpine/aports/-/issues/13579
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--
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--- a/sandbox/linux/services/namespace_sandbox.cc
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+++ b/sandbox/linux/services/namespace_sandbox.cc
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@@ -209,6 +209,70 @@
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return base::LaunchProcess(argv, launch_options_copy);
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}
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+#if defined(__aarch64__) || defined(__arm__) || defined(__powerpc__)
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+#define TLS_ABOVE_TP
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+#endif
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+
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+struct musl_pthread
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+{
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+ /* Part 1 -- these fields may be external or
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+ * internal (accessed via asm) ABI. Do not change. */
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+ struct pthread *self;
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+#ifndef TLS_ABOVE_TP
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+ uintptr_t *dtv;
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+#endif
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+ struct pthread *prev, *next; /* non-ABI */
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+ uintptr_t sysinfo;
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+#ifndef TLS_ABOVE_TP
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+#ifdef CANARY_PAD
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+ uintptr_t canary_pad;
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+#endif
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+ uintptr_t canary;
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+#endif
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+
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+/* Part 2 -- implementation details, non-ABI. */
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+ int tid;
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+ int errno_val;
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+ volatile int detach_state;
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+ volatile int cancel;
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+ volatile unsigned char canceldisable, cancelasync;
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+ unsigned char tsd_used:1;
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+ unsigned char dlerror_flag:1;
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+ unsigned char *map_base;
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+ size_t map_size;
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+ void *stack;
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+ size_t stack_size;
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+ size_t guard_size;
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+ void *result;
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+ struct __ptcb *cancelbuf;
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+ void **tsd;
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+ struct {
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+ volatile void *volatile head;
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+ long off;
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+ volatile void *volatile pending;
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+ } robust_list;
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+ int h_errno_val;
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+ volatile int timer_id;
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+ locale_t locale;
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+ volatile int killlock[1];
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+ char *dlerror_buf;
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+ void *stdio_locks;
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+
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+ /* Part 3 -- the positions of these fields relative to
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+ * the end of the structure is external and internal ABI. */
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+#ifdef TLS_ABOVE_TP
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+ uintptr_t canary;
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+ uintptr_t *dtv;
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+#endif
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+};
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+
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+void MaybeUpdateMuslTidCache()
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+{
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+ pid_t real_tid = sys_gettid();
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+ pid_t* cached_tid_location = &reinterpret_cast<struct musl_pthread*>(pthread_self())->tid;
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+ *cached_tid_location = real_tid;
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+}
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+
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// static
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pid_t NamespaceSandbox::ForkInNewPidNamespace(bool drop_capabilities_in_child) {
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const pid_t pid =
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@@ -226,6 +290,7 @@
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#if defined(LIBC_GLIBC)
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MaybeUpdateGlibcTidCache();
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#endif
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+ MaybeUpdateMuslTidCache();
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return 0;
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}
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