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-rw-r--r--community/chromium/musl-tid-caching.patch85
1 files changed, 85 insertions, 0 deletions
diff --git a/community/chromium/musl-tid-caching.patch b/community/chromium/musl-tid-caching.patch
new file mode 100644
index 00000000000..498ce827317
--- /dev/null
+++ b/community/chromium/musl-tid-caching.patch
@@ -0,0 +1,85 @@
+the sandbox caching of thread id's only works with glibc
+see: https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/32356
+see: https://gitlab.alpinelinux.org/alpine/aports/-/issues/13579
+--
+--- a/sandbox/linux/services/namespace_sandbox.cc
++++ b/sandbox/linux/services/namespace_sandbox.cc
+@@ -209,6 +209,70 @@
+ return base::LaunchProcess(argv, launch_options_copy);
+ }
+
++#if defined(__aarch64__)
++#define TLS_ABOVE_TP
++#endif
++
++struct musl_pthread
++{
++ /* Part 1 -- these fields may be external or
++ * internal (accessed via asm) ABI. Do not change. */
++ struct pthread *self;
++#ifndef TLS_ABOVE_TP
++ uintptr_t *dtv;
++#endif
++ struct pthread *prev, *next; /* non-ABI */
++ uintptr_t sysinfo;
++#ifndef TLS_ABOVE_TP
++#ifdef CANARY_PAD
++ uintptr_t canary_pad;
++#endif
++ uintptr_t canary;
++#endif
++
++/* Part 2 -- implementation details, non-ABI. */
++ int tid;
++ int errno_val;
++ volatile int detach_state;
++ volatile int cancel;
++ volatile unsigned char canceldisable, cancelasync;
++ unsigned char tsd_used:1;
++ unsigned char dlerror_flag:1;
++ unsigned char *map_base;
++ size_t map_size;
++ void *stack;
++ size_t stack_size;
++ size_t guard_size;
++ void *result;
++ struct __ptcb *cancelbuf;
++ void **tsd;
++ struct {
++ volatile void *volatile head;
++ long off;
++ volatile void *volatile pending;
++ } robust_list;
++ int h_errno_val;
++ volatile int timer_id;
++ locale_t locale;
++ volatile int killlock[1];
++ char *dlerror_buf;
++ void *stdio_locks;
++
++ /* Part 3 -- the positions of these fields relative to
++ * the end of the structure is external and internal ABI. */
++#ifdef TLS_ABOVE_TP
++ uintptr_t canary;
++ uintptr_t *dtv;
++#endif
++};
++
++void MaybeUpdateMuslTidCache()
++{
++ pid_t real_tid = sys_gettid();
++ pid_t* cached_tid_location = &reinterpret_cast<struct musl_pthread*>(pthread_self())->tid;
++ *cached_tid_location = real_tid;
++}
++
+ // static
+ pid_t NamespaceSandbox::ForkInNewPidNamespace(bool drop_capabilities_in_child) {
+ const pid_t pid =
+@@ -226,6 +290,7 @@
+ #if defined(LIBC_GLIBC)
+ MaybeUpdateGlibcTidCache();
+ #endif
++ MaybeUpdateMuslTidCache();
+ return 0;
+ }
+