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gh-158529: Prevent mimalloc calling system calls directly on Android #158530

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gh-158529: Prevent mimalloc calling system calls directly on Android #158530

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Prevent mimalloc calling system calls directly on Android
mhsmith Sep 30, 2026
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mhsmith Sep 30, 2026
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2026-09-30-21-29-54.gh-issue-158529.kZO7mX.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fixed crash on Android x86_64, API levels 27-28, caused by mimalloc calling
system calls directly.
5 changes: 4 additions & 1 deletion Objects/mimalloc/prim/unix/prim.c
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Expand Up @@ -60,9 +60,12 @@ terms of the MIT license. A copy of the license can be found in the file
// Use syscalls for some primitives to allow for libraries that override open/read/close etc.
// and do allocation themselves; using syscalls prevents recursion when mimalloc is
// still initializing (issue #713)
//
// This isn't done on Android because some versions have an excessively strict
// seccomp filter (https://github.com/android/ndk/issues/1298).
//------------------------------------------------------------------------------------

#if defined(MI_HAS_SYSCALL_H) && defined(SYS_open) && defined(SYS_close) && defined(SYS_read) && defined(SYS_access)
#if defined(MI_HAS_SYSCALL_H) && defined(SYS_open) && defined(SYS_close) && defined(SYS_read) && defined(SYS_access) && !defined(__ANDROID__)

static int mi_prim_open(const char* fpath, int open_flags) {
return syscall(SYS_open,fpath,open_flags,0);
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