gh-154258: Fix mmap.resize() crash on NetBSD growing a shared anonymous mapping#154259
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serhiy-storchaka merged 1 commit intoJul 20, 2026
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…nonymous mapping NetBSD mremap() returns a mapping whose grown region is not backed when growing a shared anonymous mapping, so accessing it crashes. Reject it with ValueError, as is already done on Linux. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14, 3.15. |
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GH-154262 is a backport of this pull request to the 3.15 branch. |
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GH-154263 is a backport of this pull request to the 3.14 branch. |
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GH-154264 is a backport of this pull request to the 3.13 branch. |
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…anonymous mapping (GH-154259) (GH-154264) NetBSD mremap() returns a mapping whose grown region is not backed when growing a shared anonymous mapping, so accessing it crashes. Reject it with ValueError, as is already done on Linux. (cherry picked from commit 542b982) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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…anonymous mapping (GH-154259) (GH-154263) NetBSD mremap() returns a mapping whose grown region is not backed when growing a shared anonymous mapping, so accessing it crashes. Reject it with ValueError, as is already done on Linux. (cherry picked from commit 542b982) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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…anonymous mapping (GH-154259) (GH-154262) NetBSD mremap() returns a mapping whose grown region is not backed when growing a shared anonymous mapping, so accessing it crashes. Reject it with ValueError, as is already done on Linux. (cherry picked from commit 542b982) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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On NetBSD,
mmap.resize()crashed (SIGSEGV) when growing a shared anonymous mapping, because NetBSDmremap()returns a mapping whose grown region is not backed (same behaviour as the Linux kernel bug the code already guards against, https://bugzilla.kernel.org/show_bug.cgi?id=8691). Reject it withValueError, as is already done on Linux.Verified on NetBSD 10 (crash gone,
resize()now raisesValueError,test_mmappasses) and on Linux and FreeBSD (unaffected).🤖 Generated with Claude Code