Daily digest of glibc mailing-list proposals and landed commits.https://glibcdigest.dev/en-ushttps://glibcdigest.dev/glibc/discussions/2026-04-18-stdio-common-fix-buffer-overflow-in-scanf-mc-bz-34008-04f7f0.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-18-stdio-common-fix-buffer-overflow-in-scanf-mc-bz-34008-04f7f0.mdThis patch fixes a one-byte buffer overflow in glibc's scanf when using the %mc format specifier.Sat, 18 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-add-hunsrickisch-locale-for-brazil-hrx_br-26ead8.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-add-hunsrickisch-locale-for-brazil-hrx_br-26ead8.mdThe Hunsrickisch locale for Brazil (hrx_BR) has been added to glibc.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-add-hunsrik-locale-support-hrx-hrx_br-092a0b.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-add-hunsrik-locale-support-hrx-hrx_br-092a0b.mdThis patch adds support for the Hunsrik locale (hrx) and the Hunsrik locale for Brazil (hrx_BR) to glibc.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-add-regression-test-for-scanf-mc-buffer-overflow-b80d32.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-add-regression-test-for-scanf-mc-buffer-overflow-b80d32.mdThis patch adds a regression test for a buffer overflow vulnerability in scanf's %mc format specifier.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-add-system-wide-tunables-3419d0.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-add-system-wide-tunables-3419d0.mdThis series introduces system-wide tunables configurable via /etc/tunables.conf, allowing administrators to adjust glibc behavior per-process.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-advisories-update-glibc-sa-2026-0007-4e98ab.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-advisories-update-glibc-sa-2026-0007-4e98ab.mdUpdate NEWS and the advisory for GLIBC-SA-2026-0007 to describe an iconv crash.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-add-test-for-thp-alignment-of-large-load-segments-3808a9.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-add-test-for-thp-alignment-of-large-load-segments-3808a9.mdThis patch adds a test to verify that large executable PT_LOAD segments are THP-aligned when glibc.elf.thp=1 and THP is in 'always' mode.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-automatic-thp-in-malloc-breaks-madvise-for-container-hosts-7239a6.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-automatic-thp-in-malloc-breaks-madvise-for-container-hosts-7239a6.mdGlibc's automatic THP opt-in via madvise hurts container hosts by allocating huge pages to small management processes instead of actual workloads.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-consolidate-and-sync-fts-ftw-5c9e81.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-consolidate-and-sync-fts-ftw-5c9e81.mdThis series consolidates the fts/ftw implementation and syncs fts with gnulib, including fixes for FTS_NOSTAT.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-check-if-linker-supports-z-separate-code-975daa.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-check-if-linker-supports-z-separate-code-975daa.mdThis patch checks if the linker supports the -z separate-code option.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-elf-thp-aware-load-segment-alignment-95dcc7.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-elf-thp-aware-load-segment-alignment-95dcc7.mdThis patch series enables THP-aware load segment alignment in glibc, reducing iTLB misses and improving performance with madvise THP.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-define-hunsrik-hrx-in-iso-639-def-95f834.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-define-hunsrik-hrx-in-iso-639-def-95f834.mdThe Hunsrik language code (hrx) has been added to the iso-639.def file in glibc.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-fix-buffer-overflow-in-scanf-mc-509f4b.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-fix-buffer-overflow-in-scanf-mc-509f4b.mdThis patch fixes a buffer overflow vulnerability in scanf's %mc format specifier, identified as CVE-2026-5450.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-fossy-2026-to-host-toolchain-track-in-north-america-c67baa.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-fossy-2026-to-host-toolchain-track-in-north-america-c67baa.mdFOSSY 2026 will include a toolchain track for developers of GCC, binutils, GDB, glibc, and other core tools; submit talk proposals by June 1st.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-ftw-nftw-add-missing-free-calls-d31f23.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-ftw-nftw-add-missing-free-calls-d31f23.mdReviewers note that the proposed patch to fix silent readdir failures in ftw/nftw needs `free()` calls and has typos.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-ga_ie-add-missing-dco-header-36a323.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-ga_ie-add-missing-dco-header-36a323.mdAdds the DCO copyright header to the ga_IE locale file.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-glibc-update-contribution-guidelines-to-mention-tool-usage-and-assisted-by-038abc.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-glibc-update-contribution-guidelines-to-mention-tool-usage-and-assisted-by-038abc.mdProposes updating glibc's contribution guidelines to require mentioning tools used for code generation and to allow `Assisted-by` trailers.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-io-consolidate-fts-implementation-24050f.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-io-consolidate-fts-implementation-24050f.mdThis patch consolidates the fts implementation by removing wordsize-64 and arch-specific implementations where off_t matches off64_t.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-io-consolidate-ftw-implementation-0dcffe.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-io-consolidate-ftw-implementation-0dcffe.mdThis patch consolidates the ftw implementation by removing wordsize-64 and arch-specific implementations where off_t matches off64_t.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-io-sync-fts-with-gnulib-fb60ad.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-io-sync-fts-with-gnulib-fb60ad.mdThe patch syncs the fts implementation with gnulib, including fixes and documentation for FTS_NOSTAT.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-libio-seeking-feedback-on-fmemopen_write-fix-cd52e6.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-libio-seeking-feedback-on-fmemopen_write-fix-cd52e6.mdRocket Ma is pinging for feedback on a patch to fix `fmemopen_write` in appending condition.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-io-use-gnulib-fts-implementation-bz-22944-bz-20331-40a114.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-io-use-gnulib-fts-implementation-bz-22944-bz-20331-40a114.mdUpstream suggests closing a bug report as WONTFIX, regarding programs relying on FTS_NOSTAT to stat files, which has always been broken.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-malloc-introduce-ifuncs-for-malloc-functions-202490.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-malloc-introduce-ifuncs-for-malloc-functions-202490.mdA patch introduces ifuncs for malloc functions, renaming core implementations with a `_core` suffix. Discussion questions the suffix choice.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-libio-split-patch-fixing-_io_wdefault_pbackfail-and-_io_wdefault_finish-4399d5.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-libio-split-patch-fixing-_io_wdefault_pbackfail-and-_io_wdefault_finish-4399d5.mdThe patch fixing stream pointer dereferencing in libio should be split and include a copyright header and test description.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-misc-fix-lint-makefiles-failures-84f12f.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-misc-fix-lint-makefiles-failures-84f12f.mdA patch fixes lint-makefiles failures by reordering entries and changing an assignment operator. One change is questioned.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-localedata-correct-spacing-in-hrx_br-locale-742187.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-localedata-correct-spacing-in-hrx_br-locale-742187.mdFixes inconsistent spacing in the hrx_BR locale file by ensuring there's one space after 'category'.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-s390-move-files-out-of-s390-64-folders-b9262b.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-s390-move-files-out-of-s390-64-folders-b9262b.mdThis patch moves files from the s390/s390-64 subdirectory to s390/, merging them when necessary.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-propose-fine-grained-thp-control-via-gnu-properties-6bcd95.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-propose-fine-grained-thp-control-via-gnu-properties-6bcd95.mdAdds GNU properties to allow per-application control of Transparent Huge Pages (THP) on read-only segments and in malloc.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-optimize-memcmp-for-kunpeng-950-with-sve-640f71.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-optimize-memcmp-for-kunpeng-950-with-sve-640f71.mdThis patch optimizes memcmp for the Kunpeng 950 using SVE, resulting in 15% - 50% speedups for small to large inputs.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-sframe-add-sframe-v3-decode-support-for-regular-fdes-758c56.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-sframe-add-sframe-v3-decode-support-for-regular-fdes-758c56.mdThis patch adds support for decoding SFrame v3 format, which includes changes to function descriptor layouts and stack trace backtracing.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-support-thp-segment-load-with-madvise-enabled-thp-3a4ae5.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-support-thp-segment-load-with-madvise-enabled-thp-3a4ae5.mdThis patch enables THP segment loading when THP is enabled with madvise in the kernel.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-04-17-stdio-common-fix-buffer-overflow-in-scanf-mc-bz-34008-37690e.mdhttps://glibcdigest.dev/glibc/discussions/2026-04-17-stdio-common-fix-buffer-overflow-in-scanf-mc-bz-34008-37690e.mdThe scanf %mc format specifier had a buffer overflow; upstream requests that the fix and its regression test be combined into a single commit.Fri, 17 Apr 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2026-02-11-add-system-wide-tunables-filters-df29ed.mdhttps://glibcdigest.dev/glibc/discussions/2026-02-11-add-system-wide-tunables-filters-df29ed.mdAdds filters to system-wide tunables based on process name and security status (AT_SECURE), limiting tunable application to matching processes.Wed, 11 Feb 2026 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2024-02-21-add-system-wide-tunables-apply-tunables-part-68e24f.mdhttps://glibcdigest.dev/glibc/discussions/2024-02-21-add-system-wide-tunables-apply-tunables-part-68e24f.mdLoads ld.so.cache, fetches the tunables extension, and applies those tunables to the current program, deferring security policy enforcement.Wed, 21 Feb 2024 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2024-02-21-add-system-wide-tunables-cache-ld-so-cache-7bc624.mdhttps://glibcdigest.dev/glibc/discussions/2024-02-21-add-system-wide-tunables-cache-ld-so-cache-7bc624.mdCaches ld.so.cache in memory, re-reading only on changes, enabling more intensive security checks and handling cache corruption.Wed, 21 Feb 2024 00:00:00 GMThttps://glibcdigest.dev/glibc/discussions/2023-12-05-add-system-wide-tunables-ldconfig-part-426e12.mdhttps://glibcdigest.dev/glibc/discussions/2023-12-05-add-system-wide-tunables-ldconfig-part-426e12.mdThis patch adds support for system-wide GLIBC tunables via /etc/tunables.conf, controlling overridability with prefixes like !, +, and -.Tue, 05 Dec 2023 00:00:00 GMT