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Android and other projects like sanitizers uses this feature to improve debugability and a way to user understand better what kind of memory runtime allocates. The patchset adds annotations for the pthread stack, on both glibc created and user-provided, on loader minimal malloc and on malloc arenas and default allocation. For instance, on x86_64 the resulting mapping of the newly tst-decorate-maps shows: 5649d25bd000-5649d25bf000 r--p 00000000 103:05 40141614 /elf/tst-decorate-maps 5649d25bf000-5649d25c3000 r-xp 00002000 103:05 40141614 /elf/tst-decorate-maps 5649d25c3000-5649d25c5000 r--p 00006000 103:05 40141614 /elf/tst-decorate-maps 5649d25c5000-5649d25c6000 r--p 00007000 103:05 40141614 /elf/tst-decorate-maps 5649d25c6000-5649d25c7000 rw-p 00008000 103:05 40141614 /elf/tst-decorate-maps 5649d36c4000-5649d36e5000 rw-p 00000000 00:00 0 [heap] 7fc76c000000-7fc76c021000 rw-p 00000000 00:00 0 [anon: glibc: malloc arena] 7fc76c021000-7fc770000000 ---p 00000000 00:00 0 7fc774000000-7fc774021000 rw-p 00000000 00:00 0 [anon: glibc: malloc arena] 7fc774021000-7fc778000000 ---p 00000000 00:00 0 7fc77c000000-7fc77c021000 rw-p 00000000 00:00 0 [anon: glibc: malloc arena] 7fc77c021000-7fc780000000 ---p 00000000 00:00 0 7fc784000000-7fc784021000 rw-p 00000000 00:00 0 [anon: glibc: malloc arena] 7fc784021000-7fc788000000 ---p 00000000 00:00 0 7fc788000000-7fc788021000 rw-p 00000000 00:00 0 [anon: glibc: malloc arena] 7fc788021000-7fc78c000000 ---p 00000000 00:00 0 7fc78c000000-7fc78c021000 rw-p 00000000 00:00 0 [anon: glibc: malloc arena] 7fc78c021000-7fc790000000 ---p 00000000 00:00 0 7fc790000000-7fc790021000 rw-p 00000000 00:00 0 [anon: glibc: malloc arena] 7fc790021000-7fc794000000 ---p 00000000 00:00 0 7fc796800000-7fc797000000 rw-p 00000000 00:00 0 [anon: glibc: pthread stack: 2188506] 7fc797000000-7fc797800000 rw-p 00000000 00:00 0 [anon: glibc: pthread stack: 2188505] 7fc797800000-7fc798000000 rw-p 00000000 00:00 0 [anon: glibc: pthread stack: 2188504] 7fc798000000-7fc798800000 rw-p 00000000 00:00 0 [anon: glibc: pthread stack: 2188503] 7fc798800000-7fc799000000 rw-p 00000000 00:00 0 [anon: glibc: pthread stack: 2188502] 7fc799000000-7fc799800000 rw-p 00000000 00:00 0 [anon: glibc: pthread stack: 2188501] 7fc799800000-7fc79a000000 rw-p 00000000 00:00 0 [anon: glibc: pthread stack: 2188500] 7fc79a000000-7fc79a800000 rw-p 00000000 00:00 0 [anon: glibc: pthread stack: 2188499] 7fc79a800000-7fc79a826000 r--p 00000000 103:05 38343761 /libc.so 7fc79a826000-7fc79a99a000 r-xp 00026000 103:05 38343761 /libc.so 7fc79a99a000-7fc79a9f1000 r--p 0019a000 103:05 38343761 /libc.so 7fc79a9f1000-7fc79a9f5000 r--p 001f0000 103:05 38343761 /libc.so 7fc79a9f5000-7fc79a9f7000 rw-p 001f4000 103:05 38343761 /libc.so 7fc79a9f7000-7fc79aa04000 rw-p 00000000 00:00 0 7fc79aabb000-7fc79aafb000 rw-p 00000000 00:00 0 [anon: glibc: pthread user stack: 2188508] 7fc79aafb000-7fc79ab3b000 rw-p 00000000 00:00 0 [anon: glibc: pthread user stack: 2188507] 7fc79ab3b000-7fc79ab7c000 rw-p 00000000 00:00 0 [anon: glibc: malloc] 7fc79ab7c000-7fc79ab7d000 rw-s 00000000 00:01 19458 /dev/zero (deleted) 7fc79ab7d000-7fc79ab82000 rw-p 00000000 00:00 0 [anon: glibc: loader malloc] 7fc79ab82000-7fc79ab83000 r--p 00000000 103:05 40141609 /elf/ld.so 7fc79ab83000-7fc79aba9000 r-xp 00001000 103:05 40141609 /elf/ld.so 7fc79aba9000-7fc79abb3000 r--p 00027000 103:05 40141609 /elf/ld.so 7fc79abb3000-7fc79abb5000 r--p 00031000 103:05 40141609 /elf/ld.so 7fc79abb5000-7fc79abb7000 rw-p 00033000 103:05 40141609 /elf/ld.so 7ffdb2f1d000-7ffdb2f3f000 rw-p 00000000 00:00 0 [stack] 7ffdb2f7a000-7ffdb2f7e000 r--p 00000000 00:00 0 [vvar] 7ffdb2f7e000-7ffdb2f80000 r-xp 00000000 00:00 0 [vdso] ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0 [vsyscall] The PR_SET_VMA_ANON_NAME support is currently only enabled through a configurable kernel switch, mainly because assigning a name to a anonymous virtual memory area might prevent that area from being merged with adjacent virtual memory areas. There is also a potential scalability issue, where the prctl requires take the mmap global lock and it still not fully fixed in Linux [1] (for pthread stacks and arenas, it is mitigated by the stack cached and the arena reuse). So the decoration is only enable through a new tunable, glibc.mem.decorate_maps. [1] https://github.com/torvalds/linux/commit/65376df582174ffcec9e6471bf5b0dd79ba05e4a [1] https://github.com/torvalds/linux/commit/9a10064f5625d5572c3626c1516e0bebc6c9fe9b Changes from v1: * Fixed arm thumb build. * Added decoration on assert and __libc_fatal. Adhemerval Zanella (7): linux: Add PR_SET_VMA_ANON_NAME support support: Add support_set_vma_name nptl: Decorate thread stack on pthread_create malloc: Decorate malloc maps assert: Decorate error message buffer linux: Decorate __libc_fatal error buffer elf: Add glibc.mem.decorate_maps tunable NEWS | 5 + assert/assert.c | 2 + elf/Makefile | 7 + elf/dl-minimal-malloc.c | 2 + elf/dl-tunables.list | 5 + elf/tst-decorate-maps.c | 197 +++++++++++++++++++++++++++ include/sys/prctl.h | 5 + malloc/arena.c | 4 + malloc/malloc.c | 5 + manual/tunables.texi | 12 ++ nptl/Makefile | 4 + nptl/allocatestack.c | 40 ++++++ nptl/pthread_create.c | 6 + support/Makefile | 1 + support/support.h | 4 + support/support_set_vma_name.c | 49 +++++++ sysdeps/generic/setvmaname.h | 27 ++++ sysdeps/posix/libc_fatal.c | 3 + sysdeps/unix/sysv/linux/Makefile | 1 + sysdeps/unix/sysv/linux/setvmaname.c | 48 +++++++ sysdeps/unix/sysv/linux/setvmaname.h | 36 +++++ 21 files changed, 463 insertions(+) create mode 100644 elf/tst-decorate-maps.c create mode 100644 support/support_set_vma_name.c create mode 100644 sysdeps/generic/setvmaname.h create mode 100644 sysdeps/unix/sysv/linux/setvmaname.c create mode 100644 sysdeps/unix/sysv/linux/setvmaname.h