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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-11-06 17:25:37 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-11-21 16:15:42 -0300 |
| commit | 11f7e3dd8fed66e0b8740af440cd3151e55a466f (patch) | |
| tree | 69169ddfeb2a8d757a42de6e00707dc4ff247f7f /sysdeps/generic | |
| parent | 9c96c87d60eafa4d78406e606e92b42bd4b570ad (diff) | |
| download | glibc-11f7e3dd8fed66e0b8740af440cd3151e55a466f.tar glibc-11f7e3dd8fed66e0b8740af440cd3151e55a466f.tar.gz glibc-11f7e3dd8fed66e0b8740af440cd3151e55a466f.tar.bz2 glibc-11f7e3dd8fed66e0b8740af440cd3151e55a466f.zip | |
elf: Add all malloc tunable to unsecvars
Some environment variables allow alteration of allocator behavior
across setuid boundaries, where a setuid program may ignore the
tunable, but its non-setuid child can read it and adjust the memory
allocator behavior accordingly.
Most library behavior tunings is limited to the current process and does
not bleed in scope; so it is unclear how pratical this misfeature is.
If behavior change across privilege boundaries is desirable, it would be
better done with a wrapper program around the non-setuid child that sets
these envvars, instead of using the setuid process as the messenger.
The patch as fixes tst-env-setuid, where it fail if any unsecvars is
set. It also adds a dynamic test, although it requires
--enable-hardcoded-path-in-tests so kernel correctly sets the setuid
bit (using the loader command directly would require to set the
setuid bit on the loader itself, which is not a usual deployment).
Co-authored-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Checked on x86_64-linux-gnu.
Reviewed-by: DJ Delorie <dj@redhat.com>
Diffstat (limited to 'sysdeps/generic')
| -rw-r--r-- | sysdeps/generic/unsecvars.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sysdeps/generic/unsecvars.h b/sysdeps/generic/unsecvars.h index 81397fb90b..f7ebed60e5 100644 --- a/sysdeps/generic/unsecvars.h +++ b/sysdeps/generic/unsecvars.h @@ -18,7 +18,14 @@ "LD_SHOW_AUXV\0" \ "LOCALDOMAIN\0" \ "LOCPATH\0" \ + "MALLOC_ARENA_MAX\0" \ + "MALLOC_ARENA_TEST\0" \ + "MALLOC_MMAP_MAX_\0" \ + "MALLOC_MMAP_THRESHOLD_\0" \ + "MALLOC_PERTURB_\0" \ + "MALLOC_TOP_PAD_\0" \ "MALLOC_TRACE\0" \ + "MALLOC_TRIM_THRESHOLD_\0" \ "NIS_PATH\0" \ "NLSPATH\0" \ "RESOLV_HOST_CONF\0" \ |