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| author | Florian Weimer <fweimer@redhat.com> | 2021-02-03 08:55:13 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-02-08 14:10:42 -0300 |
| commit | e9fed2438a1ff475821864f906286dc58907f06b (patch) | |
| tree | 185b4a49e256ef312e65eafebf836ba17ea2ccef /NEWS | |
| parent | 7f61f785f16d22f185de77086c44a88218436cfb (diff) | |
| download | glibc-e9fed2438a1ff475821864f906286dc58907f06b.tar.gz glibc-e9fed2438a1ff475821864f906286dc58907f06b.tar.xz glibc-e9fed2438a1ff475821864f906286dc58907f06b.zip | |
linux: Require /dev/shm as the shared memory file system
Previously, glibc would pick an arbitrary tmpfs file system from /proc/mounts if /dev/shm was not available. This could lead to an unsuitable file system being picked for the backing storage for shm_open, sem_open, and related functions. This patch introduces a new function, __shm_get_name, which builds the file name under the appropriate (now hard-coded) directory. It is called from the various shm_* and sem_* function. Unlike the SHM_GET_NAME macro it replaces, the callers handle the return values and errno updates. shm-directory.c is moved directly into the posix subdirectory because it can be implemented directly using POSIX functionality. It resides in libc because it is needed by both librt and nptl/htl. In the sem_open implementation, tmpfname is initialized directly from a string constant. This happens to remove one alloca call. Checked on x86_64-linux-gnu.
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/NEWS b/NEWS index 1ca12bc1a2..85e84fe536 100644 --- a/NEWS +++ b/NEWS @@ -20,7 +20,10 @@ Deprecated and removed features, and other changes affecting compatibility: Changes to build and runtime requirements: - [Add changes to build and runtime requirements here] +* On Linux, the shm_open, sem_open, and related functions now expect the + file shared memory file system to be mounted at /dev/shm. These functions + no longer search among the system's mount points for a suitable + replacement if /dev/shm is not available. Security related changes: |