diff options
| author | Siddhesh Poyarekar <siddhesh@sourceware.org> | 2021-07-22 18:38:10 +0530 |
|---|---|---|
| committer | Siddhesh Poyarekar <siddhesh@sourceware.org> | 2021-07-22 18:38:10 +0530 |
| commit | 0552fd2c7d4e8a570cb4fe4dfe65e96f6d24b0cd (patch) | |
| tree | baf150b3e1b728c6c13b95116241a61bff5f21ab /NEWS | |
| parent | b5bd5bfe88f496463ec9fab680a8edf64d7c2a42 (diff) | |
| download | glibc-0552fd2c7d4e8a570cb4fe4dfe65e96f6d24b0cd.tar.gz glibc-0552fd2c7d4e8a570cb4fe4dfe65e96f6d24b0cd.tar.xz glibc-0552fd2c7d4e8a570cb4fe4dfe65e96f6d24b0cd.zip | |
Move malloc_{g,s}et_state to libc_malloc_debug
These deprecated functions are only safe to call from __malloc_initialize_hook and as a result, are not useful in the general case. Move the implementations to libc_malloc_debug so that existing binaries that need it will now have to preload the debug DSO to work correctly. This also allows simplification of the core malloc implementation by dropping all the undumping support code that was added to make malloc_set_state work. One known breakage is that of ancient emacs binaries that depend on this. They will now crash when running with this libc. With LD_BIND_NOW=1, it will terminate immediately because of not being able to find malloc_set_state but with lazy binding it will crash in unpredictable ways. It will need a preloaded libc_malloc_debug.so so that its initialization hook is executed to allow its malloc implementation to work properly. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/NEWS b/NEWS index fa80c9685b..e26a9e2c17 100644 --- a/NEWS +++ b/NEWS @@ -138,6 +138,11 @@ Deprecated and removed features, and other changes affecting compatibility: features now need to preload a new debugging DSO libc_malloc_debug.so to get this functionality back. +* The deprecated functions malloc_get_state and malloc_set_state have been + moved from the core C library into libc_malloc_debug.so. Legacy applications + that still use these functions will now need to preload libc_malloc_debug.so + in their environment using the LD_PRELOAD environment variable. + Changes to build and runtime requirements: * On Linux, the shm_open, sem_open, and related functions now expect the |