I have an app that needs to be tested with a fixed date so I wrap it with faketime.
That works fine unless the app was built with Address Sanitizer (-fsanitize).
ASAN requires its shared object to be loaded first but doing so causes faketime to fail to parse the timestamp string.
$ gcc -fsanitize=address hello.c -o hello
$ ./hello
hello world
$ faketime "2021-08-19 12:00:00" ./hello
==1176412==ASan runtime does not come first in initial library list; you should either link runtime to your application or manually preload it with LD_PRELOAD.
OK, so lets use LD_PRELOAD.
Find libasan.so
$ gcc -print-file-name=libasan.so
/usr/lib/gcc/x86_64-linux-gnu/13/libasan.so
LD_PRELOAD=$(gcc -print-file-name=libasan.so) faketime "2021-08-19 12:00:00" ./hello
Error: Timestamp to fake not recognized, please re-try with a different timestamp.
The timestamp used works fine with any non-ASAN executable:
$ faketime "2021-08-19 12:00:00" date
Thu Aug 19 12:00:00 PM EDT 2021
But not when ASAN is preloaded:
$ LD_PRELOAD=$(gcc -print-file-name=libasan.so) faketime "2021-08-19 12:00:00" date
Error: Timestamp to fake not recognized, please re-try with a different timestamp.
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 24.04.1 LTS
Release: 24.04
Codename: noble
$ faketime --version
faketime: Version 0.9.10
Identical results are seen when building the latest version v0.9.12 from github.
I have an app that needs to be tested with a fixed date so I wrap it with faketime.
That works fine unless the app was built with Address Sanitizer (-fsanitize).
ASAN requires its shared object to be loaded first but doing so causes faketime to fail to parse the timestamp string.
$ gcc -fsanitize=address hello.c -o hello
$ ./hello
hello world
$ faketime "2021-08-19 12:00:00" ./hello
==1176412==ASan runtime does not come first in initial library list; you should either link runtime to your application or manually preload it with LD_PRELOAD.
OK, so lets use LD_PRELOAD.
Find libasan.so
$ gcc -print-file-name=libasan.so
/usr/lib/gcc/x86_64-linux-gnu/13/libasan.so
LD_PRELOAD=$(gcc -print-file-name=libasan.so) faketime "2021-08-19 12:00:00" ./hello
Error: Timestamp to fake not recognized, please re-try with a different timestamp.
The timestamp used works fine with any non-ASAN executable:
$ faketime "2021-08-19 12:00:00" date
Thu Aug 19 12:00:00 PM EDT 2021
But not when ASAN is preloaded:
$ LD_PRELOAD=$(gcc -print-file-name=libasan.so) faketime "2021-08-19 12:00:00" date
Error: Timestamp to fake not recognized, please re-try with a different timestamp.
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 24.04.1 LTS
Release: 24.04
Codename: noble
$ faketime --version
faketime: Version 0.9.10
Identical results are seen when building the latest version v0.9.12 from github.