Public bug reported:
Calling printf functions from an rtld-audit wrapped function - not even
the wrapper itself - results in a segfault from apparently ld-linux.so.
[A complete example will be attached to this bugreport.]
When the following function is called via a rtld-audit rebound wrapper,
a segfault will occur on the last printf-call (the one with the %f
format.) This segfault apparently happens on return from the dynamic
linker itself, which seems to break its stack.
,-----
| int fourtytwo(void) {
| printf("42.%s\n", __func__);
| printf("42.%s The current float is %a\n", __func__, 42.1618);
| printf("42.%s The current float is %f\n", __func__, 42.1618);
| return 42;
| }
`-----
Ubuntu Version:
Description: Ubuntu 19.10
Release: 19.10
Package Version:
libc6:
Installed: 2.30-0ubuntu2.1
Candidate: 2.30-0ubuntu2.1
Version table:
*** 2.30-0ubuntu2.1 500
500 http://de.archive.ubuntu.com/ubuntu eoan-updates/main amd64 Packages
100 /var/lib/dpkg/status
2.30-0ubuntu2 500
500 http://de.archive.ubuntu.com/ubuntu eoan/main amd64 Packages
** Affects: glibc (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "Example reproducing the observed behavior."
https://bugs.launchpad.net/bugs/1871762/+attachment/5350090/+files/rtld-audit-repro.tar.xz
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https://bugs.launchpad.net/bugs/1871762
Title:
Calling printf with %f format from rtld-audit bound functions results
in a segfault.
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