Public bug reported:
It seems that expansion of the $PLATFORM dynamic linker variable has
changed between xenial and bionic:
rojer@xenial$ apt-cache policy libc6
libc6:
Installed: 2.23-0ubuntu10
Candidate: 2.23-0ubuntu10
rojer@xenial$ LD_PRELOAD='/foo/$LIB/$PLATFORM/bar.so' strace -f /bin/true 2>&1
| grep '^open.*foo'
open("/foo/lib/x86_64-linux-gnu/x86_64/bar.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT
(No such file or directory)
rojer@bionic$ apt-cache policy libc6
libc6:
Installed: 2.27-3ubuntu1
Candidate: 2.27-3ubuntu1
rojer@bionic$ LD_PRELOAD='/foo/$LIB/$PLATFORM/bar.so' strace -f /bin/true 2>&1
| grep '^open.*foo'
openat(AT_FDCWD, "/foo/lib/x86_64-linux-gnu/haswell/bar.so",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
What was `x86_64` before has changed to `haswell` which is way too
specific and also doesn't match the man page for ld.so which clearly
states:
$PLATFORM (or equivalently ${PLATFORM})
This expands to a string corresponding to the processor type of
the host system (e.g., "x86_64"). On some architectures, the Linux kernel
doesn't provide a platform string to the dynamic linker. The value of this
string is taken
from the AT_PLATFORM value in the auxiliary vector (see
getauxval(3)).
I verified that `getauxval(AT_PLATFORM)` still returns `x86_64`.
** Affects: glibc (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1780723
Title:
Wrong expansion of $PLATFORM by ld.so on 18.04
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