Bug 20547

Summary:	Don't use AT_HWCAP for shared library search path
Product:	glibc	Reporter:	H.J. Lu <hjl.tools>
Component:	dynamic-link	Assignee:	Not yet assigned to anyone <unassigned>
Status:	RESOLVED DUPLICATE
Severity:	normal	Flags:	fweimer: security-
Priority:	P2
Version:	2.25
Target Milestone:	2.26
Host:		Target:	x86
Build:		Last reconfirmed:

Description H.J. Lu 2016-09-02 17:09:37 UTC

AT_HWCAP is treated differently on i386:

AT_HWCAP:    fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe

vs x86-64:

AT_HWCAP:        bfebfbff

as shown by LD_SHOW_AUXV. On i386, only sse2 is used for shared library search
path.  On x86-64, nothing additional directory is searched for shared library.
We can use _dl_x86_cpu_features to replace AT_HWCAP and enable additional
directories for loading shared libraries.

Comment 1 H.J. Lu 2017-05-24 17:57:33 UTC

Dup.

*** This bug has been marked as a duplicate of bug 21391 ***