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elf: Add elf/check-wx-segment, a test for the presence of WX segments

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Writable, executable segments defeat security hardening.  The
existing check for DT_TEXTREL does not catch this.

hppa and SPARC currently keep the PLT in an RWX load segment.
This commit is contained in:
Florian Weimer
2020-03-02 14:24:27 +01:00
parent b5b7fb76e1
commit 0499a353a6
4 changed files with 108 additions and 2 deletions
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9
sysdeps/unix/sysv/linux/hppa/Makefile
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@@ -3,9 +3,14 @@ ifeq ($(subdir),stdlib)
gen-as-const-headers += ucontext_i.sym
endif
ifeq ($(subdir),elf)
# Supporting non-executable stacks on HPPA requires changes to both
# the Linux kernel and glibc. The kernel currently needs an executable
# stack for syscall restarts and signal returns.
ifeq ($(subdir),elf)
test-xfail-check-execstack = yes
endif
# On hppa, the PLT is executable because it contains an executable
# trampoline used during lazy binding.
test-xfail-check-wx-segment = *
endif # $(subdir) == elf