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check-execstack: Permit sysdeps to xfail some libs

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* scripts/check-execstack.awk: Consider `xfail' variable containing a
	list
	of libraries whose stack executability is expected.
	* elf/Makefile ($(objpfx)check-execstack.out): Pass
	$(check-execstack-xfail) to check-execstack.awk through `xfail'
	variable.
	* sysdeps/mach/hurd/i386/Makefile (check-execstack-xfail): Set to ld.so
	libc.so libpthread.so.
This commit is contained in:
Samuel Thibault 2018-07-20 02:49:44 +02:00
parent 8ba1520e8c
commit 2d5c41ded9
4 changed files with 36 additions and 6 deletions
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7
ChangeLog
View File

@ -6,6 +6,13 @@
hidden prototypes. hidden prototypes.
* sysdeps/mach/include/mach-shortcuts-hidden.h [!_ISOMAC]: Likewise. * sysdeps/mach/include/mach-shortcuts-hidden.h [!_ISOMAC]: Likewise.
* sysdeps/mach/include/mach/mach_traps.h [!_ISOMAC]: Likewise. * sysdeps/mach/include/mach/mach_traps.h [!_ISOMAC]: Likewise.
* scripts/check-execstack.awk: Consider `xfail' variable containing a
list of libraries whose stack executability is expected.
* elf/Makefile ($(objpfx)check-execstack.out): Pass
$(check-execstack-xfail) to check-execstack.awk through `xfail'
variable.
* sysdeps/mach/hurd/i386/Makefile (check-execstack-xfail): Set to ld.so
libc.so libpthread.so.
2018-07-20 Thomas Schwinge <tschwinge@gnu.org> 2018-07-20 Thomas Schwinge <tschwinge@gnu.org>

2
elf/Makefile
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@ -1103,7 +1103,7 @@ common-generated += $(all-built-dso:$(common-objpfx)%=%.phdr)
$(objpfx)check-execstack.out: $(..)scripts/check-execstack.awk \ $(objpfx)check-execstack.out: $(..)scripts/check-execstack.awk \
$(objpfx)execstack-default \ $(objpfx)execstack-default \
$(all-built-dso:=.phdr) $(all-built-dso:=.phdr)
LC_ALL=C $(AWK) -f $^ > $@; \ LC_ALL=C $(AWK) -v "xfail=$(check-execstack-xfail)" -f $^ > $@; \
$(evaluate-test) $(evaluate-test)
generated += check-execstack.out generated += check-execstack.out

27
scripts/check-execstack.awk
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@ -6,7 +6,12 @@
# It fails (1) if any did indicate executable stack. # It fails (1) if any did indicate executable stack.
# It fails (2) if the input did not take the expected form. # It fails (2) if the input did not take the expected form.
BEGIN { result = sanity = 0; default_exec = -1 } BEGIN {
result = sanity = 0; default_exec = -1;
split(xfail, xfails, " ");
for (x in xfails)
expected_fails[xfails[x] ".phdr"] = 1;
}
/^execstack-no$/ { default_exec = 0; next } /^execstack-no$/ { default_exec = 0; next }
/^execstack-yes$/ { default_exec = 1; next } /^execstack-yes$/ { default_exec = 1; next }
@ -17,6 +22,10 @@ function check_one(name) {
result = 2; result = 2;
} }
n = split(name, parts, "/");
basename = parts[n];
expected_fail = basename in expected_fails;
if (!sanity) { if (!sanity) {
print name ": *** input did not look like readelf -l output"; print name ": *** input did not look like readelf -l output";
result = 2; result = 2;
@ -24,12 +33,20 @@ function check_one(name) {
if (stack_line ~ /^.*RW .*$/) { if (stack_line ~ /^.*RW .*$/) {
print name ": OK"; print name ": OK";
} else if (stack_line ~ /^.*E.*$/) { } else if (stack_line ~ /^.*E.*$/) {
print name ": *** executable stack signaled"; if (expected_fail) {
result = result ? result : 1; print name ": *** executable stack signaled, expected";
} else {
print name ": *** executable stack signaled";
result = result ? result : 1;
}
} }
} else if (default_exec) { } else if (default_exec) {
print name ": *** no PT_GNU_STACK entry"; if (expected_fail) {
result = result ? result : 1; print name ": *** no PT_GNU_STACK entry, expected";
} else {
print name ": *** no PT_GNU_STACK entry";
result = result ? result : 1;
}
} else { } else {
print name ": no PT_GNU_STACK but default is OK"; print name ": no PT_GNU_STACK but default is OK";
} }

6
sysdeps/mach/hurd/i386/Makefile
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@ -96,3 +96,9 @@ endif
ifeq ($(subdir),mach) ifeq ($(subdir),mach)
test-xfail-check-abi-libmachuser = yes test-xfail-check-abi-libmachuser = yes
endif endif
ifeq ($(subdir),elf)
# We do use nested functions involving creation of trampolines, notably for
# callbacks whose parameters don't permit to get the context parameters.
check-execstack-xfail += ld.so libc.so libpthread.so
endif