D27666.id97379.diff
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D27666.id97379.diff
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	diff --git a/sys/kern/imgact_elf.c b/sys/kern/imgact_elf.c
	--- a/sys/kern/imgact_elf.c
	+++ b/sys/kern/imgact_elf.c
	@@ -161,19 +161,34 @@
	"");
	#define ASLR_NODE_OID __CONCAT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), _aslr)

	-static int __elfN(aslr_enabled) = 0;
	+/*
	+ * While for 64-bit machines ASLR works properly, there are
	+ * still some problems when using 32-bit architectures. For this
	+ * reason ASLR is only enabled by default when running native
	+ * 64-bit executables.
	+ */
	+static int __elfN(aslr_enabled) = __ELF_WORD_SIZE == 64;
	SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, enable, CTLFLAG_RWTUN,
	&__elfN(aslr_enabled), 0,
	__XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
	": enable address map randomization");

	-static int __elfN(pie_aslr_enabled) = 0;
	+/*
	+ * Use randomization for PIE binaries by default - setting
	+ * valid only for the ASLR enabled case.
	+ */
	+static int __elfN(pie_aslr_enabled) = 1;
	SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, pie_enable, CTLFLAG_RWTUN,
	&__elfN(pie_aslr_enabled), 0,
	__XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
	": enable address map randomization for PIE binaries");

	-static int __elfN(aslr_honor_sbrk) = 1;
	+/*
	+ * Sbrk is now deprecated and it can be assumed, that in most
	+ * cases it will not be used anyway. This setting is valid only
	+ * for the ASLR enabled and allows for utilizing the bss grow region.
	+ */
	+static int __elfN(aslr_honor_sbrk) = 0;
	SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, honor_sbrk, CTLFLAG_RW,
	&__elfN(aslr_honor_sbrk), 0,
	__XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": assume sbrk is used");