Merge tag 's390-6.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Vasily Gorbik: - Add support for stackleak feature. Also allow specifying architecture-specific stackleak poison function to enable faster implementation. On s390, the mvc-based implementation helps decrease typical overhead from a factor of 3 to just 25% - Convert all assembler files to use SYM* style macros, deprecating the ENTRY() macro and other annotations. Select ARCH_USE_SYM_ANNOTATIONS - Improve KASLR to also randomize module and special amode31 code base load addresses - Rework decompressor memory tracking to support memory holes and improve error handling - Add support for protected virtualization AP binding - Add support for set_direct_map() calls - Implement set_memory_rox() and noexec module_alloc() - Remove obsolete overriding of mem*() functions for KASAN - Rework kexec/kdump to avoid using nodat_stack to call purgatory - Convert the rest of the s390 code to use flexible-array member instead of a zero-length array - Clean up uaccess inline asm - Enable ARCH_HAS_MEMBARRIER_SYNC_CORE - Convert to using CONFIG_FUNCTION_ALIGNMENT and enable DEBUG_FORCE_FUNCTION_ALIGN_64B - Resolve last_break in userspace fault reports - Simplify one-level sysctl registration - Clean up branch prediction handling - Rework CPU counter facility to retrieve available counter sets just once - Other various small fixes and improvements all over the code * tag 's390-6.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (118 commits) s390/stackleak: provide fast __stackleak_poison() implementation stackleak: allow to specify arch specific stackleak poison function s390: select ARCH_USE_SYM_ANNOTATIONS s390/mm: use VM_FLUSH_RESET_PERMS in module_alloc() s390: wire up memfd_secret system call s390/mm: enable ARCH_HAS_SET_DIRECT_MAP s390/mm: use BIT macro to generate SET_MEMORY bit masks s390/relocate_kernel: adjust indentation s390/relocate_kernel: use SYM* macros instead of ENTRY(), etc. s390/entry: use SYM* macros instead of ENTRY(), etc. s390/purgatory: use SYM* macros instead of ENTRY(), etc. s390/kprobes: use SYM* macros instead of ENTRY(), etc. s390/reipl: use SYM* macros instead of ENTRY(), etc. s390/head64: use SYM* macros instead of ENTRY(), etc. s390/earlypgm: use SYM* macros instead of ENTRY(), etc. s390/mcount: use SYM* macros instead of ENTRY(), etc. s390/crc32le: use SYM* macros instead of ENTRY(), etc. s390/crc32be: use SYM* macros instead of ENTRY(), etc. s390/crypto,chacha: use SYM* macros instead of ENTRY(), etc. s390/amode31: use SYM* macros instead of ENTRY(), etc. ...

Linus Torvalds committed 3 years ago

Commit 10de6382 parents d55571c 2a405f699 files · +2784 −2436Browse files

Showing the changes to kernel (1 of 99 files). Show all

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kernel/stackleak.c+13−4

@@ -70,6 +70,18 @@ late_initcall(stackleak_sysctls_init); · 69 unmodified lines
70	70	#define skip_erasing() false
71	71	#endif /* CONFIG_STACKLEAK_RUNTIME_DISABLE */
72	72
	73	+#ifndef __stackleak_poison
	74	+static __always_inline void __stackleak_poison(unsigned long erase_low,
	75	+ unsigned long erase_high,
	76	+ unsigned long poison)
	77	+{
	78	+ while (erase_low < erase_high) {
	79	+ (unsigned long )erase_low = poison;
	80	+ erase_low += sizeof(unsigned long);
	81	+ }
	82	+}
	83	+#endif
	84	+
73	85	static __always_inline void __stackleak_erase(bool on_task_stack)
74	86	{
75	87	const unsigned long task_stack_low = stackleak_task_low_bound(current);
@@ -101,10 +113,7 @@ static __always_inline void __stackleak_erase(bool on_task_stack) · 25 unmodified lines
101	113	else
102	114	erase_high = task_stack_high;
103	115
104		− while (erase_low < erase_high) {
105		− (unsigned long )erase_low = STACKLEAK_POISON;
106		− erase_low += sizeof(unsigned long);
107		− }
	116	+ __stackleak_poison(erase_low, erase_high, STACKLEAK_POISON);
108	117
109	118	/* Reset the 'lowest_stack' value for the next syscall */
110	119	current->lowest_stack = task_stack_high;