Commit a6d3bd27 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64 

Pull arm64 fixes from Catalin Marinas:
 - Page protection fixes, including proper PAGE_NONE handling
 - Timezone vdso sequence counting fix
 - Additional compat syscall wiring

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64:
  arm64: compat: add syscall table entries for new syscalls
  arm64: mm: introduce present, faulting entries for PAGE_NONE
  arm64: mm: only wrprotect clean ptes if they are present
  arm64: vdso: remove broken, redundant sequence counting for timezones
parents 2409c873 72d0ac04

arch/arm64/include/asm/pgtable.h

+20 −16
Original line number Diff line number Diff line
@@ -24,7 +24,8 @@ 
/*

 * Software defined PTE bits definition.

 */

#define PTE_VALID		(_AT(pteval_t, 1) << 0)	/* pte_present() check */

#define PTE_VALID		(_AT(pteval_t, 1) << 0)

#define PTE_PROT_NONE		(_AT(pteval_t, 1) << 1)	/* only when !PTE_VALID */

#define PTE_FILE		(_AT(pteval_t, 1) << 2)	/* only when !pte_present() */

#define PTE_DIRTY		(_AT(pteval_t, 1) << 55)

#define PTE_SPECIAL		(_AT(pteval_t, 1) << 56)
@@ -60,9 +61,12 @@ extern void __pgd_error(const char *file, int line, unsigned long val); 


extern pgprot_t pgprot_default;



#define _MOD_PROT(p, b)	__pgprot(pgprot_val(p) | (b))

#define __pgprot_modify(prot,mask,bits) \

	__pgprot((pgprot_val(prot) & ~(mask)) | (bits))



#define PAGE_NONE		_MOD_PROT(pgprot_default, PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)

#define _MOD_PROT(p, b)		__pgprot_modify(p, 0, b)



#define PAGE_NONE		__pgprot_modify(pgprot_default, PTE_TYPE_MASK, PTE_PROT_NONE)

#define PAGE_SHARED		_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)

#define PAGE_SHARED_EXEC	_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN)

#define PAGE_COPY		_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
@@ -72,7 +76,7 @@ extern pgprot_t pgprot_default; 
#define PAGE_KERNEL		_MOD_PROT(pgprot_default, PTE_PXN | PTE_UXN | PTE_DIRTY)

#define PAGE_KERNEL_EXEC	_MOD_PROT(pgprot_default, PTE_UXN | PTE_DIRTY)



#define __PAGE_NONE		__pgprot(_PAGE_DEFAULT | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)

#define __PAGE_NONE		__pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE)

#define __PAGE_SHARED		__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)

#define __PAGE_SHARED_EXEC	__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN)

#define __PAGE_COPY		__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
@@ -125,16 +129,15 @@ extern struct page *empty_zero_page; 
/*

 * The following only work if pte_present(). Undefined behaviour otherwise.

 */

#define pte_present(pte)	(pte_val(pte) & PTE_VALID)

#define pte_present(pte)	(pte_val(pte) & (PTE_VALID | PTE_PROT_NONE))

#define pte_dirty(pte)		(pte_val(pte) & PTE_DIRTY)

#define pte_young(pte)		(pte_val(pte) & PTE_AF)

#define pte_special(pte)	(pte_val(pte) & PTE_SPECIAL)

#define pte_write(pte)		(!(pte_val(pte) & PTE_RDONLY))

#define pte_exec(pte)		(!(pte_val(pte) & PTE_UXN))



#define pte_present_exec_user(pte) \

	((pte_val(pte) & (PTE_VALID | PTE_USER | PTE_UXN)) == \

	 (PTE_VALID | PTE_USER))

#define pte_valid_user(pte) \

	((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER))



#define PTE_BIT_FUNC(fn,op) \

static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
@@ -157,10 +160,13 @@ extern void __sync_icache_dcache(pte_t pteval, unsigned long addr); 
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,

			      pte_t *ptep, pte_t pte)

{

	if (pte_present_exec_user(pte))

	if (pte_valid_user(pte)) {

		if (pte_exec(pte))

			__sync_icache_dcache(pte, addr);

		if (!pte_dirty(pte))

			pte = pte_wrprotect(pte);

	}



	set_pte(ptep, pte);

}
@@ -170,9 +176,6 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 
#define pte_huge(pte)		((pte_val(pte) & PTE_TYPE_MASK) == PTE_TYPE_HUGEPAGE)

#define pte_mkhuge(pte)		(__pte((pte_val(pte) & ~PTE_TYPE_MASK) | PTE_TYPE_HUGEPAGE))



#define __pgprot_modify(prot,mask,bits)		\

	__pgprot((pgprot_val(prot) & ~(mask)) | (bits))



#define __HAVE_ARCH_PTE_SPECIAL



/*
@@ -264,7 +267,8 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) 


static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)

{

	const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY;

	const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY |

			      PTE_PROT_NONE | PTE_VALID;

	pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);

	return pte;

}

arch/arm64/include/asm/unistd32.h

+6 −1
Original line number Diff line number Diff line
@@ -395,8 +395,13 @@ __SYSCALL(370, sys_name_to_handle_at) 
__SYSCALL(371, compat_sys_open_by_handle_at)

__SYSCALL(372, compat_sys_clock_adjtime)

__SYSCALL(373, sys_syncfs)

__SYSCALL(374, compat_sys_sendmmsg)

__SYSCALL(375, sys_setns)

__SYSCALL(376, compat_sys_process_vm_readv)

__SYSCALL(377, compat_sys_process_vm_writev)

__SYSCALL(378, sys_ni_syscall)			/* 378 for kcmp */



#define __NR_compat_syscalls		374

#define __NR_compat_syscalls		379



/*

 * Compat syscall numbers used by the AArch64 kernel.

arch/arm64/kernel/vdso.c

+0 −4
Original line number Diff line number Diff line
@@ -252,10 +252,6 @@ void update_vsyscall(struct timekeeper *tk) 


void update_vsyscall_tz(void)

{

	++vdso_data->tb_seq_count;

	smp_wmb();

	vdso_data->tz_minuteswest	= sys_tz.tz_minuteswest;

	vdso_data->tz_dsttime		= sys_tz.tz_dsttime;

	smp_wmb();

	++vdso_data->tb_seq_count;

}

arch/arm64/kernel/vdso/gettimeofday.S

+0 −2
Original line number Diff line number Diff line
@@ -73,8 +73,6 @@ ENTRY(__kernel_gettimeofday) 
	/* If tz is NULL, return 0. */

	cbz	x1, 3f

	ldp	w4, w5, [vdso_data, #VDSO_TZ_MINWEST]

	seqcnt_read w9

	seqcnt_check w9, 1b

	stp	w4, w5, [x1, #TZ_MINWEST]

3:

	mov	x0, xzr

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