selftests, powerpc, x86 : Memory Protection Keys

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index 254e543..d5779be 100644
@@ -14,7 +14,7 @@
 #include <sys/mman.h>
 
 #define NR_PKEYS 16
-#define PKRU_BITS_PER_PKEY 2
+#define PKEY_BITS_PER_PKEY 2
 
 #ifndef DEBUG_LEVEL
 #define DEBUG_LEVEL 0

@@ -53,85 +53,88 @@ static inline void sigsafe_printf(const char *format, ...)
 #define dprintf3(args...) dprintf_level(3, args)
 #define dprintf4(args...) dprintf_level(4, args)
 
-extern unsigned int shadow_pkru;
-static inline unsigned int __rdpkru(void)
+extern unsigned int shadow_pkey_reg;
+static inline unsigned int __read_pkey_reg(void)
 {
 	unsigned int eax, edx;
 	unsigned int ecx = 0;
-	unsigned int pkru;
+	unsigned int pkey_reg;
 
 	asm volatile(".byte 0x0f,0x01,0xee\n\t"
 		     : "=a" (eax), "=d" (edx)
 		     : "c" (ecx));
-	pkru = eax;
-	return pkru;
+	pkey_reg = eax;
+	return pkey_reg;
 }
 
-static inline unsigned int _rdpkru(int line)
+static inline unsigned int _read_pkey_reg(int line)
 {
-	unsigned int pkru = __rdpkru();
+	unsigned int pkey_reg = __read_pkey_reg();
 
-	dprintf4("rdpkru(line=%d) pkru: %x shadow: %x\n",
-			line, pkru, shadow_pkru);
-	assert(pkru == shadow_pkru);
+	dprintf4("read_pkey_reg(line=%d) pkey_reg: %x shadow: %x\n",
+			line, pkey_reg, shadow_pkey_reg);
+	assert(pkey_reg == shadow_pkey_reg);
 
-	return pkru;
+	return pkey_reg;
 }
 
-#define rdpkru() _rdpkru(__LINE__)
+#define read_pkey_reg() _read_pkey_reg(__LINE__)
 
-static inline void __wrpkru(unsigned int pkru)
+static inline void __write_pkey_reg(unsigned int pkey_reg)
 {
-	unsigned int eax = pkru;
+	unsigned int eax = pkey_reg;
 	unsigned int ecx = 0;
 	unsigned int edx = 0;
 
-	dprintf4("%s() changing %08x to %08x\n", __func__, __rdpkru(), pkru);
+	dprintf4("%s() changing %08x to %08x\n", __func__,
+			__read_pkey_reg(), pkey_reg);
 	asm volatile(".byte 0x0f,0x01,0xef\n\t"
 		     : : "a" (eax), "c" (ecx), "d" (edx));
-	assert(pkru == __rdpkru());
+	assert(pkey_reg == __read_pkey_reg());
 }
 
-static inline void wrpkru(unsigned int pkru)
+static inline void write_pkey_reg(unsigned int pkey_reg)
 {
-	dprintf4("%s() changing %08x to %08x\n", __func__, __rdpkru(), pkru);
+	dprintf4("%s() changing %08x to %08x\n", __func__,
+			__read_pkey_reg(), pkey_reg);
 	/* will do the shadow check for us: */
-	rdpkru();
-	__wrpkru(pkru);
-	shadow_pkru = pkru;
-	dprintf4("%s(%08x) pkru: %08x\n", __func__, pkru, __rdpkru());
+	read_pkey_reg();
+	__write_pkey_reg(pkey_reg);
+	shadow_pkey_reg = pkey_reg;
+	dprintf4("%s(%08x) pkey_reg: %08x\n", __func__,
+			pkey_reg, __read_pkey_reg());
 }
 
 /*
  * These are technically racy. since something could
- * change PKRU between the read and the write.
+ * change PKEY register between the read and the write.
  */
 static inline void __pkey_access_allow(int pkey, int do_allow)
 {
-	unsigned int pkru = rdpkru();
+	unsigned int pkey_reg = read_pkey_reg();
 	int bit = pkey * 2;
 
 	if (do_allow)
-		pkru &= (1<<bit);
+		pkey_reg &= (1<<bit);
 	else
-		pkru |= (1<<bit);
+		pkey_reg |= (1<<bit);
 
-	dprintf4("pkru now: %08x\n", rdpkru());
-	wrpkru(pkru);
+	dprintf4("pkey_reg now: %08x\n", read_pkey_reg());
+	write_pkey_reg(pkey_reg);
 }
 
 static inline void __pkey_write_allow(int pkey, int do_allow_write)
 {
-	long pkru = rdpkru();
+	long pkey_reg = read_pkey_reg();
 	int bit = pkey * 2 + 1;
 
 	if (do_allow_write)
-		pkru &= (1<<bit);
+		pkey_reg &= (1<<bit);
 	else
-		pkru |= (1<<bit);
+		pkey_reg |= (1<<bit);
 
-	wrpkru(pkru);
-	dprintf4("pkru now: %08x\n", rdpkru());
+	write_pkey_reg(pkey_reg);
+	dprintf4("pkey_reg now: %08x\n", read_pkey_reg());
 }
 
 #define PROT_PKEY0     0x10            /* protection key value (bit 0) */

@@ -181,10 +184,10 @@ static inline int cpu_has_pku(void)
 	return 1;
 }
 
-#define XSTATE_PKRU_BIT	(9)
-#define XSTATE_PKRU	0x200
+#define XSTATE_PKEY_BIT	(9)
+#define XSTATE_PKEY	0x200
 
-int pkru_xstate_offset(void)
+int pkey_reg_xstate_offset(void)
 {
 	unsigned int eax;
 	unsigned int ebx;

@@ -195,21 +198,21 @@ int pkru_xstate_offset(void)
 	unsigned long XSTATE_CPUID = 0xd;
 	int leaf;
 
-	/* assume that XSTATE_PKRU is set in XCR0 */
-	leaf = XSTATE_PKRU_BIT;
+	/* assume that XSTATE_PKEY is set in XCR0 */
+	leaf = XSTATE_PKEY_BIT;
 	{
 		eax = XSTATE_CPUID;
 		ecx = leaf;
 		__cpuid(&eax, &ebx, &ecx, &edx);
 
-		if (leaf == XSTATE_PKRU_BIT) {
+		if (leaf == XSTATE_PKEY_BIT) {
 			xstate_offset = ebx;
 			xstate_size = eax;
 		}
 	}
 
 	if (xstate_size == 0) {
-		printf("could not find size/offset of PKRU in xsave state\n");
+		printf("could not find size/offset of PKEY in xsave state\n");
 		return 0;
 	}
 

527 lines not on this page · raw message

index d5779be..6ad1bd5 100644
@@ -13,6 +13,14 @@
 #include <ucontext.h>
 #include <sys/mman.h>
 
+/* Define some kernel-like types */
+#define  u8 uint8_t
+#define u16 uint16_t
+#define u32 uint32_t
+#define u64 uint64_t
+
+#define PTR_ERR_ENOTSUP ((void *)-ENOTSUP)
+
 #define NR_PKEYS 16
 #define PKEY_BITS_PER_PKEY 2
 

@@ -53,6 +61,18 @@ static inline void sigsafe_printf(const char *format, ...)
 #define dprintf3(args...) dprintf_level(3, args)
 #define dprintf4(args...) dprintf_level(4, args)
 
+extern void abort_hooks(void);
+#define pkey_assert(condition) do {		\
+	if (!(condition)) {			\
+		dprintf0("assert() at %s::%d test_nr: %d iteration: %d\n", \
+				__FILE__, __LINE__,	\
+				test_nr, iteration_nr);	\
+		dprintf0("errno at assert: %d", errno);	\
+		abort_hooks();			\
+		exit(__LINE__);			\
+	}					\
+} while (0)
+
 extern unsigned int shadow_pkey_reg;
 static inline unsigned int __read_pkey_reg(void)
 {

@@ -137,11 +157,6 @@ static inline void __pkey_write_allow(int pkey, int do_allow_write)
 	dprintf4("pkey_reg now: %08x\n", read_pkey_reg());
 }
 
-#define PROT_PKEY0     0x10            /* protection key value (bit 0) */
-#define PROT_PKEY1     0x20            /* protection key value (bit 1) */
-#define PROT_PKEY2     0x40            /* protection key value (bit 2) */
-#define PROT_PKEY3     0x80            /* protection key value (bit 3) */
-
 #define PAGE_SIZE 4096
 #define MB	(1<<20)
 

@@ -219,4 +234,14 @@ int pkey_reg_xstate_offset(void)
 	return xstate_offset;
 }
 
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
+#define ALIGN_UP(x, align_to)	(((x) + ((align_to)-1)) & ~((align_to)-1))
+#define ALIGN_DOWN(x, align_to) ((x) & ~((align_to)-1))
+#define ALIGN_PTR_UP(p, ptr_align_to)	\
+	((typeof(p))ALIGN_UP((unsigned long)(p), ptr_align_to))
+#define ALIGN_PTR_DOWN(p, ptr_align_to)	\
+	((typeof(p))ALIGN_DOWN((unsigned long)(p), ptr_align_to))
+#define __stringify_1(x...)     #x
+#define __stringify(x...)       __stringify_1(x)
+
 #endif /* _PKEYS_HELPER_H */

index 9f373cc..cad52dc 100644
@@ -51,31 +51,10 @@
 unsigned int shadow_pkey_reg;
 
 #define HPAGE_SIZE	(1UL<<21)
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
-#define ALIGN_UP(x, align_to)	(((x) + ((align_to)-1)) & ~((align_to)-1))
-#define ALIGN_DOWN(x, align_to) ((x) & ~((align_to)-1))
-#define ALIGN_PTR_UP(p, ptr_align_to)	((typeof(p))ALIGN_UP((unsigned long)(p),	ptr_align_to))
-#define ALIGN_PTR_DOWN(p, ptr_align_to)	((typeof(p))ALIGN_DOWN((unsigned long)(p),	ptr_align_to))
-#define __stringify_1(x...)     #x
-#define __stringify(x...)       __stringify_1(x)
-
-#define PTR_ERR_ENOTSUP ((void *)-ENOTSUP)
 
 int dprint_in_signal;
 char dprint_in_signal_buffer[DPRINT_IN_SIGNAL_BUF_SIZE];
 
-extern void abort_hooks(void);
-#define pkey_assert(condition) do {		\
-	if (!(condition)) {			\
-		dprintf0("assert() at %s::%d test_nr: %d iteration: %d\n", \
-				__FILE__, __LINE__,	\
-				test_nr, iteration_nr);	\
-		dprintf0("errno at assert: %d", errno);	\
-		abort_hooks();			\
-		exit(__LINE__);			\
-	}					\
-} while (0)
-
 void cat_into_file(char *str, char *file)
 {
 	int fd = open(file, O_RDWR);

@@ -186,12 +165,6 @@ void lots_o_noops_around_write(int *write_to_me)
 	dprintf3("%s() done\n", __func__);
 }
 
-/* Define some kernel-like types */
-#define  u8 uint8_t
-#define u16 uint16_t
-#define u32 uint32_t
-#define u64 uint64_t
-
 #ifdef __i386__
 
 #ifndef SYS_mprotect_key

index 6ad1bd5..3ed2f02 100644
@@ -21,9 +21,6 @@
 
 #define PTR_ERR_ENOTSUP ((void *)-ENOTSUP)
 
-#define NR_PKEYS 16
-#define PKEY_BITS_PER_PKEY 2
-
 #ifndef DEBUG_LEVEL
 #define DEBUG_LEVEL 0
 #endif

@@ -73,19 +70,13 @@ static inline void sigsafe_printf(const char *format, ...)
 	}					\
 } while (0)
 
+#if defined(__i386__) || defined(__x86_64__) /* arch */
+#include "pkey-x86.h"
+#else /* arch */
+#error Architecture not supported
+#endif /* arch */
+
 extern unsigned int shadow_pkey_reg;
-static inline unsigned int __read_pkey_reg(void)
-{
-	unsigned int eax, edx;
-	unsigned int ecx = 0;
-	unsigned int pkey_reg;
-
-	asm volatile(".byte 0x0f,0x01,0xee\n\t"
-		     : "=a" (eax), "=d" (edx)
-		     : "c" (ecx));
-	pkey_reg = eax;
-	return pkey_reg;
-}
 
 static inline unsigned int _read_pkey_reg(int line)
 {

@@ -100,19 +91,6 @@ static inline unsigned int _read_pkey_reg(int line)
 
 #define read_pkey_reg() _read_pkey_reg(__LINE__)
 
-static inline void __write_pkey_reg(unsigned int pkey_reg)
-{
-	unsigned int eax = pkey_reg;
-	unsigned int ecx = 0;
-	unsigned int edx = 0;
-
-	dprintf4("%s() changing %08x to %08x\n", __func__,
-			__read_pkey_reg(), pkey_reg);
-	asm volatile(".byte 0x0f,0x01,0xef\n\t"
-		     : : "a" (eax), "c" (ecx), "d" (edx));
-	assert(pkey_reg == __read_pkey_reg());
-}
-
 static inline void write_pkey_reg(unsigned int pkey_reg)
 {
 	dprintf4("%s() changing %08x to %08x\n", __func__,

@@ -157,83 +135,6 @@ static inline void __pkey_write_allow(int pkey, int do_allow_write)
 	dprintf4("pkey_reg now: %08x\n", read_pkey_reg());
 }
 
-#define PAGE_SIZE 4096
-#define MB	(1<<20)
-
-static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
-		unsigned int *ecx, unsigned int *edx)
-{
-	/* ecx is often an input as well as an output. */
-	asm volatile(
-		"cpuid;"
-		: "=a" (*eax),
-		  "=b" (*ebx),
-		  "=c" (*ecx),
-		  "=d" (*edx)
-		: "0" (*eax), "2" (*ecx));
-}
-
-/* Intel-defined CPU features, CPUID level 0x00000007:0 (ecx) */
-#define X86_FEATURE_PKU        (1<<3) /* Protection Keys for Userspace */
-#define X86_FEATURE_OSPKE      (1<<4) /* OS Protection Keys Enable */
-
-static inline int cpu_has_pku(void)
-{
-	unsigned int eax;
-	unsigned int ebx;
-	unsigned int ecx;
-	unsigned int edx;
-
-	eax = 0x7;
-	ecx = 0x0;
-	__cpuid(&eax, &ebx, &ecx, &edx);
-
-	if (!(ecx & X86_FEATURE_PKU)) {
-		dprintf2("cpu does not have PKU\n");
-		return 0;
-	}
-	if (!(ecx & X86_FEATURE_OSPKE)) {
-		dprintf2("cpu does not have OSPKE\n");
-		return 0;
-	}
-	return 1;
-}
-
-#define XSTATE_PKEY_BIT	(9)
-#define XSTATE_PKEY	0x200
-
-int pkey_reg_xstate_offset(void)
-{
-	unsigned int eax;
-	unsigned int ebx;
-	unsigned int ecx;
-	unsigned int edx;
-	int xstate_offset;
-	int xstate_size;
-	unsigned long XSTATE_CPUID = 0xd;
-	int leaf;
-
-	/* assume that XSTATE_PKEY is set in XCR0 */
-	leaf = XSTATE_PKEY_BIT;
-	{
-		eax = XSTATE_CPUID;
-		ecx = leaf;
-		__cpuid(&eax, &ebx, &ecx, &edx);
-
-		if (leaf == XSTATE_PKEY_BIT) {
-			xstate_offset = ebx;
-			xstate_size = eax;
-		}
-	}
-
-	if (xstate_size == 0) {
-		printf("could not find size/offset of PKEY in xsave state\n");
-		return 0;
-	}
-
-	return xstate_offset;
-}
-
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
 #define ALIGN_UP(x, align_to)	(((x) + ((align_to)-1)) & ~((align_to)-1))
 #define ALIGN_DOWN(x, align_to) ((x) & ~((align_to)-1))

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71 lines not on this page · raw message

index 3ed2f02..7f18a82 100644
@@ -27,6 +27,10 @@
 #define DPRINT_IN_SIGNAL_BUF_SIZE 4096
 extern int dprint_in_signal;
 extern char dprint_in_signal_buffer[DPRINT_IN_SIGNAL_BUF_SIZE];
+
+#ifdef __GNUC__
+__attribute__((format(printf, 1, 2)))
+#endif
 static inline void sigsafe_printf(const char *format, ...)
 {
 	va_list ap;

index 7f18a82..2a1a024 100644
@@ -80,13 +80,14 @@ static inline void sigsafe_printf(const char *format, ...)
 #error Architecture not supported
 #endif /* arch */
 
-extern unsigned int shadow_pkey_reg;
+extern pkey_reg_t shadow_pkey_reg;
 
-static inline unsigned int _read_pkey_reg(int line)
+static inline pkey_reg_t _read_pkey_reg(int line)
 {
-	unsigned int pkey_reg = __read_pkey_reg();
+	pkey_reg_t pkey_reg = __read_pkey_reg();
 
-	dprintf4("read_pkey_reg(line=%d) pkey_reg: %x shadow: %x\n",
+	dprintf4("read_pkey_reg(line=%d) pkey_reg: "PKEY_REG_FMT
+			" shadow: "PKEY_REG_FMT"\n",
 			line, pkey_reg, shadow_pkey_reg);
 	assert(pkey_reg == shadow_pkey_reg);
 

@@ -95,15 +96,15 @@ static inline unsigned int _read_pkey_reg(int line)
 
 #define read_pkey_reg() _read_pkey_reg(__LINE__)
 
-static inline void write_pkey_reg(unsigned int pkey_reg)
+static inline void write_pkey_reg(pkey_reg_t pkey_reg)
 {
-	dprintf4("%s() changing %08x to %08x\n", __func__,
+	dprintf4("%s() changing "PKEY_REG_FMT" to "PKEY_REG_FMT"\n", __func__,
 			__read_pkey_reg(), pkey_reg);
 	/* will do the shadow check for us: */
 	read_pkey_reg();
 	__write_pkey_reg(pkey_reg);
 	shadow_pkey_reg = pkey_reg;
-	dprintf4("%s(%08x) pkey_reg: %08x\n", __func__,
+	dprintf4("%s("PKEY_REG_FMT") pkey_reg: "PKEY_REG_FMT"\n", __func__,
 			pkey_reg, __read_pkey_reg());
 }
 

@@ -113,7 +114,7 @@ static inline void write_pkey_reg(unsigned int pkey_reg)
  */
 static inline void __pkey_access_allow(int pkey, int do_allow)
 {
-	unsigned int pkey_reg = read_pkey_reg();
+	pkey_reg_t pkey_reg = read_pkey_reg();
 	int bit = pkey * 2;
 
 	if (do_allow)

@@ -121,13 +122,13 @@ static inline void __pkey_access_allow(int pkey, int do_allow)
 	else
 		pkey_reg |= (1<<bit);
 
-	dprintf4("pkey_reg now: %08x\n", read_pkey_reg());
+	dprintf4("pkey_reg now: "PKEY_REG_FMT"\n", read_pkey_reg());
 	write_pkey_reg(pkey_reg);
 }
 
 static inline void __pkey_write_allow(int pkey, int do_allow_write)
 {
-	long pkey_reg = read_pkey_reg();
+	pkey_reg_t pkey_reg = read_pkey_reg();
 	int bit = pkey * 2 + 1;
 
 	if (do_allow_write)

@@ -136,7 +137,7 @@ static inline void __pkey_write_allow(int pkey, int do_allow_write)
 		pkey_reg |= (1<<bit);
 
 	write_pkey_reg(pkey_reg);
-	dprintf4("pkey_reg now: %08x\n", read_pkey_reg());
+	dprintf4("pkey_reg now: "PKEY_REG_FMT"\n", read_pkey_reg());
 }
 
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))

index 2f04ade..5f40901 100644
@@ -46,6 +46,8 @@
 #define HPAGE_SIZE		(1UL<<21)
 #define PAGE_SIZE		4096
 #define MB			(1<<20)
+#define pkey_reg_t		u32
+#define PKEY_REG_FMT		"%016x"
 
 static inline void __page_o_noops(void)
 {

@@ -53,11 +55,11 @@ static inline void __page_o_noops(void)
 	asm(".rept 512 ; nopl 0x7eeeeeee(%eax) ; .endr");
 }
 
-static inline unsigned int __read_pkey_reg(void)
+static inline pkey_reg_t __read_pkey_reg(void)
 {
 	unsigned int eax, edx;
 	unsigned int ecx = 0;
-	unsigned int pkey_reg;
+	pkey_reg_t pkey_reg;
 
 	asm volatile(".byte 0x0f,0x01,0xee\n\t"
 		     : "=a" (eax), "=d" (edx)

@@ -66,13 +68,13 @@ static inline unsigned int __read_pkey_reg(void)
 	return pkey_reg;
 }
 
-static inline void __write_pkey_reg(unsigned int pkey_reg)
+static inline void __write_pkey_reg(pkey_reg_t pkey_reg)
 {
-	unsigned int eax = pkey_reg;
-	unsigned int ecx = 0;
-	unsigned int edx = 0;
+	pkey_reg_t eax = pkey_reg;
+	pkey_reg_t ecx = 0;
+	pkey_reg_t edx = 0;
 
-	dprintf4("%s() changing %08x to %08x\n", __func__,
+	dprintf4("%s() changing "PKEY_REG_FMT" to "PKEY_REG_FMT"\n", __func__,
 			__read_pkey_reg(), pkey_reg);
 	asm volatile(".byte 0x0f,0x01,0xef\n\t"
 		     : : "a" (eax), "c" (ecx), "d" (edx));

265 lines not on this page · raw message

index 2a1a024..ada0146 100644
@@ -80,6 +80,35 @@ static inline void sigsafe_printf(const char *format, ...)
 #error Architecture not supported
 #endif /* arch */
 
+static inline pkey_reg_t clear_pkey_flags(int pkey, pkey_reg_t flags)
+{
+	u32 shift = pkey_bit_position(pkey);
+
+	return ~(flags << shift);
+}
+
+/*
+ * Takes pkey flags and puts them at the right bit position for the given key so
+ * that the result can be ORed into the register.
+ */
+static inline pkey_reg_t left_shift_bits(int pkey, pkey_reg_t bits)
+{
+	u32 shift = pkey_bit_position(pkey);
+
+	return (bits << shift);
+}
+
+/*
+ * Takes pkey register values and puts the flags for the given pkey at the least
+ * significant bits of the returned value.
+ */
+static inline pkey_reg_t right_shift_bits(int pkey, pkey_reg_t bits)
+{
+	u32 shift = pkey_bit_position(pkey);
+
+	return (bits >> shift);
+}
+
 extern pkey_reg_t shadow_pkey_reg;
 
 static inline pkey_reg_t _read_pkey_reg(int line)

index 5f40901..2b3780d 100644
@@ -49,6 +49,11 @@
 #define pkey_reg_t		u32
 #define PKEY_REG_FMT		"%016x"
 
+static inline u32 pkey_bit_position(int pkey)
+{
+	return pkey * PKEY_BITS_PER_PKEY;
+}
+
 static inline void __page_o_noops(void)
 {
 	/* 8-bytes of instruction * 512 bytes = 1 page */

index d95fe20..fb7dd32 100644
@@ -342,7 +342,7 @@ static u32 hw_pkey_get(int pkey, unsigned long flags)
 			__func__, pkey, flags, 0, 0);
 	dprintf2("%s() raw pkey_reg: "PKEY_REG_FMT"\n", __func__, pkey_reg);
 
-	shifted_pkey_reg = (pkey_reg >> (pkey * PKEY_BITS_PER_PKEY));
+	shifted_pkey_reg = right_shift_bits(pkey, pkey_reg);
 	dprintf2("%s() shifted_pkey_reg: "PKEY_REG_FMT"\n", __func__,
 			shifted_pkey_reg);
 	masked_pkey_reg = shifted_pkey_reg & mask;

@@ -366,9 +366,9 @@ static int hw_pkey_set(int pkey, unsigned long rights, unsigned long flags)
 	/* copy old pkey_reg */
 	new_pkey_reg = old_pkey_reg;
 	/* mask out bits from pkey in old value: */
-	new_pkey_reg &= ~(mask << (pkey * PKEY_BITS_PER_PKEY));
+	new_pkey_reg &= clear_pkey_flags(pkey, mask);
 	/* OR in new bits for pkey: */
-	new_pkey_reg |= (rights << (pkey * PKEY_BITS_PER_PKEY));
+	new_pkey_reg |= left_shift_bits(pkey, rights);
 
 	__write_pkey_reg(new_pkey_reg);
 

@@ -402,7 +402,7 @@ void pkey_disable_set(int pkey, int flags)
 	ret = hw_pkey_set(pkey, pkey_rights, syscall_flags);
 	assert(!ret);
 	/*pkey_reg and flags have the same format */
-	shadow_pkey_reg |= flags << (pkey * 2);
+	shadow_pkey_reg |= left_shift_bits(pkey, flags);
 	dprintf1("%s(%d) shadow: 0x"PKEY_REG_FMT"\n",
 		__func__, pkey, shadow_pkey_reg);
 

@@ -436,7 +436,7 @@ void pkey_disable_clear(int pkey, int flags)
 	pkey_rights |= flags;
 
 	ret = hw_pkey_set(pkey, pkey_rights, 0);
-	shadow_pkey_reg &= ~(flags << (pkey * 2));
+	shadow_pkey_reg &= clear_pkey_flags(pkey, flags);
 	pkey_assert(ret >= 0);
 
 	pkey_rights = hw_pkey_get(pkey, syscall_flags);

@@ -494,6 +494,21 @@ int sys_pkey_alloc(unsigned long flags, unsigned long init_val)
 	return ret;
 }
 
+void pkey_setup_shadow(void)
+{
+	shadow_pkey_reg = __read_pkey_reg();
+}
+
+void pkey_reset_shadow(u32 key)
+{
+	shadow_pkey_reg &= clear_pkey_flags(key, 0x3);
+}
+
+void pkey_set_shadow(u32 key, u64 init_val)
+{
+	shadow_pkey_reg |=  left_shift_bits(key, init_val);
+}
+
 int alloc_pkey(void)
 {
 	int ret;

@@ -512,7 +527,7 @@ int alloc_pkey(void)
 			shadow_pkey_reg);
 	if (ret) {
 		/* clear both the bits: */
-		shadow_pkey_reg &= ~(0x3      << (ret * 2));
+		pkey_reset_shadow(ret);
 		dprintf4("%s()::%d, ret: %d pkey_reg: 0x"PKEY_REG_FMT
 				" shadow: 0x"PKEY_REG_FMT"\n",
 				__func__,

@@ -522,7 +537,7 @@ int alloc_pkey(void)
 		 * move the new state in from init_val
 		 * (remember, we cheated and init_val == pkey_reg format)
 		 */
-		shadow_pkey_reg |=  (init_val << (ret * 2));
+		pkey_set_shadow(ret, init_val);
 	}
 	dprintf4("%s()::%d, ret: %d pkey_reg: 0x"PKEY_REG_FMT
 			" shadow: 0x"PKEY_REG_FMT"\n",

@@ -1403,11 +1418,6 @@ void run_tests_once(void)
 	iteration_nr++;
 }
 
-void pkey_setup_shadow(void)
-{
-	shadow_pkey_reg = __read_pkey_reg();
-}
-
 int main(void)
 {
 	int nr_iterations = 22;

index fb7dd32..2dd94c3 100644
@@ -415,7 +415,7 @@ void pkey_disable_set(int pkey, int flags)
 	dprintf1("%s(%d) pkey_reg: 0x"PKEY_REG_FMT"\n",
 		__func__, pkey, read_pkey_reg());
 	if (flags)
-		pkey_assert(read_pkey_reg() > orig_pkey_reg);
+		pkey_assert(read_pkey_reg() >= orig_pkey_reg);
 	dprintf1("END<---%s(%d, 0x%x)\n", __func__,
 		pkey, flags);
 }

index 2dd94c3..8fa4f74 100644
@@ -433,7 +433,7 @@ void pkey_disable_clear(int pkey, int flags)
 			pkey, pkey, pkey_rights);
 	pkey_assert(pkey_rights >= 0);
 
-	pkey_rights |= flags;
+	pkey_rights &= ~flags;
 
 	ret = hw_pkey_set(pkey, pkey_rights, 0);
 	shadow_pkey_reg &= clear_pkey_flags(pkey, flags);

@@ -446,7 +446,7 @@ void pkey_disable_clear(int pkey, int flags)
 	dprintf1("%s(%d) pkey_reg: 0x"PKEY_REG_FMT"\n", __func__,
 			pkey, read_pkey_reg());
 	if (flags)
-		assert(read_pkey_reg() > orig_pkey_reg);
+		assert(read_pkey_reg() <= orig_pkey_reg);
 }
 
 void pkey_write_allow(int pkey)

index 8fa4f74..2565b4c 100644
@@ -24,6 +24,7 @@
 #define _GNU_SOURCE
 #include <errno.h>
 #include <linux/futex.h>
+#include <time.h>
 #include <sys/time.h>
 #include <sys/syscall.h>
 #include <string.h>

@@ -573,13 +574,15 @@ int alloc_random_pkey(void)
 	int alloced_pkeys[NR_PKEYS];
 	int nr_alloced = 0;
 	int random_index;
+
 	memset(alloced_pkeys, 0, sizeof(alloced_pkeys));
+	srand((unsigned int)time(NULL));
 
 	/* allocate every possible key and make a note of which ones we got */
 	max_nr_pkey_allocs = NR_PKEYS;
-	max_nr_pkey_allocs = 1;
 	for (i = 0; i < max_nr_pkey_allocs; i++) {
 		int new_pkey = alloc_pkey();
+
 		if (new_pkey < 0)
 			break;
 		alloced_pkeys[nr_alloced++] = new_pkey;

@@ -595,6 +598,7 @@ int alloc_random_pkey(void)
 	/* go through the allocated ones that we did not want and free them */
 	for (i = 0; i < nr_alloced; i++) {
 		int free_ret;
+
 		if (!alloced_pkeys[i])
 			continue;
 		free_ret = sys_pkey_free(alloced_pkeys[i]);

index ada0146..52a1152 100644
@@ -179,4 +179,14 @@ static inline void __pkey_write_allow(int pkey, int do_allow_write)
 #define __stringify_1(x...)     #x
 #define __stringify(x...)       __stringify_1(x)
 
+static inline int open_hugepage_file(int flag)
+{
+	return open(HUGEPAGE_FILE, flag);
+}
+
+static inline int get_start_key(void)
+{
+	return 1;
+}
+
 #endif /* _PKEYS_HELPER_H */

index 2b3780d..d5fa299 100644
@@ -48,6 +48,7 @@
 #define MB			(1<<20)
 #define pkey_reg_t		u32
 #define PKEY_REG_FMT		"%016x"
+#define HUGEPAGE_FILE		"/sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages"
 
 static inline u32 pkey_bit_position(int pkey)
 {

index 2565b4c..2e448e0 100644
@@ -788,7 +788,7 @@ void setup_hugetlbfs(void)
 	 * Now go make sure that we got the pages and that they
 	 * are 2M pages.  Someone might have made 1G the default.
 	 */
-	fd = open("/sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages", O_RDONLY);
+	fd = open_hugepage_file(O_RDONLY);
 	if (fd < 0) {
 		perror("opening sysfs 2M hugetlb config");
 		return;

@@ -1075,10 +1075,10 @@ void test_kernel_gup_write_to_write_disabled_region(int *ptr, u16 pkey)
 void test_pkey_syscalls_on_non_allocated_pkey(int *ptr, u16 pkey)
 {
 	int err;
-	int i;
+	int i = get_start_key();
 
 	/* Note: 0 is the default pkey, so don't mess with it */
-	for (i = 1; i < NR_PKEYS; i++) {
+	for (; i < NR_PKEYS; i++) {
 		if (pkey == i)
 			continue;
 

index 2e448e0..f50cce8 100644
@@ -913,10 +913,10 @@ void expected_pkey_fault(int pkey)
 		pkey_assert(last_si_pkey == pkey);
 
 	/*
-	 * The signal handler shold have cleared out PKEY register to let the
+	 * The signal handler should have cleared out pkey-register to let the
 	 * test program continue.  We now have to restore it.
 	 */
-	if (__read_pkey_reg() != 0)
+	if (__read_pkey_reg() != shadow_pkey_reg)
 		pkey_assert(0);
 
 	__write_pkey_reg(shadow_pkey_reg);

index f50cce8..304f74f 100644
@@ -4,7 +4,7 @@
  *
  * There are examples in here of:
  *  * how to set protection keys on memory
- *  * how to set/clear bits in pkey registers (the rights register)
+ *  * how to set/clear bits in Protection Key registers (the rights register)
  *  * how to handle SEGV_PKUERR signals and extract pkey-relevant
  *    information from the siginfo
  *

@@ -13,13 +13,18 @@
  *	prefault pages in at malloc, or not
  *	protect MPX bounds tables with protection keys?
  *	make sure VMA splitting/merging is working correctly
- *	OOMs can destroy mm->mmap (see exit_mmap()), so make sure it is immune to pkeys
- *	look for pkey "leaks" where it is still set on a VMA but "freed" back to the kernel
- *	do a plain mprotect() to a mprotect_pkey() area and make sure the pkey sticks
+ *	OOMs can destroy mm->mmap (see exit_mmap()),
+ *			so make sure it is immune to pkeys
+ *	look for pkey "leaks" where it is still set on a VMA
+ *			 but "freed" back to the kernel
+ *	do a plain mprotect() to a mprotect_pkey() area and make
+ *			 sure the pkey sticks
  *
  * Compile like this:
- *	gcc      -o protection_keys    -O2 -g -std=gnu99 -pthread -Wall protection_keys.c -lrt -ldl -lm
- *	gcc -m32 -o protection_keys_32 -O2 -g -std=gnu99 -pthread -Wall protection_keys.c -lrt -ldl -lm
+ *	gcc      -o protection_keys    -O2 -g -std=gnu99
+ *			 -pthread -Wall protection_keys.c -lrt -ldl -lm
+ *	gcc -m32 -o protection_keys_32 -O2 -g -std=gnu99
+ *			 -pthread -Wall protection_keys.c -lrt -ldl -lm
  */
 #define _GNU_SOURCE
 #include <errno.h>

@@ -263,10 +268,12 @@ void signal_handler(int signum, siginfo_t *si, void *vucontext)
 			__read_pkey_reg());
 	dprintf1("pkey from siginfo: %jx\n", siginfo_pkey);
 	*(u64 *)pkey_reg_ptr = 0x00000000;
-	dprintf1("WARNING: set PRKU=0 to allow faulting instruction to continue\n");
+	dprintf1("WARNING: set PKEY_REG=0 to allow faulting instruction "
+			"to continue\n");
 	pkey_faults++;
 	dprintf1("<<<<==================================================\n");
 	dprint_in_signal = 0;
+	return;
 }
 
 int wait_all_children(void)

@@ -384,7 +391,7 @@ void pkey_disable_set(int pkey, int flags)
 {
 	unsigned long syscall_flags = 0;
 	int ret;
-	int pkey_rights;
+	u32 pkey_rights;
 	pkey_reg_t orig_pkey_reg = read_pkey_reg();
 
 	dprintf1("START->%s(%d, 0x%x)\n", __func__,

@@ -487,9 +494,10 @@ int sys_mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
 	return sret;
 }
 
-int sys_pkey_alloc(unsigned long flags, unsigned long init_val)
+int sys_pkey_alloc(unsigned long flags, u64 init_val)
 {
 	int ret = syscall(SYS_pkey_alloc, flags, init_val);
+
 	dprintf1("%s(flags=%lx, init_val=%lx) syscall ret: %d errno: %d\n",
 			__func__, flags, init_val, ret, errno);
 	return ret;

@@ -513,7 +521,7 @@ void pkey_set_shadow(u32 key, u64 init_val)
 int alloc_pkey(void)
 {
 	int ret;
-	unsigned long init_val = 0x0;
+	u64 init_val = 0x0;
 
 	dprintf1("%s()::%d, pkey_reg: "PKEY_REG_FMT" shadow: "PKEY_REG_FMT"\n",
 			__func__, __LINE__, __read_pkey_reg(), shadow_pkey_reg);

@@ -669,7 +677,9 @@ void record_pkey_malloc(void *ptr, long size, int prot)
 		/* every record is full */
 		size_t old_nr_records = nr_pkey_malloc_records;
 		size_t new_nr_records = (nr_pkey_malloc_records * 2 + 1);
-		size_t new_size = new_nr_records * sizeof(struct pkey_malloc_record);
+		size_t new_size = new_nr_records *
+				sizeof(struct pkey_malloc_record);
+
 		dprintf2("new_nr_records: %zd\n", new_nr_records);
 		dprintf2("new_size: %zd\n", new_size);
 		pkey_malloc_records = realloc(pkey_malloc_records, new_size);

@@ -695,9 +705,11 @@ void free_pkey_malloc(void *ptr)
 {
 	long i;
 	int ret;
+
 	dprintf3("%s(%p)\n", __func__, ptr);
 	for (i = 0; i < nr_pkey_malloc_records; i++) {
 		struct pkey_malloc_record *rec = &pkey_malloc_records[i];
+
 		dprintf4("looking for ptr %p at record[%ld/%p]: {%p, %ld}\n",
 				ptr, i, rec, rec->ptr, rec->size);
 		if ((ptr <  rec->ptr) ||

@@ -778,11 +790,13 @@ void setup_hugetlbfs(void)
 	char buf[] = "123";
 
 	if (geteuid() != 0) {
-		fprintf(stderr, "WARNING: not run as root, can not do hugetlb test\n");
+		fprintf(stderr,
+			"WARNING: not run as root, can not do hugetlb test\n");
 		return;
 	}
 
-	cat_into_file(__stringify(GET_NR_HUGE_PAGES), "/proc/sys/vm/nr_hugepages");
+	cat_into_file(__stringify(GET_NR_HUGE_PAGES),
+				"/proc/sys/vm/nr_hugepages");
 
 	/*
 	 * Now go make sure that we got the pages and that they

@@ -803,7 +817,8 @@ void setup_hugetlbfs(void)
 	}
 
 	if (atoi(buf) != GET_NR_HUGE_PAGES) {
-		fprintf(stderr, "could not confirm 2M pages, got: '%s' expected %d\n",
+		fprintf(stderr, "could not confirm 2M pages, got:"
+			       " '%s' expected %d\n",
 			buf, GET_NR_HUGE_PAGES);
 		return;
 	}

@@ -945,6 +960,7 @@ void __save_test_fd(int fd)
 int get_test_read_fd(void)
 {
 	int test_fd = open("/etc/passwd", O_RDONLY);
+
 	__save_test_fd(test_fd);
 	return test_fd;
 }

@@ -986,7 +1002,8 @@ void test_read_of_access_disabled_region(int *ptr, u16 pkey)
 {
 	int ptr_contents;
 
-	dprintf1("disabling access to PKEY[%02d], doing read @ %p\n", pkey, ptr);
+	dprintf1("disabling access to PKEY[%02d], doing read @ %p\n",
+			 pkey, ptr);
 	read_pkey_reg();
 	pkey_access_deny(pkey);
 	ptr_contents = read_ptr(ptr);

@@ -1108,13 +1125,14 @@ void test_pkey_syscalls_bad_args(int *ptr, u16 pkey)
 /* Assumes that all pkeys other than 'pkey' are unallocated */
 void test_pkey_alloc_exhaust(int *ptr, u16 pkey)
 {
-	int err;
+	int err = 0;
 	int allocated_pkeys[NR_PKEYS] = {0};
 	int nr_allocated_pkeys = 0;
 	int i;
 
 	for (i = 0; i < NR_PKEYS*2; i++) {
 		int new_pkey;
+
 		dprintf1("%s() alloc loop: %d\n", __func__, i);
 		new_pkey = alloc_pkey();
 		dprintf4("%s()::%d, err: %d pkey_reg: 0x"PKEY_REG_FMT

@@ -1122,9 +1140,11 @@ void test_pkey_alloc_exhaust(int *ptr, u16 pkey)
 				__func__, __LINE__, err, __read_pkey_reg(),
 				shadow_pkey_reg);
 		read_pkey_reg(); /* for shadow checking */
-		dprintf2("%s() errno: %d ENOSPC: %d\n", __func__, errno, ENOSPC);
+		dprintf2("%s() errno: %d ENOSPC: %d\n",
+				__func__, errno, ENOSPC);
 		if ((new_pkey == -1) && (errno == ENOSPC)) {
-			dprintf2("%s() failed to allocate pkey after %d tries\n",
+			dprintf2("%s() failed to allocate pkey "
+					"after %d tries\n",
 				__func__, nr_allocated_pkeys);
 			break;
 		}

@@ -1416,7 +1436,8 @@ void run_tests_once(void)
 		tracing_off();
 		close_test_fds();
 
-		printf("test %2d PASSED (iteration %d)\n", test_nr, iteration_nr);
+		printf("test %2d PASSED (iteration %d)\n",
+				test_nr, iteration_nr);
 		dprintf1("======================\n\n");
 	}
 	iteration_nr++;

@@ -1428,7 +1449,7 @@ int main(void)
 
 	setup_handlers();
 
-	printf("has pku: %d\n", cpu_has_pku());
+	printf("has pkey: %d\n", cpu_has_pku());
 
 	if (!cpu_has_pku()) {
 		int size = PAGE_SIZE;

@@ -1436,7 +1457,8 @@ int main(void)
 
 		printf("running PKEY tests for unsupported CPU/OS\n");
 
-		ptr  = mmap(NULL, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+		ptr  = mmap(NULL, size, PROT_NONE,
+				MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
 		assert(ptr != (void *)-1);
 		test_mprotect_pkey_on_unsupported_cpu(ptr, 1);
 		exit(0);

index 52a1152..321bbbd 100644
@@ -74,8 +74,13 @@ static inline void sigsafe_printf(const char *format, ...)
 	}					\
 } while (0)
 
+__attribute__((noinline)) int read_ptr(int *ptr);
+void expected_pkey_fault(int pkey);
+
 #if defined(__i386__) || defined(__x86_64__) /* arch */
 #include "pkey-x86.h"
+#elif defined(__powerpc64__) /* arch */
+#include "pkey-powerpc.h"
 #else /* arch */
 #error Architecture not supported
 #endif /* arch */

@@ -186,7 +191,16 @@ static inline int open_hugepage_file(int flag)
 
 static inline int get_start_key(void)
 {
-	return 1;
+	return 0;
+}
+
+static inline u32 *siginfo_get_pkey_ptr(siginfo_t *si)
+{
+#ifdef si_pkey
+	return &si->si_pkey;
+#else
+	return (u32 *)(((u8 *)si) + si_pkey_offset);
+#endif
 }
 
 #endif /* _PKEYS_HELPER_H */

93 lines not on this page · raw message

index d5fa299..f5d0ff2 100644
@@ -42,6 +42,7 @@
 #endif
 
 #define NR_PKEYS		16
+#define NR_RESERVED_PKEYS	2 /* pkey-0 and exec-only-pkey */
 #define PKEY_BITS_PER_PKEY	2
 #define HPAGE_SIZE		(1UL<<21)
 #define PAGE_SIZE		4096

@@ -161,4 +162,18 @@ int pkey_reg_xstate_offset(void)
 	return xstate_offset;
 }
 
+static inline int arch_reserved_keys(void)
+{
+	return NR_RESERVED_PKEYS;
+}
+
+void expect_fault_on_read_execonly_key(void *p1, int pkey)
+{
+	int ptr_contents;
+
+	ptr_contents = read_ptr(p1);
+	dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents);
+	expected_pkey_fault(pkey);
+}
+
 #endif /* _PKEYS_X86_H */

119 lines not on this page · raw message

index 321bbbd..288ccff 100644
@@ -76,6 +76,8 @@ static inline void sigsafe_printf(const char *format, ...)
 
 __attribute__((noinline)) int read_ptr(int *ptr);
 void expected_pkey_fault(int pkey);
+int sys_pkey_alloc(unsigned long flags, u64 init_val);
+int sys_pkey_free(unsigned long pkey);
 
 #if defined(__i386__) || defined(__x86_64__) /* arch */
 #include "pkey-x86.h"

index b0d1abe..b649e85 100644
@@ -64,9 +64,19 @@ static inline void __write_pkey_reg(pkey_reg_t pkey_reg)
 			pkey_reg);
 }
 
-static inline int cpu_has_pku(void)
+static inline bool is_pkey_supported(void)
 {
-	return 1;
+	/*
+	 * No simple way to determine this.
+	 * Lets try allocating a key and see if it succeeds.
+	 */
+	int ret = sys_pkey_alloc(0, 0);
+
+	if (ret > 0) {
+		sys_pkey_free(ret);
+		return true;
+	}
+	return false;
 }
 
 static inline int arch_reserved_keys(void)

index f5d0ff2..887acf2 100644
@@ -105,7 +105,7 @@ static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
 #define X86_FEATURE_PKU        (1<<3) /* Protection Keys for Userspace */
 #define X86_FEATURE_OSPKE      (1<<4) /* OS Protection Keys Enable */
 
-static inline int cpu_has_pku(void)
+static inline bool is_pkey_supported(void)
 {
 	unsigned int eax;
 	unsigned int ebx;

@@ -118,13 +118,13 @@ static inline int cpu_has_pku(void)
 
 	if (!(ecx & X86_FEATURE_PKU)) {
 		dprintf2("cpu does not have PKU\n");
-		return 0;
+		return false;
 	}
 	if (!(ecx & X86_FEATURE_OSPKE)) {
 		dprintf2("cpu does not have OSPKE\n");
-		return 0;
+		return false;
 	}
-	return 1;
+	return true;
 }
 
 #define XSTATE_PKEY_BIT	(9)

index 18e1bb7..d27fa5e 100644
@@ -1389,8 +1389,8 @@ void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
 	int size = PAGE_SIZE;
 	int sret;
 
-	if (cpu_has_pku()) {
-		dprintf1("SKIP: %s: no CPU support\n", __func__);
+	if (is_pkey_supported()) {
+		dprintf1("SKIP: %s: no CPU/kernel support\n", __func__);
 		return;
 	}
 

@@ -1454,12 +1454,13 @@ void run_tests_once(void)
 int main(void)
 {
 	int nr_iterations = 22;
+	int pkey_supported = is_pkey_supported();
 
 	setup_handlers();
 
-	printf("has pkey: %d\n", cpu_has_pku());
+	printf("has pkey: %s\n", pkey_supported ? "Yes" : "No");
 
-	if (!cpu_has_pku()) {
+	if (!pkey_supported) {
 		int size = PAGE_SIZE;
 		int *ptr;
 

index d27fa5e..67d841e 100644
@@ -1171,15 +1171,11 @@ void test_pkey_alloc_exhaust(int *ptr, u16 pkey)
 	pkey_assert(i < NR_PKEYS*2);
 
 	/*
-	 * There are 16 pkeys supported in hardware.  Three are
-	 * allocated by the time we get here:
-	 *   1. The default key (0)
-	 *   2. One possibly consumed by an execute-only mapping.
-	 *   3. One allocated by the test code and passed in via
-	 *      'pkey' to this function.
-	 * Ensure that we can allocate at least another 13 (16-3).
+	 * There are NR_PKEYS pkeys supported in hardware. arch_reserved_keys()
+	 * are reserved. And one key is allocated by the test code and passed
+	 * in via 'pkey' to this function.
 	 */
-	pkey_assert(i >= NR_PKEYS-3);
+	pkey_assert(i >= (NR_PKEYS-arch_reserved_keys()-1));
 
 	for (i = 0; i < nr_allocated_pkeys; i++) {
 		err = sys_pkey_free(allocated_pkeys[i]);

index 67d841e..d41b2dc 100644
@@ -1020,6 +1020,24 @@ void test_read_of_access_disabled_region(int *ptr, u16 pkey)
 	dprintf1("*ptr: %d\n", ptr_contents);
 	expected_pkey_fault(pkey);
 }
+
+void test_read_of_access_disabled_region_with_page_already_mapped(int *ptr,
+		u16 pkey)
+{
+	int ptr_contents;
+
+	dprintf1("disabling access to PKEY[%02d], doing read @ %p\n",
+				pkey, ptr);
+	ptr_contents = read_ptr(ptr);
+	dprintf1("reading ptr before disabling the read : %d\n",
+			ptr_contents);
+	read_pkey_reg();
+	pkey_access_deny(pkey);
+	ptr_contents = read_ptr(ptr);
+	dprintf1("*ptr: %d\n", ptr_contents);
+	expected_pkey_fault(pkey);
+}
+
 void test_write_of_write_disabled_region(int *ptr, u16 pkey)
 {
 	dprintf1("disabling write access to PKEY[%02d], doing write\n", pkey);

@@ -1397,6 +1415,7 @@ void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
 void (*pkey_tests[])(int *ptr, u16 pkey) = {
 	test_read_of_write_disabled_region,
 	test_read_of_access_disabled_region,
+	test_read_of_access_disabled_region_with_page_already_mapped,
 	test_write_of_write_disabled_region,
 	test_write_of_access_disabled_region,
 	test_kernel_write_of_access_disabled_region,

index d41b2dc..59f6f33 100644
@@ -1038,6 +1038,17 @@ void test_read_of_access_disabled_region_with_page_already_mapped(int *ptr,
 	expected_pkey_fault(pkey);
 }
 
+void test_write_of_write_disabled_region_with_page_already_mapped(int *ptr,
+		u16 pkey)
+{
+	*ptr = __LINE__;
+	dprintf1("disabling write access; after accessing the page, "
+		"to PKEY[%02d], doing write\n", pkey);
+	pkey_write_deny(pkey);
+	*ptr = __LINE__;
+	expected_pkey_fault(pkey);
+}
+
 void test_write_of_write_disabled_region(int *ptr, u16 pkey)
 {
 	dprintf1("disabling write access to PKEY[%02d], doing write\n", pkey);

@@ -1417,6 +1428,7 @@ void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
 	test_read_of_access_disabled_region,
 	test_read_of_access_disabled_region_with_page_already_mapped,
 	test_write_of_write_disabled_region,
+	test_write_of_write_disabled_region_with_page_already_mapped,
 	test_write_of_access_disabled_region,
 	test_kernel_write_of_access_disabled_region,
 	test_kernel_write_of_write_disabled_region,

index 59f6f33..8a6afdd 100644
@@ -1063,6 +1063,18 @@ void test_write_of_access_disabled_region(int *ptr, u16 pkey)
 	*ptr = __LINE__;
 	expected_pkey_fault(pkey);
 }
+
+void test_write_of_access_disabled_region_with_page_already_mapped(int *ptr,
+			u16 pkey)
+{
+	*ptr = __LINE__;
+	dprintf1("disabling access; after accessing the page, "
+		" to PKEY[%02d], doing write\n", pkey);
+	pkey_access_deny(pkey);
+	*ptr = __LINE__;
+	expected_pkey_fault(pkey);
+}
+
 void test_kernel_write_of_access_disabled_region(int *ptr, u16 pkey)
 {
 	int ret;

@@ -1430,6 +1442,7 @@ void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
 	test_write_of_write_disabled_region,
 	test_write_of_write_disabled_region_with_page_already_mapped,
 	test_write_of_access_disabled_region,
+	test_write_of_access_disabled_region_with_page_already_mapped,
 	test_kernel_write_of_access_disabled_region,
 	test_kernel_write_of_write_disabled_region,
 	test_kernel_gup_of_access_disabled_region,

index 8a6afdd..ea3cf04 100644
@@ -1476,8 +1476,13 @@ void run_tests_once(void)
 		pkey_tests[test_nr](ptr, pkey);
 		dprintf1("freeing test memory: %p\n", ptr);
 		free_pkey_malloc(ptr);
+
+		/* restore the permission on the key after use */
+		pkey_access_allow(pkey);
+		pkey_write_allow(pkey);
 		sys_pkey_free(pkey);
 
+
 		dprintf1("pkey_faults: %d\n", pkey_faults);
 		dprintf1("orig_pkey_faults: %d\n", orig_pkey_faults);
 

index 288ccff..a00eee6 100644
@@ -28,6 +28,9 @@
 extern int dprint_in_signal;
 extern char dprint_in_signal_buffer[DPRINT_IN_SIGNAL_BUF_SIZE];
 
+extern int test_nr;
+extern int iteration_nr;
+
 #ifdef __GNUC__
 __attribute__((format(printf, 1, 2)))
 #endif

@@ -78,6 +81,9 @@ static inline void sigsafe_printf(const char *format, ...)
 void expected_pkey_fault(int pkey);
 int sys_pkey_alloc(unsigned long flags, u64 init_val);
 int sys_pkey_free(unsigned long pkey);
+int mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
+		unsigned long pkey);
+void record_pkey_malloc(void *ptr, long size, int prot);
 
 #if defined(__i386__) || defined(__x86_64__) /* arch */
 #include "pkey-x86.h"

index b649e85..ab60f74 100644
@@ -100,4 +100,29 @@ void expect_fault_on_read_execonly_key(void *p1, int pkey)
 /* 8-bytes of instruction * 16384bytes = 1 page */
 #define __page_o_noops() asm(".rept 16384 ; nop; .endr")
 
+void *malloc_pkey_with_mprotect_subpage(long size, int prot, u16 pkey)
+{
+	void *ptr;
+	int ret;
+
+	dprintf1("doing %s(size=%ld, prot=0x%x, pkey=%d)\n", __func__,
+			size, prot, pkey);
+	pkey_assert(pkey < NR_PKEYS);
+	ptr = mmap(NULL, size, prot, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+	pkey_assert(ptr != (void *)-1);
+
+	ret = syscall(__NR_subpage_prot, ptr, size, NULL);
+	if (ret) {
+		perror("subpage_perm");
+		return PTR_ERR_ENOTSUP;
+	}
+
+	ret = mprotect_pkey((void *)ptr, PAGE_SIZE, prot, pkey);
+	pkey_assert(!ret);
+	record_pkey_malloc(ptr, size, prot);
+
+	dprintf1("%s() for pkey %d @ %p\n", __func__, pkey, ptr);
+	return ptr;
+}
+
 #endif /* _PKEYS_POWERPC_H */

index 887acf2..a7e4648 100644
@@ -176,4 +176,9 @@ void expect_fault_on_read_execonly_key(void *p1, int pkey)
 	expected_pkey_fault(pkey);
 }
 
+void *malloc_pkey_with_mprotect_subpage(long size, int prot, u16 pkey)
+{
+	return PTR_ERR_ENOTSUP;
+}
+
 #endif /* _PKEYS_X86_H */

index ea3cf04..569faf1 100644
@@ -883,6 +883,7 @@ void setup_hugetlbfs(void)
 void *(*pkey_malloc[])(long size, int prot, u16 pkey) = {
 
 	malloc_pkey_with_mprotect,
+	malloc_pkey_with_mprotect_subpage,
 	malloc_pkey_anon_huge,
 	malloc_pkey_hugetlb
 /* can not do direct with the pkey_mprotect() API:

index 569faf1..156b449 100644
@@ -999,6 +999,67 @@ void close_test_fds(void)
 	return *ptr;
 }
 
+void test_pkey_alloc_free_attach_pkey0(int *ptr, u16 pkey)
+{
+	int i, err;
+	int max_nr_pkey_allocs;
+	int alloced_pkeys[NR_PKEYS];
+	int nr_alloced = 0;
+	int newpkey;
+	long size;
+
+	assert(pkey_last_malloc_record);
+	size = pkey_last_malloc_record->size;
+	/*
+	 * This is a bit of a hack.  But mprotect() requires
+	 * huge-page-aligned sizes when operating on hugetlbfs.
+	 * So, make sure that we use something that's a multiple
+	 * of a huge page when we can.
+	 */
+	if (size >= HPAGE_SIZE)
+		size = HPAGE_SIZE;
+
+
+	/* allocate every possible key and make sure key-0 never got allocated */
+	max_nr_pkey_allocs = NR_PKEYS;
+	for (i = 0; i < max_nr_pkey_allocs; i++) {
+		int new_pkey = alloc_pkey();
+		assert(new_pkey != 0);
+
+		if (new_pkey < 0)
+			break;
+		alloced_pkeys[nr_alloced++] = new_pkey;
+	}
+	/* free all the allocated keys */
+	for (i = 0; i < nr_alloced; i++) {
+		int free_ret;
+
+		if (!alloced_pkeys[i])
+			continue;
+		free_ret = sys_pkey_free(alloced_pkeys[i]);
+		pkey_assert(!free_ret);
+	}
+
+	/* attach key-0 in various modes */
+	err = sys_mprotect_pkey(ptr, size, PROT_READ, 0);
+	pkey_assert(!err);
+	err = sys_mprotect_pkey(ptr, size, PROT_WRITE, 0);
+	pkey_assert(!err);
+	err = sys_mprotect_pkey(ptr, size, PROT_EXEC, 0);
+	pkey_assert(!err);
+	err = sys_mprotect_pkey(ptr, size, PROT_READ|PROT_WRITE, 0);
+	pkey_assert(!err);
+	err = sys_mprotect_pkey(ptr, size, PROT_READ|PROT_WRITE|PROT_EXEC, 0);
+	pkey_assert(!err);
+
+	/* free key-0 */
+	err = sys_pkey_free(0);
+	pkey_assert(!err);
+
+	newpkey = sys_pkey_alloc(0, 0x0);
+	assert(newpkey == 0);
+}
+
 void test_read_of_write_disabled_region(int *ptr, u16 pkey)
 {
 	int ptr_contents;

@@ -1144,10 +1205,10 @@ void test_kernel_gup_write_to_write_disabled_region(int *ptr, u16 pkey)
 void test_pkey_syscalls_on_non_allocated_pkey(int *ptr, u16 pkey)
 {
 	int err;
-	int i = get_start_key();
+	int i;
 
 	/* Note: 0 is the default pkey, so don't mess with it */
-	for (; i < NR_PKEYS; i++) {
+	for (i=1; i < NR_PKEYS; i++) {
 		if (pkey == i)
 			continue;
 

@@ -1455,6 +1516,7 @@ void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
 	test_pkey_syscalls_on_non_allocated_pkey,
 	test_pkey_syscalls_bad_args,
 	test_pkey_alloc_exhaust,
+	test_pkey_alloc_free_attach_pkey0,
 };
 
 void run_tests_once(void)