* Copyright (c) 2009-2016 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
- *
+ *
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <mach_assert.h>
#include <i386/param.h>
#include <i386/misc_protos.h>
#include <i386/cpu_data.h>
+#include <i386/machine_cpu.h>
#include <i386/machine_routines.h>
#include <i386/cpuid.h>
#include <i386/vmx.h>
#include <kern/copyout_shim.h>
-
+#undef copyin
+#undef copyout
static int copyio(int, user_addr_t, char *, vm_size_t, vm_size_t *, int);
static int copyio_phys(addr64_t, addr64_t, vm_size_t, int);
*/
extern int _bcopy(const void *, void *, vm_size_t);
extern int _bcopystr(const void *, void *, vm_size_t, vm_size_t *);
-extern int _copyin_word(const char *src, uint64_t *dst, vm_size_t len);
+extern int _copyin_atomic32(const char *src, uint32_t *dst);
+extern int _copyin_atomic64(const char *src, uint64_t *dst);
+extern int _copyout_atomic32(const uint32_t *u32, char *src);
+extern int _copyout_atomic64(const uint64_t *u64, char *src);
+/* On by default, optionally disabled by boot-arg */
+extern boolean_t copyio_zalloc_check;
/*
* Types of copies:
*/
-#define COPYIN 0 /* from user virtual to kernel virtual */
-#define COPYOUT 1 /* from kernel virtual to user virtual */
-#define COPYINSTR 2 /* string variant of copyout */
-#define COPYINPHYS 3 /* from user virtual to kernel physical */
-#define COPYOUTPHYS 4 /* from kernel physical to user virtual */
-#define COPYINWORD 5 /* from user virtual to kernel virtual */
+#define COPYIN 0 /* from user virtual to kernel virtual */
+#define COPYOUT 1 /* from kernel virtual to user virtual */
+#define COPYINSTR 2 /* string variant of copyout */
+#define COPYINPHYS 3 /* from user virtual to kernel physical */
+#define COPYOUTPHYS 4 /* from kernel physical to user virtual */
+#define COPYINATOMIC32 5 /* from user virtual to kernel virtual */
+#define COPYINATOMIC64 6 /* from user virtual to kernel virtual */
+#define COPYOUTATOMIC32 7 /* from user virtual to kernel virtual */
+#define COPYOUTATOMIC64 8 /* from user virtual to kernel virtual */
#if ENABLE_SMAPLOG
typedef struct {
- uint64_t timestamp;
- thread_t thread;
- uintptr_t cr4;
- uint8_t cpuid;
- uint8_t smap_state;
- uint8_t copyio_active;
+ uint64_t timestamp;
+ thread_t thread;
+ uintptr_t cr4;
+ uint8_t cpuid;
+ uint8_t smap_state;
+ uint8_t copyio_active;
} smaplog_entry_t;
#define SMAPLOG_BUFFER_SIZE (50)
-static smaplog_entry_t smaplog_cbuf[SMAPLOG_BUFFER_SIZE];
-static uint32_t smaplog_head = 0;
+static smaplog_entry_t smaplog_cbuf[SMAPLOG_BUFFER_SIZE];
+static uint32_t smaplog_head = 0;
static void
smaplog_add_entry(boolean_t enabling)
#endif /* ENABLE_SMAPLOG */
extern boolean_t pmap_smap_enabled;
-static inline void user_access_enable(void) {
+static inline void
+user_access_enable(void)
+{
if (pmap_smap_enabled) {
stac();
#if ENABLE_SMAPLOG
#endif
}
}
-static inline void user_access_disable(void) {
+static inline void
+user_access_disable(void)
+{
if (pmap_smap_enabled) {
clac();
#if ENABLE_SMAPLOG
static int
copyio(int copy_type, user_addr_t user_addr, char *kernel_addr,
- vm_size_t nbytes, vm_size_t *lencopied, int use_kernel_map)
+ vm_size_t nbytes, vm_size_t *lencopied, int use_kernel_map)
{
- thread_t thread = current_thread();
- pmap_t pmap;
- vm_size_t bytes_copied;
- int error = 0;
- boolean_t istate = FALSE;
- boolean_t recursive_CopyIOActive;
-#if COPYIO_TRACE_ENABLED
- int debug_type = 0xeff70010;
+ thread_t thread = current_thread();
+ pmap_t pmap;
+ vm_size_t bytes_copied;
+ int error = 0;
+ boolean_t istate = FALSE;
+ boolean_t recursive_CopyIOActive;
+#if COPYIO_TRACE_ENABLED
+ int debug_type = 0xeff70010;
debug_type += (copy_type << 2);
#endif
- boolean_t nopagezero = thread->map->pmap->pagezero_accessible;
+ vm_size_t kernel_buf_size = 0;
- if (__improbable(nbytes > copysize_limit_panic))
+ if (__improbable(nbytes > copysize_limit_panic)) {
panic("%s(%p, %p, %lu) - transfer too large", __func__,
- (void *)user_addr, (void *)kernel_addr, nbytes);
+ (void *)user_addr, (void *)kernel_addr, nbytes);
+ }
COPYIO_TRACE(debug_type | DBG_FUNC_START,
user_addr, kernel_addr, nbytes, use_kernel_map, 0);
- if (__improbable(nbytes == 0))
+ if (__improbable(nbytes == 0)) {
goto out;
+ }
- pmap = thread->map->pmap;
+ pmap = thread->map->pmap;
+ boolean_t nopagezero = thread->map->pmap->pagezero_accessible;
- if (__improbable((copy_type != COPYINPHYS) && (copy_type != COPYOUTPHYS) && ((vm_offset_t)kernel_addr < VM_MIN_KERNEL_AND_KEXT_ADDRESS))) {
- panic("Invalid copy parameter, copy type: %d, kernel address: %p", copy_type, kernel_addr);
+ if ((copy_type != COPYINPHYS) && (copy_type != COPYOUTPHYS)) {
+ if (__improbable((vm_offset_t)kernel_addr < VM_MIN_KERNEL_AND_KEXT_ADDRESS)) {
+ panic("Invalid copy parameter, copy type: %d, kernel address: %p", copy_type, kernel_addr);
+ }
+ if (__probable(copyio_zalloc_check)) {
+ kernel_buf_size = zone_element_size(kernel_addr, NULL);
+ if (__improbable(kernel_buf_size && kernel_buf_size < nbytes)) {
+ panic("copyio: kernel buffer %p has size %lu < nbytes %lu", kernel_addr, kernel_buf_size, nbytes);
+ }
+ }
}
/* Sanity and security check for addresses to/from a user */
if (__improbable(((pmap != kernel_pmap) && (use_kernel_map == 0)) &&
- ((nbytes && (user_addr+nbytes <= user_addr)) || ((user_addr + nbytes) > vm_map_max(thread->map))))) {
+ ((nbytes && (user_addr + nbytes <= user_addr)) || ((user_addr + nbytes) > vm_map_max(thread->map))))) {
error = EFAULT;
goto out;
}
+ if (copy_type >= COPYINATOMIC32 && copy_type <= COPYOUTATOMIC64) {
+ if (__improbable(pmap == kernel_pmap)) {
+ error = EFAULT;
+ goto out;
+ }
+ }
+
#if KASAN
- if (copy_type == COPYIN || copy_type == COPYINSTR || copy_type == COPYINWORD) {
+ switch (copy_type) {
+ case COPYIN:
+ case COPYINSTR:
+ case COPYINATOMIC32:
+ case COPYINATOMIC64:
__asan_storeN((uptr)kernel_addr, nbytes);
- } else if (copy_type == COPYOUT) {
+ break;
+ case COPYOUT:
+ case COPYOUTATOMIC32:
+ case COPYOUTATOMIC64:
__asan_loadN((uptr)kernel_addr, nbytes);
+ kasan_check_uninitialized((vm_address_t)kernel_addr, nbytes);
+ break;
}
#endif
/*
- * If the no_shared_cr3 boot-arg is set (true), the kernel runs on
+ * If the no_shared_cr3 boot-arg is set (true), the kernel runs on
* its own pmap and cr3 rather than the user's -- so that wild accesses
* from kernel or kexts can be trapped. So, during copyin and copyout,
* we need to switch back to the user's map/cr3. The thread is flagged
user_access_enable();
-#if DEVELOPMENT || DEBUG
+#if DEVELOPMENT || DEBUG
/*
* Ensure that we're running on the target thread's cr3.
*/
if ((pmap != kernel_pmap) && !use_kernel_map &&
(get_cr3_base() != pmap->pm_cr3)) {
panic("copyio(%d,%p,%p,%ld,%p,%d) cr3 is %p expects %p",
- copy_type, (void *)user_addr, kernel_addr, nbytes, lencopied, use_kernel_map,
- (void *) get_cr3_raw(), (void *) pmap->pm_cr3);
+ copy_type, (void *)user_addr, kernel_addr, nbytes, lencopied, use_kernel_map,
+ (void *) get_cr3_raw(), (void *) pmap->pm_cr3);
}
#endif
}
COPYIO_TRACE(0xeff70044 | DBG_FUNC_NONE, user_addr,
- kernel_addr, nbytes, 0, 0);
-
- switch (copy_type) {
+ kernel_addr, nbytes, 0, 0);
+ switch (copy_type) {
case COPYIN:
- error = _bcopy((const void *) user_addr,
- kernel_addr,
- nbytes);
+ error = _bcopy((const void *) user_addr,
+ kernel_addr,
+ nbytes);
break;
-
+
case COPYOUT:
- error = _bcopy(kernel_addr,
- (void *) user_addr,
- nbytes);
+ error = _bcopy(kernel_addr,
+ (void *) user_addr,
+ nbytes);
break;
case COPYINPHYS:
- error = _bcopy((const void *) user_addr,
- PHYSMAP_PTOV(kernel_addr),
- nbytes);
+ error = _bcopy((const void *) user_addr,
+ PHYSMAP_PTOV(kernel_addr),
+ nbytes);
break;
case COPYOUTPHYS:
- error = _bcopy((const void *) PHYSMAP_PTOV(kernel_addr),
- (void *) user_addr,
- nbytes);
+ error = _bcopy((const void *) PHYSMAP_PTOV(kernel_addr),
+ (void *) user_addr,
+ nbytes);
break;
- case COPYINWORD:
- error = _copyin_word((const void *) user_addr,
- (void *) kernel_addr,
- nbytes);
+ case COPYINATOMIC32:
+ error = _copyin_atomic32((const void *) user_addr,
+ (void *) kernel_addr);
+ break;
+
+ case COPYINATOMIC64:
+ error = _copyin_atomic64((const void *) user_addr,
+ (void *) kernel_addr);
+ break;
+
+ case COPYOUTATOMIC32:
+ error = _copyout_atomic32((const void *) kernel_addr,
+ (void *) user_addr);
+ break;
+
+ case COPYOUTATOMIC64:
+ error = _copyout_atomic64((const void *) kernel_addr,
+ (void *) user_addr);
break;
case COPYINSTR:
- error = _bcopystr((const void *) user_addr,
- kernel_addr,
- (int) nbytes,
- &bytes_copied);
+ error = _bcopystr((const void *) user_addr,
+ kernel_addr,
+ (int) nbytes,
+ &bytes_copied);
/*
* lencopied should be updated on success
* or ENAMETOOLONG... but not EFAULT
*/
- if (error != EFAULT)
- *lencopied = bytes_copied;
+ if (error != EFAULT) {
+ *lencopied = bytes_copied;
+ }
if (error) {
#if KDEBUG
- nbytes = *lencopied;
+ nbytes = *lencopied;
#endif
- break;
+ break;
}
if (*(kernel_addr + bytes_copied - 1) == 0) {
- /*
+ /*
* we found a NULL terminator... we're done
*/
#if KDEBUG
- nbytes = *lencopied;
+ nbytes = *lencopied;
#endif
break;
} else {
- /*
+ /*
* no more room in the buffer and we haven't
* yet come across a NULL terminator
*/
#if KDEBUG
- nbytes = *lencopied;
+ nbytes = *lencopied;
#endif
- error = ENAMETOOLONG;
+ error = ENAMETOOLONG;
break;
}
}
if (__improbable(pdswitch)) {
istate = ml_set_interrupts_enabled(FALSE);
- if (!recursive_CopyIOActive && (get_cr3_raw() != kernel_pmap->pm_cr3)) {
+ if (!recursive_CopyIOActive && (get_cr3_raw() != kernel_pmap->pm_cr3)) {
if (nopagezero && pmap_pcid_ncpus) {
pmap_pcid_activate(pmap, cpu_number(), TRUE, FALSE);
} else {
out:
COPYIO_TRACE(debug_type | DBG_FUNC_END, user_addr, kernel_addr, nbytes, error, 0);
- return (error);
+ return error;
}
static int
copyio_phys(addr64_t source, addr64_t sink, vm_size_t csize, int which)
{
- char *paddr;
+ char *paddr;
user_addr_t vaddr;
int ctype;
if (which & cppvPsnk) {
paddr = (char *)sink;
- vaddr = (user_addr_t)source;
+ vaddr = (user_addr_t)source;
ctype = COPYINPHYS;
} else {
- paddr = (char *)source;
+ paddr = (char *)source;
vaddr = (user_addr_t)sink;
ctype = COPYOUTPHYS;
- CALL_COPYOUT_SHIM_PHYS((void *)PHYSMAP_PTOV(source),sink,csize)
+ CALL_COPYOUT_SHIM_PHYS((void *)PHYSMAP_PTOV(source), sink, csize)
}
return copyio(ctype, vaddr, paddr, csize, NULL, which & cppvKmap);
}
int
copyinmsg(const user_addr_t user_addr, char *kernel_addr, mach_msg_size_t nbytes)
{
- return copyio(COPYIN, user_addr, kernel_addr, nbytes, NULL, 0);
-}
+ return copyio(COPYIN, user_addr, kernel_addr, nbytes, NULL, 0);
+}
int
-copyin(const user_addr_t user_addr, char *kernel_addr, vm_size_t nbytes)
+copyin(const user_addr_t user_addr, void *kernel_addr, vm_size_t nbytes)
{
- return copyio(COPYIN, user_addr, kernel_addr, nbytes, NULL, 0);
+ return copyio(COPYIN, user_addr, kernel_addr, nbytes, NULL, 0);
}
/*
- * copyin_word
- * Read an aligned value from userspace as a single memory transaction.
- * This function supports userspace synchronization features
+ * copy{in,out}_atomic{32,64}
+ * Read or store an aligned value from userspace as a single memory transaction.
+ * These functions support userspace synchronization features
*/
int
-copyin_word(const user_addr_t user_addr, uint64_t *kernel_addr, vm_size_t nbytes)
+copyin_atomic32(const user_addr_t user_addr, uint32_t *kernel_addr)
{
- /* Verify sizes */
- if ((nbytes != 4) && (nbytes != 8))
+ /* Test alignment */
+ if (user_addr & 3) {
return EINVAL;
+ }
+ return copyio(COPYINATOMIC32, user_addr, (char *)(uintptr_t)kernel_addr, 4, NULL, 0);
+}
+int
+copyin_atomic32_wait_if_equals(const user_addr_t user_addr, uint32_t value)
+{
+ uint32_t u32;
+ int result = copyin_atomic32(user_addr, &u32);
+ if (__improbable(result)) {
+ return result;
+ }
+ if (u32 != value) {
+ return ESTALE;
+ }
+ cpu_pause();
+ return 0;
+}
+
+int
+copyin_atomic64(const user_addr_t user_addr, uint64_t *kernel_addr)
+{
/* Test alignment */
- if (user_addr & (nbytes - 1))
+ if (user_addr & 7) {
return EINVAL;
- return copyio(COPYINWORD, user_addr, (char *)(uintptr_t)kernel_addr, nbytes, NULL, 0);
+ }
+ return copyio(COPYINATOMIC64, user_addr, (char *)(uintptr_t)kernel_addr, 8, NULL, 0);
}
int
-copyinstr(const user_addr_t user_addr, char *kernel_addr, vm_size_t nbytes, vm_size_t *lencopied)
+copyout_atomic32(uint32_t value, user_addr_t user_addr)
{
- *lencopied = 0;
+ /* Test alignment */
+ if (user_addr & 3) {
+ return EINVAL;
+ }
+ return copyio(COPYOUTATOMIC32, user_addr, (char *)&value, 4, NULL, 0);
+}
- return copyio(COPYINSTR, user_addr, kernel_addr, nbytes, lencopied, 0);
+int
+copyout_atomic64(uint64_t value, user_addr_t user_addr)
+{
+ /* Test alignment */
+ if (user_addr & 7) {
+ return EINVAL;
+ }
+ return copyio(COPYOUTATOMIC64, user_addr, (char *)&value, 8, NULL, 0);
+}
+
+int
+copyinstr(const user_addr_t user_addr, char *kernel_addr, vm_size_t nbytes, vm_size_t *lencopied)
+{
+ *lencopied = 0;
+
+ return copyio(COPYINSTR, user_addr, kernel_addr, nbytes, lencopied, 0);
}
int
copyoutmsg(const char *kernel_addr, user_addr_t user_addr, mach_msg_size_t nbytes)
{
- CALL_COPYOUT_SHIM_MSG(kernel_addr,user_addr,(vm_size_t)nbytes)
- return copyio(COPYOUT, user_addr, (char *)(uintptr_t)kernel_addr, nbytes, NULL, 0);
+ CALL_COPYOUT_SHIM_MSG(kernel_addr, user_addr, (vm_size_t)nbytes)
+ return copyio(COPYOUT, user_addr, (char *)(uintptr_t)kernel_addr, nbytes, NULL, 0);
}
int
copyout(const void *kernel_addr, user_addr_t user_addr, vm_size_t nbytes)
{
- CALL_COPYOUT_SHIM_NRML(kernel_addr,user_addr,nbytes)
- return copyio(COPYOUT, user_addr, (char *)(uintptr_t)kernel_addr, nbytes, NULL, 0);
+ CALL_COPYOUT_SHIM_NRML(kernel_addr, user_addr, nbytes)
+ return copyio(COPYOUT, user_addr, (char *)(uintptr_t)kernel_addr, nbytes, NULL, 0);
}
{
unsigned int lop, csize;
int bothphys = 0;
-
- KERNEL_DEBUG(0xeff7004c | DBG_FUNC_START, (unsigned)src64,
- (unsigned)snk64, size, which, 0);
- if ((which & (cppvPsrc | cppvPsnk)) == 0 ) /* Make sure that only one is virtual */
- panic("copypv: no more than 1 parameter may be virtual\n"); /* Not allowed */
-
- if ((which & (cppvPsrc | cppvPsnk)) == (cppvPsrc | cppvPsnk))
- bothphys = 1; /* both are physical */
+ KERNEL_DEBUG(0xeff7004c | DBG_FUNC_START, (unsigned)src64,
+ (unsigned)snk64, size, which, 0);
+ if ((which & (cppvPsrc | cppvPsnk)) == 0) { /* Make sure that only one is virtual */
+ panic("copypv: no more than 1 parameter may be virtual\n"); /* Not allowed */
+ }
+ if ((which & (cppvPsrc | cppvPsnk)) == (cppvPsrc | cppvPsnk)) {
+ bothphys = 1; /* both are physical */
+ }
while (size) {
-
- if (bothphys) {
- lop = (unsigned int)(PAGE_SIZE - (snk64 & (PAGE_SIZE - 1))); /* Assume sink smallest */
+ if (bothphys) {
+ lop = (unsigned int)(PAGE_SIZE - (snk64 & (PAGE_SIZE - 1))); /* Assume sink smallest */
- if (lop > (unsigned int)(PAGE_SIZE - (src64 & (PAGE_SIZE - 1))))
- lop = (unsigned int)(PAGE_SIZE - (src64 & (PAGE_SIZE - 1))); /* No, source is smaller */
+ if (lop > (unsigned int)(PAGE_SIZE - (src64 & (PAGE_SIZE - 1)))) {
+ lop = (unsigned int)(PAGE_SIZE - (src64 & (PAGE_SIZE - 1))); /* No, source is smaller */
+ }
} else {
- /*
+ /*
* only need to compute the resid for the physical page
* address... we don't care about where we start/finish in
* the virtual since we just call the normal copyin/copyout
*/
- if (which & cppvPsrc)
- lop = (unsigned int)(PAGE_SIZE - (src64 & (PAGE_SIZE - 1)));
- else
- lop = (unsigned int)(PAGE_SIZE - (snk64 & (PAGE_SIZE - 1)));
+ if (which & cppvPsrc) {
+ lop = (unsigned int)(PAGE_SIZE - (src64 & (PAGE_SIZE - 1)));
+ } else {
+ lop = (unsigned int)(PAGE_SIZE - (snk64 & (PAGE_SIZE - 1)));
+ }
+ }
+ csize = size; /* Assume we can copy it all */
+ if (lop < size) {
+ csize = lop; /* Nope, we can't do it all */
}
- csize = size; /* Assume we can copy it all */
- if (lop < size)
- csize = lop; /* Nope, we can't do it all */
-#if 0
+#if 0
/*
- * flush_dcache64 is currently a nop on the i386...
+ * flush_dcache64 is currently a nop on the i386...
* it's used when copying to non-system memory such
* as video capture cards... on PPC there was a need
* to flush due to how we mapped this memory... not
* sure if it's needed on i386.
*/
- if (which & cppvFsrc)
- flush_dcache64(src64, csize, 1); /* If requested, flush source before move */
- if (which & cppvFsnk)
- flush_dcache64(snk64, csize, 1); /* If requested, flush sink before move */
+ if (which & cppvFsrc) {
+ flush_dcache64(src64, csize, 1); /* If requested, flush source before move */
+ }
+ if (which & cppvFsnk) {
+ flush_dcache64(snk64, csize, 1); /* If requested, flush sink before move */
+ }
#endif
- if (bothphys)
- bcopy_phys(src64, snk64, csize); /* Do a physical copy, virtually */
- else {
- if (copyio_phys(src64, snk64, csize, which))
- return (KERN_FAILURE);
+ if (bothphys) {
+ bcopy_phys(src64, snk64, csize); /* Do a physical copy, virtually */
+ } else {
+ if (copyio_phys(src64, snk64, csize, which)) {
+ return KERN_FAILURE;
+ }
}
#if 0
- if (which & cppvFsrc)
- flush_dcache64(src64, csize, 1); /* If requested, flush source after move */
- if (which & cppvFsnk)
- flush_dcache64(snk64, csize, 1); /* If requested, flush sink after move */
+ if (which & cppvFsrc) {
+ flush_dcache64(src64, csize, 1); /* If requested, flush source after move */
+ }
+ if (which & cppvFsnk) {
+ flush_dcache64(snk64, csize, 1); /* If requested, flush sink after move */
+ }
#endif
- size -= csize; /* Calculate what is left */
- snk64 += csize; /* Bump sink to next physical address */
- src64 += csize; /* Bump source to next physical address */
+ size -= csize; /* Calculate what is left */
+ snk64 += csize; /* Bump sink to next physical address */
+ src64 += csize; /* Bump source to next physical address */
}
KERNEL_DEBUG(0xeff7004c | DBG_FUNC_END, (unsigned)src64,
- (unsigned)snk64, size, which, 0);
+ (unsigned)snk64, size, which, 0);
return KERN_SUCCESS;
}
projects / apple / xnu.git / blobdiff