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Diffstat (limited to 'arch/sh/mm/fault.c')
-rw-r--r--arch/sh/mm/fault.c125
1 files changed, 66 insertions, 59 deletions
diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c
index 5f51456f4fc7..acd2f5e50bfc 100644
--- a/arch/sh/mm/fault.c
+++ b/arch/sh/mm/fault.c
@@ -47,12 +47,13 @@ static void show_pte(struct mm_struct *mm, unsigned long addr)
pgd = swapper_pg_dir;
}
- printk(KERN_ALERT "pgd = %p\n", pgd);
+ pr_alert("pgd = %p\n", pgd);
pgd += pgd_index(addr);
- printk(KERN_ALERT "[%08lx] *pgd=%0*Lx", addr,
- (u32)(sizeof(*pgd) * 2), (u64)pgd_val(*pgd));
+ pr_alert("[%08lx] *pgd=%0*llx", addr, (u32)(sizeof(*pgd) * 2),
+ (u64)pgd_val(*pgd));
do {
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@@ -61,33 +62,46 @@ static void show_pte(struct mm_struct *mm, unsigned long addr)
break;
if (pgd_bad(*pgd)) {
- printk("(bad)");
+ pr_cont("(bad)");
break;
}
- pud = pud_offset(pgd, addr);
+ p4d = p4d_offset(pgd, addr);
+ if (PTRS_PER_P4D != 1)
+ pr_cont(", *p4d=%0*Lx", (u32)(sizeof(*p4d) * 2),
+ (u64)p4d_val(*p4d));
+
+ if (p4d_none(*p4d))
+ break;
+
+ if (p4d_bad(*p4d)) {
+ pr_cont("(bad)");
+ break;
+ }
+
+ pud = pud_offset(p4d, addr);
if (PTRS_PER_PUD != 1)
- printk(", *pud=%0*Lx", (u32)(sizeof(*pud) * 2),
- (u64)pud_val(*pud));
+ pr_cont(", *pud=%0*llx", (u32)(sizeof(*pud) * 2),
+ (u64)pud_val(*pud));
if (pud_none(*pud))
break;
if (pud_bad(*pud)) {
- printk("(bad)");
+ pr_cont("(bad)");
break;
}
pmd = pmd_offset(pud, addr);
if (PTRS_PER_PMD != 1)
- printk(", *pmd=%0*Lx", (u32)(sizeof(*pmd) * 2),
- (u64)pmd_val(*pmd));
+ pr_cont(", *pmd=%0*llx", (u32)(sizeof(*pmd) * 2),
+ (u64)pmd_val(*pmd));
if (pmd_none(*pmd))
break;
if (pmd_bad(*pmd)) {
- printk("(bad)");
+ pr_cont("(bad)");
break;
}
@@ -96,17 +110,18 @@ static void show_pte(struct mm_struct *mm, unsigned long addr)
break;
pte = pte_offset_kernel(pmd, addr);
- printk(", *pte=%0*Lx", (u32)(sizeof(*pte) * 2),
- (u64)pte_val(*pte));
+ pr_cont(", *pte=%0*llx", (u32)(sizeof(*pte) * 2),
+ (u64)pte_val(*pte));
} while (0);
- printk("\n");
+ pr_cont("\n");
}
static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
{
unsigned index = pgd_index(address);
pgd_t *pgd_k;
+ p4d_t *p4d, *p4d_k;
pud_t *pud, *pud_k;
pmd_t *pmd, *pmd_k;
@@ -116,8 +131,13 @@ static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
if (!pgd_present(*pgd_k))
return NULL;
- pud = pud_offset(pgd, address);
- pud_k = pud_offset(pgd_k, address);
+ p4d = p4d_offset(pgd, address);
+ p4d_k = p4d_offset(pgd_k, address);
+ if (!p4d_present(*p4d_k))
+ return NULL;
+
+ pud = pud_offset(p4d, address);
+ pud_k = pud_offset(p4d_k, address);
if (!pud_present(*pud_k))
return NULL;
@@ -188,14 +208,11 @@ show_fault_oops(struct pt_regs *regs, unsigned long address)
if (!oops_may_print())
return;
- printk(KERN_ALERT "BUG: unable to handle kernel ");
- if (address < PAGE_SIZE)
- printk(KERN_CONT "NULL pointer dereference");
- else
- printk(KERN_CONT "paging request");
-
- printk(KERN_CONT " at %08lx\n", address);
- printk(KERN_ALERT "PC:");
+ pr_alert("BUG: unable to handle kernel %s at %08lx\n",
+ address < PAGE_SIZE ? "NULL pointer dereference"
+ : "paging request",
+ address);
+ pr_alert("PC:");
printk_address(regs->pc, 1);
show_pte(NULL, address);
@@ -221,8 +238,6 @@ no_context(struct pt_regs *regs, unsigned long error_code,
show_fault_oops(regs, address);
die("Oops", regs, error_code);
- bust_spinlocks(0);
- do_exit(SIGKILL);
}
static void
@@ -261,7 +276,7 @@ __bad_area(struct pt_regs *regs, unsigned long error_code,
* Something tried to access memory that isn't in our memory map..
* Fix it, but check if it's kernel or user first..
*/
- up_read(&mm->mmap_sem);
+ mmap_read_unlock(mm);
__bad_area_nosemaphore(regs, error_code, address, si_code);
}
@@ -285,7 +300,7 @@ do_sigbus(struct pt_regs *regs, unsigned long error_code, unsigned long address)
struct task_struct *tsk = current;
struct mm_struct *mm = tsk->mm;
- up_read(&mm->mmap_sem);
+ mmap_read_unlock(mm);
/* Kernel mode? Handle exceptions or die: */
if (!user_mode(regs))
@@ -302,25 +317,25 @@ mm_fault_error(struct pt_regs *regs, unsigned long error_code,
* Pagefault was interrupted by SIGKILL. We have no reason to
* continue pagefault.
*/
- if (fatal_signal_pending(current)) {
- if (!(fault & VM_FAULT_RETRY))
- up_read(&current->mm->mmap_sem);
+ if (fault_signal_pending(fault, regs)) {
if (!user_mode(regs))
no_context(regs, error_code, address);
return 1;
}
+ /* Release mmap_lock first if necessary */
+ if (!(fault & VM_FAULT_RETRY))
+ mmap_read_unlock(current->mm);
+
if (!(fault & VM_FAULT_ERROR))
return 0;
if (fault & VM_FAULT_OOM) {
/* Kernel mode? Handle exceptions or die: */
if (!user_mode(regs)) {
- up_read(&current->mm->mmap_sem);
no_context(regs, error_code, address);
return 1;
}
- up_read(&current->mm->mmap_sem);
/*
* We ran out of memory, call the OOM killer, and return the
@@ -355,7 +370,7 @@ static inline int access_error(int error_code, struct vm_area_struct *vma)
return 1;
/* read, not present: */
- if (unlikely(!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))))
+ if (unlikely(!vma_is_accessible(vma)))
return 1;
return 0;
@@ -380,7 +395,7 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
struct mm_struct *mm;
struct vm_area_struct * vma;
vm_fault_t fault;
- unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
+ unsigned int flags = FAULT_FLAG_DEFAULT;
tsk = current;
mm = tsk->mm;
@@ -424,7 +439,7 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
}
retry:
- down_read(&mm->mmap_sem);
+ mmap_read_lock(mm);
vma = find_vma(mm, address);
if (unlikely(!vma)) {
@@ -464,34 +479,26 @@ good_area:
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/
- fault = handle_mm_fault(vma, address, flags);
+ fault = handle_mm_fault(vma, address, flags, regs);
if (unlikely(fault & (VM_FAULT_RETRY | VM_FAULT_ERROR)))
if (mm_fault_error(regs, error_code, address, fault))
return;
- if (flags & FAULT_FLAG_ALLOW_RETRY) {
- if (fault & VM_FAULT_MAJOR) {
- tsk->maj_flt++;
- perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1,
- regs, address);
- } else {
- tsk->min_flt++;
- perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1,
- regs, address);
- }
- if (fault & VM_FAULT_RETRY) {
- flags &= ~FAULT_FLAG_ALLOW_RETRY;
- flags |= FAULT_FLAG_TRIED;
-
- /*
- * No need to up_read(&mm->mmap_sem) as we would
- * have already released it in __lock_page_or_retry
- * in mm/filemap.c.
- */
- goto retry;
- }
+ /* The fault is fully completed (including releasing mmap lock) */
+ if (fault & VM_FAULT_COMPLETED)
+ return;
+
+ if (fault & VM_FAULT_RETRY) {
+ flags |= FAULT_FLAG_TRIED;
+
+ /*
+ * No need to mmap_read_unlock(mm) as we would
+ * have already released it in __lock_page_or_retry
+ * in mm/filemap.c.
+ */
+ goto retry;
}
- up_read(&mm->mmap_sem);
+ mmap_read_unlock(mm);
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.