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-rw-r--r--mm/internal.h5
-rw-r--r--mm/madvise.c8
-rw-r--r--mm/mlock.c16
-rw-r--r--mm/mmap.c27
-rw-r--r--mm/mprotect.c3
-rw-r--r--mm/mremap.c3
-rw-r--r--mm/nommu.c2
-rw-r--r--mm/util.c12
8 files changed, 55 insertions, 21 deletions
diff --git a/mm/internal.h b/mm/internal.h
index f6f3353..bff7fd7 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -442,9 +442,10 @@ extern u64 hwpoison_filter_flags_value;
extern u64 hwpoison_filter_memcg;
extern u32 hwpoison_filter_enable;
-extern unsigned long vm_mmap_pgoff(struct file *, unsigned long,
+extern unsigned long __must_check vm_mmap_pgoff(struct file *, unsigned long,
unsigned long, unsigned long,
- unsigned long, unsigned long);
+ unsigned long, unsigned long,
+ bool);
extern void set_pageblock_order(void);
unsigned long reclaim_clean_pages_from_list(struct zone *zone,
diff --git a/mm/madvise.c b/mm/madvise.c
index 07427d3..93fb63e 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -707,10 +707,12 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
return error;
write = madvise_need_mmap_write(behavior);
- if (write)
- down_write(&current->mm->mmap_sem);
- else
+ if (write) {
+ if (down_write_killable(&current->mm->mmap_sem))
+ return -EINTR;
+ } else {
down_read(&current->mm->mmap_sem);
+ }
/*
* If the interval [start,end) covers some unmapped address
diff --git a/mm/mlock.c b/mm/mlock.c
index 96f0010..ef8dc9f 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -617,7 +617,7 @@ static int apply_vma_lock_flags(unsigned long start, size_t len,
return error;
}
-static int do_mlock(unsigned long start, size_t len, vm_flags_t flags)
+static __must_check int do_mlock(unsigned long start, size_t len, vm_flags_t flags)
{
unsigned long locked;
unsigned long lock_limit;
@@ -635,7 +635,8 @@ static int do_mlock(unsigned long start, size_t len, vm_flags_t flags)
lock_limit >>= PAGE_SHIFT;
locked = len >> PAGE_SHIFT;
- down_write(&current->mm->mmap_sem);
+ if (down_write_killable(&current->mm->mmap_sem))
+ return -EINTR;
locked += current->mm->locked_vm;
@@ -678,7 +679,8 @@ SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len)
len = PAGE_ALIGN(len + (offset_in_page(start)));
start &= PAGE_MASK;
- down_write(&current->mm->mmap_sem);
+ if (down_write_killable(&current->mm->mmap_sem))
+ return -EINTR;
ret = apply_vma_lock_flags(start, len, 0);
up_write(&current->mm->mmap_sem);
@@ -748,9 +750,10 @@ SYSCALL_DEFINE1(mlockall, int, flags)
lock_limit = rlimit(RLIMIT_MEMLOCK);
lock_limit >>= PAGE_SHIFT;
- ret = -ENOMEM;
- down_write(&current->mm->mmap_sem);
+ if (down_write_killable(&current->mm->mmap_sem))
+ return -EINTR;
+ ret = -ENOMEM;
if (!(flags & MCL_CURRENT) || (current->mm->total_vm <= lock_limit) ||
capable(CAP_IPC_LOCK))
ret = apply_mlockall_flags(flags);
@@ -765,7 +768,8 @@ SYSCALL_DEFINE0(munlockall)
{
int ret;
- down_write(&current->mm->mmap_sem);
+ if (down_write_killable(&current->mm->mmap_sem))
+ return -EINTR;
ret = apply_mlockall_flags(0);
up_write(&current->mm->mmap_sem);
return ret;
diff --git a/mm/mmap.c b/mm/mmap.c
index b9274a0..11e1f2c 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -178,7 +178,8 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
unsigned long min_brk;
bool populate;
- down_write(&mm->mmap_sem);
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
#ifdef CONFIG_COMPAT_BRK
/*
@@ -1332,7 +1333,7 @@ SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len,
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
- retval = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff);
+ retval = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff, true);
out_fput:
if (file)
fput(file);
@@ -2493,6 +2494,10 @@ int vm_munmap(unsigned long start, size_t len)
int ret;
struct mm_struct *mm = current->mm;
+ /*
+ * XXX convert to down_write_killable as soon as all users are able
+ * to handle the error.
+ */
down_write(&mm->mmap_sem);
ret = do_munmap(mm, start, len);
up_write(&mm->mmap_sem);
@@ -2502,8 +2507,15 @@ EXPORT_SYMBOL(vm_munmap);
SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len)
{
+ int ret;
+ struct mm_struct *mm = current->mm;
+
profile_munmap(addr);
- return vm_munmap(addr, len);
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
+ ret = do_munmap(mm, addr, len);
+ up_write(&mm->mmap_sem);
+ return ret;
}
@@ -2535,7 +2547,9 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
if (pgoff + (size >> PAGE_SHIFT) < pgoff)
return ret;
- down_write(&mm->mmap_sem);
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
+
vma = find_vma(mm, start);
if (!vma || !(vma->vm_flags & VM_SHARED))
@@ -2700,6 +2714,11 @@ unsigned long vm_brk(unsigned long addr, unsigned long len)
unsigned long ret;
bool populate;
+ /*
+ * XXX not all users are chcecking the return value, convert
+ * to down_write_killable after they are able to cope with
+ * error
+ */
down_write(&mm->mmap_sem);
ret = do_brk(addr, len);
populate = ((mm->def_flags & VM_LOCKED) != 0);
diff --git a/mm/mprotect.c b/mm/mprotect.c
index b650c54..5019a1e 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -379,7 +379,8 @@ SYSCALL_DEFINE3(mprotect, unsigned long, start, size_t, len,
reqprot = prot;
- down_write(&current->mm->mmap_sem);
+ if (down_write_killable(&current->mm->mmap_sem))
+ return -EINTR;
vma = find_vma(current->mm, start);
error = -ENOMEM;
diff --git a/mm/mremap.c b/mm/mremap.c
index 9dc4999..1f157ad 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -503,7 +503,8 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
if (!new_len)
return ret;
- down_write(&current->mm->mmap_sem);
+ if (down_write_killable(&current->mm->mmap_sem))
+ return -EINTR;
if (flags & MREMAP_FIXED) {
ret = mremap_to(addr, old_len, new_addr, new_len,
diff --git a/mm/nommu.c b/mm/nommu.c
index c8bd59a..b7451274 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1446,7 +1446,7 @@ SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len,
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
- retval = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff);
+ retval = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff, true);
if (file)
fput(file);
diff --git a/mm/util.c b/mm/util.c
index 8a1b3a1..03b2377 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -289,7 +289,7 @@ EXPORT_SYMBOL_GPL(get_user_pages_fast);
unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr,
unsigned long len, unsigned long prot,
- unsigned long flag, unsigned long pgoff)
+ unsigned long flag, unsigned long pgoff, bool killable)
{
unsigned long ret;
struct mm_struct *mm = current->mm;
@@ -297,7 +297,12 @@ unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr,
ret = security_mmap_file(file, prot, flag);
if (!ret) {
- down_write(&mm->mmap_sem);
+ if (killable) {
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
+ } else {
+ down_write(&mm->mmap_sem);
+ }
ret = do_mmap_pgoff(file, addr, len, prot, flag, pgoff,
&populate);
up_write(&mm->mmap_sem);
@@ -307,6 +312,7 @@ unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr,
return ret;
}
+/* XXX are all callers checking an error */
unsigned long vm_mmap(struct file *file, unsigned long addr,
unsigned long len, unsigned long prot,
unsigned long flag, unsigned long offset)
@@ -316,7 +322,7 @@ unsigned long vm_mmap(struct file *file, unsigned long addr,
if (unlikely(offset_in_page(offset)))
return -EINVAL;
- return vm_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT);
+ return vm_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT, false);
}
EXPORT_SYMBOL(vm_mmap);
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