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Date: Fri, 22 Feb 2019 13:53:16 +0100
From: Andrey Konovalov <andreyknvl@...gle.com>
To: Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Mark Rutland <mark.rutland@....com>,
Robin Murphy <robin.murphy@....com>,
Kees Cook <keescook@...omium.org>,
Kate Stewart <kstewart@...uxfoundation.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...nel.org>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
Shuah Khan <shuah@...nel.org>,
Vincenzo Frascino <vincenzo.frascino@....com>,
linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
linux-mm@...ck.org, linux-arch@...r.kernel.org,
linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Dmitry Vyukov <dvyukov@...gle.com>,
Kostya Serebryany <kcc@...gle.com>,
Evgeniy Stepanov <eugenis@...gle.com>,
Lee Smith <Lee.Smith@....com>,
Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
Jacob Bramley <Jacob.Bramley@....com>,
Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>,
Chintan Pandya <cpandya@...eaurora.org>,
Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
Dave Martin <Dave.Martin@....com>,
Kevin Brodsky <kevin.brodsky@....com>,
Szabolcs Nagy <Szabolcs.Nagy@....com>,
Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH v10 04/12] mm, arm64: untag user pointers passed to memory syscalls
This commit allows tagged pointers to be passed to the following memory
syscalls: madvise, mbind, get_mempolicy, mincore, mlock, mlock2, brk,
mmap_pgoff, old_mmap, munmap, remap_file_pages, mprotect, pkey_mprotect,
mremap, msync and shmdt.
Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
ipc/shm.c | 2 ++
mm/madvise.c | 2 ++
mm/mempolicy.c | 5 +++++
mm/migrate.c | 1 +
mm/mincore.c | 2 ++
mm/mlock.c | 5 +++++
mm/mmap.c | 7 +++++++
mm/mprotect.c | 2 ++
mm/mremap.c | 2 ++
mm/msync.c | 2 ++
10 files changed, 30 insertions(+)
diff --git a/ipc/shm.c b/ipc/shm.c
index 0842411cb0e9..f0fd9591d28f 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -1567,6 +1567,7 @@ SYSCALL_DEFINE3(shmat, int, shmid, char __user *, shmaddr, int, shmflg)
unsigned long ret;
long err;
+ shmaddr = untagged_addr(shmaddr);
err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA);
if (err)
return err;
@@ -1706,6 +1707,7 @@ long ksys_shmdt(char __user *shmaddr)
SYSCALL_DEFINE1(shmdt, char __user *, shmaddr)
{
+ shmaddr = untagged_addr(shmaddr);
return ksys_shmdt(shmaddr);
}
diff --git a/mm/madvise.c b/mm/madvise.c
index 21a7881a2db4..64e6d34a7f9b 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -809,6 +809,8 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
size_t len;
struct blk_plug plug;
+ start = untagged_addr(start);
+
if (!madvise_behavior_valid(behavior))
return error;
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index ee2bce59d2bf..0b5d5f794f4e 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1334,6 +1334,7 @@ static long kernel_mbind(unsigned long start, unsigned long len,
int err;
unsigned short mode_flags;
+ start = untagged_addr(start);
mode_flags = mode & MPOL_MODE_FLAGS;
mode &= ~MPOL_MODE_FLAGS;
if (mode >= MPOL_MAX)
@@ -1491,6 +1492,8 @@ static int kernel_get_mempolicy(int __user *policy,
int uninitialized_var(pval);
nodemask_t nodes;
+ addr = untagged_addr(addr);
+
if (nmask != NULL && maxnode < nr_node_ids)
return -EINVAL;
@@ -1576,6 +1579,8 @@ COMPAT_SYSCALL_DEFINE6(mbind, compat_ulong_t, start, compat_ulong_t, len,
unsigned long nr_bits, alloc_size;
nodemask_t bm;
+ start = untagged_addr(start);
+
nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES);
alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
diff --git a/mm/migrate.c b/mm/migrate.c
index d4fd680be3b0..b9f414e66af1 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1601,6 +1601,7 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
if (get_user(node, nodes + i))
goto out_flush;
addr = (unsigned long)p;
+ addr = untagged_addr(addr);
err = -ENODEV;
if (node < 0 || node >= MAX_NUMNODES)
diff --git a/mm/mincore.c b/mm/mincore.c
index 218099b5ed31..c4a3f4484b6b 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -228,6 +228,8 @@ SYSCALL_DEFINE3(mincore, unsigned long, start, size_t, len,
unsigned long pages;
unsigned char *tmp;
+ start = untagged_addr(start);
+
/* Check the start address: needs to be page-aligned.. */
if (start & ~PAGE_MASK)
return -EINVAL;
diff --git a/mm/mlock.c b/mm/mlock.c
index 41cc47e28ad6..8fa29e7c0e73 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -715,6 +715,7 @@ static __must_check int do_mlock(unsigned long start, size_t len, vm_flags_t fla
SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len)
{
+ start = untagged_addr(start);
return do_mlock(start, len, VM_LOCKED);
}
@@ -722,6 +723,8 @@ SYSCALL_DEFINE3(mlock2, unsigned long, start, size_t, len, int, flags)
{
vm_flags_t vm_flags = VM_LOCKED;
+ start = untagged_addr(start);
+
if (flags & ~MLOCK_ONFAULT)
return -EINVAL;
@@ -735,6 +738,8 @@ SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len)
{
int ret;
+ start = untagged_addr(start);
+
len = PAGE_ALIGN(len + (offset_in_page(start)));
start &= PAGE_MASK;
diff --git a/mm/mmap.c b/mm/mmap.c
index f901065c4c64..fc8e908a97ba 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -199,6 +199,8 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
bool downgraded = false;
LIST_HEAD(uf);
+ brk = untagged_addr(brk);
+
if (down_write_killable(&mm->mmap_sem))
return -EINTR;
@@ -1571,6 +1573,8 @@ unsigned long ksys_mmap_pgoff(unsigned long addr, unsigned long len,
struct file *file = NULL;
unsigned long retval;
+ addr = untagged_addr(addr);
+
if (!(flags & MAP_ANONYMOUS)) {
audit_mmap_fd(fd, flags);
file = fget(fd);
@@ -2869,6 +2873,7 @@ EXPORT_SYMBOL(vm_munmap);
SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len)
{
+ addr = untagged_addr(addr);
profile_munmap(addr);
return __vm_munmap(addr, len, true);
}
@@ -2887,6 +2892,8 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
unsigned long ret = -EINVAL;
struct file *file;
+ start = untagged_addr(start);
+
pr_warn_once("%s (%d) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.rst.\n",
current->comm, current->pid);
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 36cb358db170..9d79594dabee 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -578,6 +578,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
SYSCALL_DEFINE3(mprotect, unsigned long, start, size_t, len,
unsigned long, prot)
{
+ start = untagged_addr(start);
return do_mprotect_pkey(start, len, prot, -1);
}
@@ -586,6 +587,7 @@ SYSCALL_DEFINE3(mprotect, unsigned long, start, size_t, len,
SYSCALL_DEFINE4(pkey_mprotect, unsigned long, start, size_t, len,
unsigned long, prot, int, pkey)
{
+ start = untagged_addr(start);
return do_mprotect_pkey(start, len, prot, pkey);
}
diff --git a/mm/mremap.c b/mm/mremap.c
index 3320616ed93f..cd0e79c6ce63 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -588,6 +588,8 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
LIST_HEAD(uf_unmap_early);
LIST_HEAD(uf_unmap);
+ addr = untagged_addr(addr);
+
if (flags & ~(MREMAP_FIXED | MREMAP_MAYMOVE))
return ret;
diff --git a/mm/msync.c b/mm/msync.c
index ef30a429623a..c3bd3e75f687 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -37,6 +37,8 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
int unmapped_error = 0;
int error = -EINVAL;
+ start = untagged_addr(start);
+
if (flags & ~(MS_ASYNC | MS_INVALIDATE | MS_SYNC))
goto out;
if (offset_in_page(start))
--
2.21.0.rc0.258.g878e2cd30e-goog
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