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authorMathieu Desnoyers <mathieu.desnoyers@efficios.com>2013-02-25 10:20:36 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2013-03-12 11:05:45 -0700
commit8aec0f5d4137532de14e6554fd5dd201ff3a3c49 (patch)
tree314f28e5ad96423c6983aec9270462d76c0bb343
parentc39ac49f23424086b43aceeace243f7a8bcc3ad8 (diff)
Fix: compat_rw_copy_check_uvector() misuse in aio, readv, writev, and security keys
Looking at mm/process_vm_access.c:process_vm_rw() and comparing it to compat_process_vm_rw() shows that the compatibility code requires an explicit "access_ok()" check before calling compat_rw_copy_check_uvector(). The same difference seems to appear when we compare fs/read_write.c:do_readv_writev() to fs/compat.c:compat_do_readv_writev(). This subtle difference between the compat and non-compat requirements should probably be debated, as it seems to be error-prone. In fact, there are two others sites that use this function in the Linux kernel, and they both seem to get it wrong: Now shifting our attention to fs/aio.c, we see that aio_setup_iocb() also ends up calling compat_rw_copy_check_uvector() through aio_setup_vectored_rw(). Unfortunately, the access_ok() check appears to be missing. Same situation for security/keys/compat.c:compat_keyctl_instantiate_key_iov(). I propose that we add the access_ok() check directly into compat_rw_copy_check_uvector(), so callers don't have to worry about it, and it therefore makes the compat call code similar to its non-compat counterpart. Place the access_ok() check in the same location where copy_from_user() can trigger a -EFAULT error in the non-compat code, so the ABI behaviors are alike on both compat and non-compat. While we are here, fix compat_do_readv_writev() so it checks for compat_rw_copy_check_uvector() negative return values. And also, fix a memory leak in compat_keyctl_instantiate_key_iov() error handling. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/compat.c15
-rw-r--r--mm/process_vm_access.c8
-rw-r--r--security/keys/compat.c4
3 files changed, 9 insertions, 18 deletions
diff --git a/fs/compat.c b/fs/compat.c
index fe40fde29111..d487985dd0ea 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -558,6 +558,10 @@ ssize_t compat_rw_copy_check_uvector(int type,
}
*ret_pointer = iov;
+ ret = -EFAULT;
+ if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
+ goto out;
+
/*
* Single unix specification:
* We should -EINVAL if an element length is not >= 0 and fitting an
@@ -1080,17 +1084,12 @@ static ssize_t compat_do_readv_writev(int type, struct file *file,
if (!file->f_op)
goto out;
- ret = -EFAULT;
- if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
- goto out;
-
- tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
+ ret = compat_rw_copy_check_uvector(type, uvector, nr_segs,
UIO_FASTIOV, iovstack, &iov);
- if (tot_len == 0) {
- ret = 0;
+ if (ret <= 0)
goto out;
- }
+ tot_len = ret;
ret = rw_verify_area(type, file, pos, tot_len);
if (ret < 0)
goto out;
diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c
index 926b46649749..fd26d0433509 100644
--- a/mm/process_vm_access.c
+++ b/mm/process_vm_access.c
@@ -429,12 +429,6 @@ compat_process_vm_rw(compat_pid_t pid,
if (flags != 0)
return -EINVAL;
- if (!access_ok(VERIFY_READ, lvec, liovcnt * sizeof(*lvec)))
- goto out;
-
- if (!access_ok(VERIFY_READ, rvec, riovcnt * sizeof(*rvec)))
- goto out;
-
if (vm_write)
rc = compat_rw_copy_check_uvector(WRITE, lvec, liovcnt,
UIO_FASTIOV, iovstack_l,
@@ -459,8 +453,6 @@ free_iovecs:
kfree(iov_r);
if (iov_l != iovstack_l)
kfree(iov_l);
-
-out:
return rc;
}
diff --git a/security/keys/compat.c b/security/keys/compat.c
index 1c261763f479..d65fa7fa29ba 100644
--- a/security/keys/compat.c
+++ b/security/keys/compat.c
@@ -40,12 +40,12 @@ static long compat_keyctl_instantiate_key_iov(
ARRAY_SIZE(iovstack),
iovstack, &iov);
if (ret < 0)
- return ret;
+ goto err;
if (ret == 0)
goto no_payload_free;
ret = keyctl_instantiate_key_common(id, iov, ioc, ret, ringid);
-
+err:
if (iov != iovstack)
kfree(iov);
return ret;