Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull trivial vfs updates from Al Viro:
 "A few cleanups + Neil's namespace_unlock() optimization"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  exec: make prepare_bprm_creds static
  genheaders: %-<width>s had been there since v6; %-*s - since v7
  VFS: use synchronize_rcu_expedited() in namespace_unlock()
  iov_iter: reduce code duplication

5 files changed, 38 insertions, 50 deletions

diff --git a/fs/exec.c b/fs/exec.c
index 44320d893f1a..fb72d36f7823 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1402,7 +1402,7 @@ EXPORT_SYMBOL(finalize_exec);
  * Or, if exec fails before, free_bprm() should release ->cred and
  * and unlock.
  */
-int prepare_bprm_creds(struct linux_binprm *bprm)
+static int prepare_bprm_creds(struct linux_binprm *bprm)
 {
         if (mutex_lock_interruptible(&current->signal->cred_guard_mutex))
                 return -ERESTARTNOINTR;
diff --git a/fs/namespace.c b/fs/namespace.c
index 97b7c7098c3d..9b0140e7d8da 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1360,7 +1360,7 @@ static void namespace_unlock(void)
         if (likely(hlist_empty(&head)))
                 return;
 
-        synchronize_rcu();
+        synchronize_rcu_expedited();
 
         group_pin_kill(&head);
 }
diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
index 03200a8c0178..688ab0de7810 100644
--- a/include/linux/binfmts.h
+++ b/include/linux/binfmts.h
@@ -139,7 +139,6 @@ extern int transfer_args_to_stack(struct linux_binprm *bprm,
 extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm);
 extern int copy_strings_kernel(int argc, const char *const *argv,
                                struct linux_binprm *bprm);
-extern int prepare_bprm_creds(struct linux_binprm *bprm);
 extern void install_exec_creds(struct linux_binprm *bprm);
 extern void set_binfmt(struct linux_binfmt *new);
 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t);
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index c93870987b58..be4bd627caf0 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -561,13 +561,20 @@ static size_t copy_pipe_to_iter(const void *addr, size_t bytes,
         return bytes;
 }
 
+static __wsum csum_and_memcpy(void *to, const void *from, size_t len,
+                              __wsum sum, size_t off)
+{
+        __wsum next = csum_partial_copy_nocheck(from, to, len, 0);
+        return csum_block_add(sum, next, off);
+}
+
 static size_t csum_and_copy_to_pipe_iter(const void *addr, size_t bytes,
                                 __wsum *csum, struct iov_iter *i)
 {
         struct pipe_inode_info *pipe = i->pipe;
         size_t n, r;
         size_t off = 0;
-        __wsum sum = *csum, next;
+        __wsum sum = *csum;
         int idx;
 
         if (!sanity(i))
@@ -579,8 +586,7 @@ static size_t csum_and_copy_to_pipe_iter(const void *addr, size_t bytes,
         for ( ; n; idx = next_idx(idx, pipe), r = 0) {
                 size_t chunk = min_t(size_t, n, PAGE_SIZE - r);
                 char *p = kmap_atomic(pipe->bufs[idx].page);
-                next = csum_partial_copy_nocheck(addr, p + r, chunk, 0);
-                sum = csum_block_add(sum, next, off);
+                sum = csum_and_memcpy(p + r, addr, chunk, sum, off);
                 kunmap_atomic(p);
                 i->idx = idx;
                 i->iov_offset = r + chunk;
@@ -1401,17 +1407,15 @@ size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum,
                 err ? v.iov_len : 0;
         }), ({
                 char *p = kmap_atomic(v.bv_page);
-                next = csum_partial_copy_nocheck(p + v.bv_offset,
-                                                 (to += v.bv_len) - v.bv_len,
-                                                 v.bv_len, 0);
+                sum = csum_and_memcpy((to += v.bv_len) - v.bv_len,
+                                      p + v.bv_offset, v.bv_len,
+                                      sum, off);
                 kunmap_atomic(p);
-                sum = csum_block_add(sum, next, off);
                 off += v.bv_len;
         }),({
-                next = csum_partial_copy_nocheck(v.iov_base,
-                                                 (to += v.iov_len) - v.iov_len,
-                                                 v.iov_len, 0);
-                sum = csum_block_add(sum, next, off);
+                sum = csum_and_memcpy((to += v.iov_len) - v.iov_len,
+                                      v.iov_base, v.iov_len,
+                                      sum, off);
                 off += v.iov_len;
         })
         )
@@ -1445,17 +1449,15 @@ bool csum_and_copy_from_iter_full(void *addr, size_t bytes, __wsum *csum,
                 0;
         }), ({
                 char *p = kmap_atomic(v.bv_page);
-                next = csum_partial_copy_nocheck(p + v.bv_offset,
-                                                 (to += v.bv_len) - v.bv_len,
-                                                 v.bv_len, 0);
+                sum = csum_and_memcpy((to += v.bv_len) - v.bv_len,
+                                      p + v.bv_offset, v.bv_len,
+                                      sum, off);
                 kunmap_atomic(p);
-                sum = csum_block_add(sum, next, off);
                 off += v.bv_len;
         }),({
-                next = csum_partial_copy_nocheck(v.iov_base,
-                                                 (to += v.iov_len) - v.iov_len,
-                                                 v.iov_len, 0);
-                sum = csum_block_add(sum, next, off);
+                sum = csum_and_memcpy((to += v.iov_len) - v.iov_len,
+                                      v.iov_base, v.iov_len,
+                                      sum, off);
                 off += v.iov_len;
         })
         )
@@ -1493,17 +1495,15 @@ size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *csump,
                 err ? v.iov_len : 0;
         }), ({
                 char *p = kmap_atomic(v.bv_page);
-                next = csum_partial_copy_nocheck((from += v.bv_len) - v.bv_len,
-                                                 p + v.bv_offset,
-                                                 v.bv_len, 0);
+                sum = csum_and_memcpy(p + v.bv_offset,
+                                      (from += v.bv_len) - v.bv_len,
+                                      v.bv_len, sum, off);
                 kunmap_atomic(p);
-                sum = csum_block_add(sum, next, off);
                 off += v.bv_len;
         }),({
-                next = csum_partial_copy_nocheck((from += v.iov_len) - v.iov_len,
-                                                 v.iov_base,
-                                                 v.iov_len, 0);
-                sum = csum_block_add(sum, next, off);
+                sum = csum_and_memcpy(v.iov_base,
+                                     (from += v.iov_len) - v.iov_len,
+                                     v.iov_len, sum, off);
                 off += v.iov_len;
         })
         )
diff --git a/scripts/selinux/genheaders/genheaders.c b/scripts/selinux/genheaders/genheaders.c
index fa48fabcb330..1ceedea847dd 100644
--- a/scripts/selinux/genheaders/genheaders.c
+++ b/scripts/selinux/genheaders/genheaders.c
@@ -19,8 +19,6 @@ struct security_class_mapping {
 #include "classmap.h"
 #include "initial_sid_to_string.h"
 
-#define max(x, y) (((int)(x) > (int)(y)) ? x : y)
-
 const char *progname;
 
 static void usage(void)
@@ -46,11 +44,9 @@ static char *stoupperx(const char *s)
 
 int main(int argc, char *argv[])
 {
-        int i, j, k;
+        int i, j;
         int isids_len;
         FILE *fout;
-        const char *needle = "SOCKET";
-        char *substr;
 
         progname = argv[0];
 
@@ -80,20 +76,14 @@ int main(int argc, char *argv[])
 
         for (i = 0; secclass_map[i].name; i++) {
                 struct security_class_mapping *map = &secclass_map[i];
-                fprintf(fout, "#define SECCLASS_%s", map->name);
-                for (j = 0; j < max(1, 40 - strlen(map->name)); j++)
-                        fprintf(fout, " ");
-                fprintf(fout, "%2d\n", i+1);
+                fprintf(fout, "#define SECCLASS_%-39s %2d\n", map->name, i+1);
         }
 
         fprintf(fout, "\n");
 
         for (i = 1; i < isids_len; i++) {
                 const char *s = initial_sid_to_string[i];
-                fprintf(fout, "#define SECINITSID_%s", s);
-                for (j = 0; j < max(1, 40 - strlen(s)); j++)
-                        fprintf(fout, " ");
-                fprintf(fout, "%2d\n", i);
+                fprintf(fout, "#define SECINITSID_%-39s %2d\n", s, i);
         }
         fprintf(fout, "\n#define SECINITSID_NUM %d\n", i-1);
         fprintf(fout, "\nstatic inline bool security_is_socket_class(u16 kern_tclass)\n");
@@ -101,9 +91,10 @@ int main(int argc, char *argv[])
         fprintf(fout, "\tbool sock = false;\n\n");
         fprintf(fout, "\tswitch (kern_tclass) {\n");
         for (i = 0; secclass_map[i].name; i++) {
+                static char s[] = "SOCKET";
                 struct security_class_mapping *map = &secclass_map[i];
-                substr = strstr(map->name, needle);
-                if (substr && strcmp(substr, needle) == 0)
+                int len = strlen(map->name), l = sizeof(s) - 1;
+                if (len >= l && memcmp(map->name + len - l, s, l) == 0)
                         fprintf(fout, "\tcase SECCLASS_%s:\n", map->name);
         }
         fprintf(fout, "\t\tsock = true;\n");
@@ -129,17 +120,15 @@ int main(int argc, char *argv[])
 
         for (i = 0; secclass_map[i].name; i++) {
                 struct security_class_mapping *map = &secclass_map[i];
+                int len = strlen(map->name);
                 for (j = 0; map->perms[j]; j++) {
                         if (j >= 32) {
                                 fprintf(stderr, "Too many permissions to fit into an access vector at (%s, %s).\n",
                                         map->name, map->perms[j]);
                                 exit(5);
                         }
-                        fprintf(fout, "#define %s__%s", map->name,
-                                map->perms[j]);
-                        for (k = 0; k < max(1, 40 - strlen(map->name) - strlen(map->perms[j])); k++)
-                                fprintf(fout, " ");
-                        fprintf(fout, "0x%08xU\n", (1<<j));
+                        fprintf(fout, "#define %s__%-*s 0x%08xU\n", map->name,
+                                39-len, map->perms[j], 1U<<j);
                 }
         }