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authorLinus Torvalds <torvalds@linux-foundation.org>2015-06-26 09:52:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-06-26 09:52:05 -0700
commit47a469421d792dcb91a1e73319d26134241953d2 (patch)
tree6a388381a434ebe87fed2fbb10a53ced7a7ce8b5 /fs
parentc13c81006314ad76c2b31824960a900385601b8b (diff)
parent51229b495340bd7a02ce3622d1966829b67054ea (diff)
Merge branch 'akpm' (patches from Andrew)
Merge second patchbomb from Andrew Morton: - most of the rest of MM - lots of misc things - procfs updates - printk feature work - updates to get_maintainer, MAINTAINERS, checkpatch - lib/ updates * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (96 commits) exit,stats: /* obey this comment */ coredump: add __printf attribute to cn_*printf functions coredump: use from_kuid/kgid when formatting corename fs/reiserfs: remove unneeded cast NILFS2: support NFSv2 export fs/befs/btree.c: remove unneeded initializations fs/minix: remove unneeded cast init/do_mounts.c: add create_dev() failure log kasan: remove duplicate definition of the macro KASAN_FREE_PAGE fs/efs: femove unneeded cast checkpatch: emit "NOTE: <types>" message only once after multiple files checkpatch: emit an error when there's a diff in a changelog checkpatch: validate MODULE_LICENSE content checkpatch: add multi-line handling for PREFER_ETHER_ADDR_COPY checkpatch: suggest using eth_zero_addr() and eth_broadcast_addr() checkpatch: fix processing of MEMSET issues checkpatch: suggest using ether_addr_equal*() checkpatch: avoid NOT_UNIFIED_DIFF errors on cover-letter.patch files checkpatch: remove local from codespell path checkpatch: add --showfile to allow input via pipe to show filenames ...
Diffstat (limited to 'fs')
-rw-r--r--fs/befs/btree.c6
-rw-r--r--fs/coredump.c19
-rw-r--r--fs/efs/super.c2
-rw-r--r--fs/ext4/super.c4
-rw-r--r--fs/jbd2/journal.c10
-rw-r--r--fs/minix/inode.c2
-rw-r--r--fs/nilfs2/namei.c5
-rw-r--r--fs/proc/Kconfig4
-rw-r--r--fs/proc/array.c4
-rw-r--r--fs/proc/base.c207
-rw-r--r--fs/reiserfs/super.c3
11 files changed, 227 insertions, 39 deletions
diff --git a/fs/befs/btree.c b/fs/befs/btree.c
index 0826e91dacda..22c166280883 100644
--- a/fs/befs/btree.c
+++ b/fs/befs/btree.c
@@ -137,8 +137,8 @@ static int
befs_bt_read_super(struct super_block *sb, befs_data_stream * ds,
befs_btree_super * sup)
{
- struct buffer_head *bh = NULL;
- befs_disk_btree_super *od_sup = NULL;
+ struct buffer_head *bh;
+ befs_disk_btree_super *od_sup;
befs_debug(sb, "---> %s", __func__);
@@ -250,7 +250,7 @@ int
befs_btree_find(struct super_block *sb, befs_data_stream * ds,
const char *key, befs_off_t * value)
{
- struct befs_btree_node *this_node = NULL;
+ struct befs_btree_node *this_node;
befs_btree_super bt_super;
befs_off_t node_off;
int res;
diff --git a/fs/coredump.c b/fs/coredump.c
index bbbe139ab280..e52e0064feac 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -70,7 +70,8 @@ static int expand_corename(struct core_name *cn, int size)
return 0;
}
-static int cn_vprintf(struct core_name *cn, const char *fmt, va_list arg)
+static __printf(2, 0) int cn_vprintf(struct core_name *cn, const char *fmt,
+ va_list arg)
{
int free, need;
va_list arg_copy;
@@ -93,7 +94,7 @@ again:
return -ENOMEM;
}
-static int cn_printf(struct core_name *cn, const char *fmt, ...)
+static __printf(2, 3) int cn_printf(struct core_name *cn, const char *fmt, ...)
{
va_list arg;
int ret;
@@ -105,7 +106,8 @@ static int cn_printf(struct core_name *cn, const char *fmt, ...)
return ret;
}
-static int cn_esc_printf(struct core_name *cn, const char *fmt, ...)
+static __printf(2, 3)
+int cn_esc_printf(struct core_name *cn, const char *fmt, ...)
{
int cur = cn->used;
va_list arg;
@@ -209,11 +211,15 @@ static int format_corename(struct core_name *cn, struct coredump_params *cprm)
break;
/* uid */
case 'u':
- err = cn_printf(cn, "%d", cred->uid);
+ err = cn_printf(cn, "%u",
+ from_kuid(&init_user_ns,
+ cred->uid));
break;
/* gid */
case 'g':
- err = cn_printf(cn, "%d", cred->gid);
+ err = cn_printf(cn, "%u",
+ from_kgid(&init_user_ns,
+ cred->gid));
break;
case 'd':
err = cn_printf(cn, "%d",
@@ -221,7 +227,8 @@ static int format_corename(struct core_name *cn, struct coredump_params *cprm)
break;
/* signal that caused the coredump */
case 's':
- err = cn_printf(cn, "%ld", cprm->siginfo->si_signo);
+ err = cn_printf(cn, "%d",
+ cprm->siginfo->si_signo);
break;
/* UNIX time of coredump */
case 't': {
diff --git a/fs/efs/super.c b/fs/efs/super.c
index 7fca462ea4e3..c8411a30f7da 100644
--- a/fs/efs/super.c
+++ b/fs/efs/super.c
@@ -67,7 +67,7 @@ static struct kmem_cache * efs_inode_cachep;
static struct inode *efs_alloc_inode(struct super_block *sb)
{
struct efs_inode_info *ei;
- ei = (struct efs_inode_info *)kmem_cache_alloc(efs_inode_cachep, GFP_KERNEL);
+ ei = kmem_cache_alloc(efs_inode_cachep, GFP_KERNEL);
if (!ei)
return NULL;
return &ei->vfs_inode;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index a7b4b6e10269..5c787647afe2 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3446,7 +3446,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
unsigned long journal_devnum = 0;
unsigned long def_mount_opts;
struct inode *root;
- char *cp;
const char *descr;
int ret = -ENOMEM;
int blocksize, clustersize;
@@ -3477,8 +3476,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
part_stat_read(sb->s_bdev->bd_part, sectors[1]);
/* Cleanup superblock name */
- for (cp = sb->s_id; (cp = strchr(cp, '/'));)
- *cp = '!';
+ strreplace(sb->s_id, '/', '!');
/* -EINVAL is default */
ret = -EINVAL;
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 179d7d8733f2..4ff3fad4e9e3 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1135,7 +1135,6 @@ journal_t * jbd2_journal_init_dev(struct block_device *bdev,
{
journal_t *journal = journal_init_common();
struct buffer_head *bh;
- char *p;
int n;
if (!journal)
@@ -1148,9 +1147,7 @@ journal_t * jbd2_journal_init_dev(struct block_device *bdev,
journal->j_blk_offset = start;
journal->j_maxlen = len;
bdevname(journal->j_dev, journal->j_devname);
- p = journal->j_devname;
- while ((p = strchr(p, '/')))
- *p = '!';
+ strreplace(journal->j_devname, '/', '!');
jbd2_stats_proc_init(journal);
n = journal->j_blocksize / sizeof(journal_block_tag_t);
journal->j_wbufsize = n;
@@ -1202,10 +1199,7 @@ journal_t * jbd2_journal_init_inode (struct inode *inode)
journal->j_dev = journal->j_fs_dev = inode->i_sb->s_bdev;
journal->j_inode = inode;
bdevname(journal->j_dev, journal->j_devname);
- p = journal->j_devname;
- while ((p = strchr(p, '/')))
- *p = '!';
- p = journal->j_devname + strlen(journal->j_devname);
+ p = strreplace(journal->j_devname, '/', '!');
sprintf(p, "-%lu", journal->j_inode->i_ino);
jbd_debug(1,
"journal %p: inode %s/%ld, size %Ld, bits %d, blksize %ld\n",
diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index 1182d1e26a9c..086cd0a61e80 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -62,7 +62,7 @@ static struct kmem_cache * minix_inode_cachep;
static struct inode *minix_alloc_inode(struct super_block *sb)
{
struct minix_inode_info *ei;
- ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
+ ei = kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
if (!ei)
return NULL;
return &ei->vfs_inode;
diff --git a/fs/nilfs2/namei.c b/fs/nilfs2/namei.c
index 22180836ec22..37dd6b05b1b5 100644
--- a/fs/nilfs2/namei.c
+++ b/fs/nilfs2/namei.c
@@ -496,8 +496,7 @@ static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
{
struct nilfs_fid *fid = (struct nilfs_fid *)fh;
- if ((fh_len != NILFS_FID_SIZE_NON_CONNECTABLE &&
- fh_len != NILFS_FID_SIZE_CONNECTABLE) ||
+ if (fh_len < NILFS_FID_SIZE_NON_CONNECTABLE ||
(fh_type != FILEID_NILFS_WITH_PARENT &&
fh_type != FILEID_NILFS_WITHOUT_PARENT))
return NULL;
@@ -510,7 +509,7 @@ static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
{
struct nilfs_fid *fid = (struct nilfs_fid *)fh;
- if (fh_len != NILFS_FID_SIZE_CONNECTABLE ||
+ if (fh_len < NILFS_FID_SIZE_CONNECTABLE ||
fh_type != FILEID_NILFS_WITH_PARENT)
return NULL;
diff --git a/fs/proc/Kconfig b/fs/proc/Kconfig
index 2183fcf41d59..d751fcb637bb 100644
--- a/fs/proc/Kconfig
+++ b/fs/proc/Kconfig
@@ -71,3 +71,7 @@ config PROC_PAGE_MONITOR
/proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
/proc/kpagecount, and /proc/kpageflags. Disabling these
interfaces will reduce the size of the kernel by approximately 4kb.
+
+config PROC_CHILDREN
+ bool "Include /proc/<pid>/task/<tid>/children file"
+ default n
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 3f57dac31ba6..ce065cf3104f 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -577,7 +577,7 @@ int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
return 0;
}
-#ifdef CONFIG_CHECKPOINT_RESTORE
+#ifdef CONFIG_PROC_CHILDREN
static struct pid *
get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
{
@@ -700,4 +700,4 @@ const struct file_operations proc_tid_children_operations = {
.llseek = seq_lseek,
.release = children_seq_release,
};
-#endif /* CONFIG_CHECKPOINT_RESTORE */
+#endif /* CONFIG_PROC_CHILDREN */
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 286a422f440e..1d540b3f226f 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -196,18 +196,205 @@ static int proc_root_link(struct dentry *dentry, struct path *path)
return result;
}
-static int proc_pid_cmdline(struct seq_file *m, struct pid_namespace *ns,
- struct pid *pid, struct task_struct *task)
+static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf,
+ size_t _count, loff_t *pos)
{
+ struct task_struct *tsk;
+ struct mm_struct *mm;
+ char *page;
+ unsigned long count = _count;
+ unsigned long arg_start, arg_end, env_start, env_end;
+ unsigned long len1, len2, len;
+ unsigned long p;
+ char c;
+ ssize_t rv;
+
+ BUG_ON(*pos < 0);
+
+ tsk = get_proc_task(file_inode(file));
+ if (!tsk)
+ return -ESRCH;
+ mm = get_task_mm(tsk);
+ put_task_struct(tsk);
+ if (!mm)
+ return 0;
+ /* Check if process spawned far enough to have cmdline. */
+ if (!mm->env_end) {
+ rv = 0;
+ goto out_mmput;
+ }
+
+ page = (char *)__get_free_page(GFP_TEMPORARY);
+ if (!page) {
+ rv = -ENOMEM;
+ goto out_mmput;
+ }
+
+ down_read(&mm->mmap_sem);
+ arg_start = mm->arg_start;
+ arg_end = mm->arg_end;
+ env_start = mm->env_start;
+ env_end = mm->env_end;
+ up_read(&mm->mmap_sem);
+
+ BUG_ON(arg_start > arg_end);
+ BUG_ON(env_start > env_end);
+
+ len1 = arg_end - arg_start;
+ len2 = env_end - env_start;
+
/*
- * Rely on struct seq_operations::show() being called once
- * per internal buffer allocation. See single_open(), traverse().
+ * Inherently racy -- command line shares address space
+ * with code and data.
*/
- BUG_ON(m->size < PAGE_SIZE);
- m->count += get_cmdline(task, m->buf, PAGE_SIZE);
- return 0;
+ rv = access_remote_vm(mm, arg_end - 1, &c, 1, 0);
+ if (rv <= 0)
+ goto out_free_page;
+
+ rv = 0;
+
+ if (c == '\0') {
+ /* Command line (set of strings) occupies whole ARGV. */
+ if (len1 <= *pos)
+ goto out_free_page;
+
+ p = arg_start + *pos;
+ len = len1 - *pos;
+ while (count > 0 && len > 0) {
+ unsigned int _count;
+ int nr_read;
+
+ _count = min3(count, len, PAGE_SIZE);
+ nr_read = access_remote_vm(mm, p, page, _count, 0);
+ if (nr_read < 0)
+ rv = nr_read;
+ if (nr_read <= 0)
+ goto out_free_page;
+
+ if (copy_to_user(buf, page, nr_read)) {
+ rv = -EFAULT;
+ goto out_free_page;
+ }
+
+ p += nr_read;
+ len -= nr_read;
+ buf += nr_read;
+ count -= nr_read;
+ rv += nr_read;
+ }
+ } else {
+ /*
+ * Command line (1 string) occupies ARGV and maybe
+ * extends into ENVP.
+ */
+ if (len1 + len2 <= *pos)
+ goto skip_argv_envp;
+ if (len1 <= *pos)
+ goto skip_argv;
+
+ p = arg_start + *pos;
+ len = len1 - *pos;
+ while (count > 0 && len > 0) {
+ unsigned int _count, l;
+ int nr_read;
+ bool final;
+
+ _count = min3(count, len, PAGE_SIZE);
+ nr_read = access_remote_vm(mm, p, page, _count, 0);
+ if (nr_read < 0)
+ rv = nr_read;
+ if (nr_read <= 0)
+ goto out_free_page;
+
+ /*
+ * Command line can be shorter than whole ARGV
+ * even if last "marker" byte says it is not.
+ */
+ final = false;
+ l = strnlen(page, nr_read);
+ if (l < nr_read) {
+ nr_read = l;
+ final = true;
+ }
+
+ if (copy_to_user(buf, page, nr_read)) {
+ rv = -EFAULT;
+ goto out_free_page;
+ }
+
+ p += nr_read;
+ len -= nr_read;
+ buf += nr_read;
+ count -= nr_read;
+ rv += nr_read;
+
+ if (final)
+ goto out_free_page;
+ }
+skip_argv:
+ /*
+ * Command line (1 string) occupies ARGV and
+ * extends into ENVP.
+ */
+ if (len1 <= *pos) {
+ p = env_start + *pos - len1;
+ len = len1 + len2 - *pos;
+ } else {
+ p = env_start;
+ len = len2;
+ }
+ while (count > 0 && len > 0) {
+ unsigned int _count, l;
+ int nr_read;
+ bool final;
+
+ _count = min3(count, len, PAGE_SIZE);
+ nr_read = access_remote_vm(mm, p, page, _count, 0);
+ if (nr_read < 0)
+ rv = nr_read;
+ if (nr_read <= 0)
+ goto out_free_page;
+
+ /* Find EOS. */
+ final = false;
+ l = strnlen(page, nr_read);
+ if (l < nr_read) {
+ nr_read = l;
+ final = true;
+ }
+
+ if (copy_to_user(buf, page, nr_read)) {
+ rv = -EFAULT;
+ goto out_free_page;
+ }
+
+ p += nr_read;
+ len -= nr_read;
+ buf += nr_read;
+ count -= nr_read;
+ rv += nr_read;
+
+ if (final)
+ goto out_free_page;
+ }
+skip_argv_envp:
+ ;
+ }
+
+out_free_page:
+ free_page((unsigned long)page);
+out_mmput:
+ mmput(mm);
+ if (rv > 0)
+ *pos += rv;
+ return rv;
}
+static const struct file_operations proc_pid_cmdline_ops = {
+ .read = proc_pid_cmdline_read,
+ .llseek = generic_file_llseek,
+};
+
static int proc_pid_auxv(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task)
{
@@ -2572,7 +2759,7 @@ static const struct pid_entry tgid_base_stuff[] = {
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
ONE("syscall", S_IRUSR, proc_pid_syscall),
#endif
- ONE("cmdline", S_IRUGO, proc_pid_cmdline),
+ REG("cmdline", S_IRUGO, proc_pid_cmdline_ops),
ONE("stat", S_IRUGO, proc_tgid_stat),
ONE("statm", S_IRUGO, proc_pid_statm),
REG("maps", S_IRUGO, proc_pid_maps_operations),
@@ -2918,11 +3105,11 @@ static const struct pid_entry tid_base_stuff[] = {
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
ONE("syscall", S_IRUSR, proc_pid_syscall),
#endif
- ONE("cmdline", S_IRUGO, proc_pid_cmdline),
+ REG("cmdline", S_IRUGO, proc_pid_cmdline_ops),
ONE("stat", S_IRUGO, proc_tid_stat),
ONE("statm", S_IRUGO, proc_pid_statm),
REG("maps", S_IRUGO, proc_tid_maps_operations),
-#ifdef CONFIG_CHECKPOINT_RESTORE
+#ifdef CONFIG_PROC_CHILDREN
REG("children", S_IRUGO, proc_tid_children_operations),
#endif
#ifdef CONFIG_NUMA
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index 3e0af317fcc3..0e4cf728126f 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -589,8 +589,7 @@ static struct kmem_cache *reiserfs_inode_cachep;
static struct inode *reiserfs_alloc_inode(struct super_block *sb)
{
struct reiserfs_inode_info *ei;
- ei = (struct reiserfs_inode_info *)
- kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
+ ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
if (!ei)
return NULL;
atomic_set(&ei->openers, 0);