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Diffstat (limited to 'fs/proc/base.c')
-rw-r--r--fs/proc/base.c117
1 files changed, 76 insertions, 41 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index ac0df4dde823..ca651ac00660 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -400,23 +400,6 @@ static const struct file_operations proc_pid_cmdline_ops = {
.llseek = generic_file_llseek,
};
-static int proc_pid_auxv(struct seq_file *m, struct pid_namespace *ns,
- struct pid *pid, struct task_struct *task)
-{
- struct mm_struct *mm = mm_access(task, PTRACE_MODE_READ_FSCREDS);
- if (mm && !IS_ERR(mm)) {
- unsigned int nwords = 0;
- do {
- nwords += 2;
- } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
- seq_write(m, mm->saved_auxv, nwords * sizeof(mm->saved_auxv[0]));
- mmput(mm);
- return 0;
- } else
- return PTR_ERR(mm);
-}
-
-
#ifdef CONFIG_KALLSYMS
/*
* Provides a wchan file via kallsyms in a proper one-value-per-file format.
@@ -483,7 +466,7 @@ static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
save_stack_trace_tsk(task, &trace);
for (i = 0; i < trace.nr_entries; i++) {
- seq_printf(m, "[<%pK>] %pS\n",
+ seq_printf(m, "[<%pK>] %pB\n",
(void *)entries[i], (void *)entries[i]);
}
unlock_trace(task);
@@ -709,7 +692,7 @@ int proc_setattr(struct dentry *dentry, struct iattr *attr)
if (attr->ia_valid & ATTR_MODE)
return -EPERM;
- error = inode_change_ok(inode, attr);
+ error = setattr_prepare(dentry, attr);
if (error)
return error;
@@ -849,6 +832,7 @@ static ssize_t mem_rw(struct file *file, char __user *buf,
unsigned long addr = *ppos;
ssize_t copied;
char *page;
+ unsigned int flags;
if (!mm)
return 0;
@@ -861,6 +845,11 @@ static ssize_t mem_rw(struct file *file, char __user *buf,
if (!atomic_inc_not_zero(&mm->mm_users))
goto free;
+ /* Maybe we should limit FOLL_FORCE to actual ptrace users? */
+ flags = FOLL_FORCE;
+ if (write)
+ flags |= FOLL_WRITE;
+
while (count > 0) {
int this_len = min_t(int, count, PAGE_SIZE);
@@ -869,7 +858,7 @@ static ssize_t mem_rw(struct file *file, char __user *buf,
break;
}
- this_len = access_remote_vm(mm, addr, page, this_len, write);
+ this_len = access_remote_vm(mm, addr, page, this_len, flags);
if (!this_len) {
if (!copied)
copied = -EIO;
@@ -981,8 +970,7 @@ static ssize_t environ_read(struct file *file, char __user *buf,
max_len = min_t(size_t, PAGE_SIZE, count);
this_len = min(max_len, this_len);
- retval = access_remote_vm(mm, (env_start + src),
- page, this_len, 0);
+ retval = access_remote_vm(mm, (env_start + src), page, this_len, 0);
if (retval <= 0) {
ret = retval;
@@ -1014,6 +1002,33 @@ static const struct file_operations proc_environ_operations = {
.release = mem_release,
};
+static int auxv_open(struct inode *inode, struct file *file)
+{
+ return __mem_open(inode, file, PTRACE_MODE_READ_FSCREDS);
+}
+
+static ssize_t auxv_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct mm_struct *mm = file->private_data;
+ unsigned int nwords = 0;
+
+ if (!mm)
+ return 0;
+ do {
+ nwords += 2;
+ } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
+ return simple_read_from_buffer(buf, count, ppos, mm->saved_auxv,
+ nwords * sizeof(mm->saved_auxv[0]));
+}
+
+static const struct file_operations proc_auxv_operations = {
+ .open = auxv_open,
+ .read = auxv_read,
+ .llseek = generic_file_llseek,
+ .release = mem_release,
+};
+
static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count,
loff_t *ppos)
{
@@ -1664,7 +1679,7 @@ struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *t
/* Common stuff */
ei = PROC_I(inode);
inode->i_ino = get_next_ino();
- inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
+ inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
inode->i_op = &proc_def_inode_operations;
/*
@@ -2280,16 +2295,27 @@ static ssize_t timerslack_ns_write(struct file *file, const char __user *buf,
if (!p)
return -ESRCH;
- if (ptrace_may_access(p, PTRACE_MODE_ATTACH_FSCREDS)) {
- task_lock(p);
- if (slack_ns == 0)
- p->timer_slack_ns = p->default_timer_slack_ns;
- else
- p->timer_slack_ns = slack_ns;
- task_unlock(p);
- } else
- count = -EPERM;
+ if (p != current) {
+ if (!capable(CAP_SYS_NICE)) {
+ count = -EPERM;
+ goto out;
+ }
+
+ err = security_task_setscheduler(p);
+ if (err) {
+ count = err;
+ goto out;
+ }
+ }
+
+ task_lock(p);
+ if (slack_ns == 0)
+ p->timer_slack_ns = p->default_timer_slack_ns;
+ else
+ p->timer_slack_ns = slack_ns;
+ task_unlock(p);
+out:
put_task_struct(p);
return count;
@@ -2299,19 +2325,28 @@ static int timerslack_ns_show(struct seq_file *m, void *v)
{
struct inode *inode = m->private;
struct task_struct *p;
- int err = 0;
+ int err = 0;
p = get_proc_task(inode);
if (!p)
return -ESRCH;
- if (ptrace_may_access(p, PTRACE_MODE_ATTACH_FSCREDS)) {
- task_lock(p);
- seq_printf(m, "%llu\n", p->timer_slack_ns);
- task_unlock(p);
- } else
- err = -EPERM;
+ if (p != current) {
+ if (!capable(CAP_SYS_NICE)) {
+ err = -EPERM;
+ goto out;
+ }
+ err = security_task_getscheduler(p);
+ if (err)
+ goto out;
+ }
+
+ task_lock(p);
+ seq_printf(m, "%llu\n", p->timer_slack_ns);
+ task_unlock(p);
+
+out:
put_task_struct(p);
return err;
@@ -2822,7 +2857,7 @@ static const struct pid_entry tgid_base_stuff[] = {
DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
#endif
REG("environ", S_IRUSR, proc_environ_operations),
- ONE("auxv", S_IRUSR, proc_pid_auxv),
+ REG("auxv", S_IRUSR, proc_auxv_operations),
ONE("status", S_IRUGO, proc_pid_status),
ONE("personality", S_IRUSR, proc_pid_personality),
ONE("limits", S_IRUGO, proc_pid_limits),
@@ -3210,7 +3245,7 @@ static const struct pid_entry tid_base_stuff[] = {
DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
#endif
REG("environ", S_IRUSR, proc_environ_operations),
- ONE("auxv", S_IRUSR, proc_pid_auxv),
+ REG("auxv", S_IRUSR, proc_auxv_operations),
ONE("status", S_IRUGO, proc_pid_status),
ONE("personality", S_IRUSR, proc_pid_personality),
ONE("limits", S_IRUGO, proc_pid_limits),
generated by cgit v1.2.3 (git 2.39.1) at 2025-05-02 23:50:32 +0000