By checking the effective credentials instead of the real UID /
permitted capabilities, ensure that the calling process actually
intended to use its credentials.
To ensure that all ptrace checks use the correct caller
credentials (e.g. in case out-of-tree code or newly added code
omits the PTRACE_MODE_*CREDS flag), use two new flags and
require one of them to be set.
The problem was that when a privileged task had temporarily dropped
its privileges, e.g. by calling setreuid(0, user_uid), with the
intent to perform following syscalls with the credentials of
a user, it still passed ptrace access checks that the user would
not be able to pass.
While an attacker should not be able to convince the privileged
task to perform a ptrace() syscall, this is a problem because the
ptrace access check is reused for things in procfs.
In particular, the following somewhat interesting procfs entries
only rely on ptrace access checks:
/proc/$pid/stat - uses the check for determining whether pointers
should be visible, useful for bypassing ASLR
/proc/$pid/maps - also useful for bypassing ASLR
/proc/$pid/cwd - useful for gaining access to restricted
directories that contain files with lax permissions, e.g. in
this scenario:
lrwxrwxrwx root root /proc/13020/cwd -> /root/foobar
drwx------ root root /root
drwxr-xr-x root root /root/foobar
-rw-r--r-- root root /root/foobar/secret
Therefore, on a system where a root-owned mode 6755 binary
changes its effective credentials as described and then dumps a
user-specified file, this could be used by an attacker to reveal
the memory layout of root's processes or reveal the contents of
files he is not allowed to access (through /proc/$pid/cwd).
Signed-off-by: Jann Horn <jann@xxxxxxxxx>
---
fs/proc/array.c | 3 ++-
fs/proc/base.c | 24 ++++++++++++++----------
fs/proc/namespaces.c | 4 ++--
include/linux/ptrace.h | 17 ++++++++++++++++-
kernel/events/core.c | 2 +-
kernel/futex.c | 2 +-
kernel/futex_compat.c | 2 +-
kernel/kcmp.c | 6 ++++--
kernel/ptrace.c | 37 ++++++++++++++++++++++++++++++-------
mm/process_vm_access.c | 2 +-
security/commoncap.c | 7 ++++++-
11 files changed, 78 insertions(+), 28 deletions(-)
diff --git a/fs/proc/array.c b/fs/proc/array.c
index f60f012..00928c6 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -395,7 +395,8 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
state = *get_task_state(task);
vsize = eip = esp = 0;
- permitted = ptrace_may_access(task, PTRACE_MODE_READ | PTRACE_MODE_NOAUDIT);
+ permitted = ptrace_may_access(task,
+ PTRACE_MODE_READ | PTRACE_MODE_NOAUDIT | PTRACE_MODE_FSCREDS);
mm = get_task_mm(task);
if (mm) {
vsize = task_vsize(mm);
diff --git a/fs/proc/base.c b/fs/proc/base.c
index b25eee4..d6b9475 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -403,7 +403,8 @@ static const struct file_operations proc_pid_cmdline_ops = {
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);
+ struct mm_struct *mm = mm_access(task,
+ PTRACE_MODE_READ | PTRACE_MODE_FSCREDS);
if (mm && !IS_ERR(mm)) {
unsigned int nwords = 0;
do {
@@ -431,7 +432,8 @@ static int proc_pid_wchan(struct seq_file *m, struct pid_namespace *ns,
wchan = get_wchan(task);
if (lookup_symbol_name(wchan, symname) < 0) {
- if (!ptrace_may_access(task, PTRACE_MODE_READ))
+ if (!ptrace_may_access(task,
+ PTRACE_MODE_READ | PTRACE_MODE_FSCREDS))
return 0;
seq_printf(m, "%lu", wchan);
} else {
@@ -447,7 +449,8 @@ static int lock_trace(struct task_struct *task)
int err = mutex_lock_killable(&task->signal->cred_guard_mutex);
if (err)
return err;
- if (!ptrace_may_access(task, PTRACE_MODE_ATTACH)) {
+ if (!ptrace_may_access(task,
+ PTRACE_MODE_ATTACH | PTRACE_MODE_FSCREDS)) {
mutex_unlock(&task->signal->cred_guard_mutex);
return -EPERM;
}
@@ -700,7 +703,8 @@ static int proc_fd_access_allowed(struct inode *inode)
*/
task = get_proc_task(inode);
if (task) {
- allowed = ptrace_may_access(task, PTRACE_MODE_READ);
+ allowed = ptrace_may_access(task,
+ PTRACE_MODE_READ | PTRACE_MODE_FSCREDS);
put_task_struct(task);
}
return allowed;
@@ -735,7 +739,7 @@ static bool has_pid_permissions(struct pid_namespace *pid,
return true;
if (in_group_p(pid->pid_gid))
return true;
- return ptrace_may_access(task, PTRACE_MODE_READ);
+ return ptrace_may_access(task, PTRACE_MODE_READ | PTRACE_MODE_FSCREDS);
}
@@ -812,7 +816,7 @@ struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode)
struct mm_struct *mm = ERR_PTR(-ESRCH);
if (task) {
- mm = mm_access(task, mode);
+ mm = mm_access(task, mode | PTRACE_MODE_FSCREDS);
put_task_struct(task);
if (!IS_ERR_OR_NULL(mm)) {
@@ -1849,7 +1853,7 @@ static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags)
if (!task)
goto out_notask;
- mm = mm_access(task, PTRACE_MODE_READ);
+ mm = mm_access(task, PTRACE_MODE_READ | PTRACE_MODE_FSCREDS);
if (IS_ERR_OR_NULL(mm))
goto out;
@@ -2000,7 +2004,7 @@ static struct dentry *proc_map_files_lookup(struct inode *dir,
goto out;
result = -EACCES;
- if (!ptrace_may_access(task, PTRACE_MODE_READ))
+ if (!ptrace_may_access(task, PTRACE_MODE_READ | PTRACE_MODE_FSCREDS))
goto out_put_task;
result = -ENOENT;
@@ -2053,7 +2057,7 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
goto out;
ret = -EACCES;
- if (!ptrace_may_access(task, PTRACE_MODE_READ))
+ if (!ptrace_may_access(task, PTRACE_MODE_READ | PTRACE_MODE_FSCREDS))
goto out_put_task;
ret = 0;
@@ -2522,7 +2526,7 @@ static int do_io_accounting(struct task_struct *task, struct seq_file *m, int wh
if (result)
return result;
- if (!ptrace_may_access(task, PTRACE_MODE_READ)) {
+ if (!ptrace_may_access(task, PTRACE_MODE_READ | PTRACE_MODE_FSCREDS)) {
result = -EACCES;
goto out_unlock;
}
diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c
index f6e8354..0cbe012 100644
--- a/fs/proc/namespaces.c
+++ b/fs/proc/namespaces.c
@@ -42,7 +42,7 @@ static const char *proc_ns_follow_link(struct dentry *dentry, void **cookie)
if (!task)
return error;
- if (ptrace_may_access(task, PTRACE_MODE_READ)) {
+ if (ptrace_may_access(task, PTRACE_MODE_READ | PTRACE_MODE_FSCREDS)) {
error = ns_get_path(&ns_path, task, ns_ops);
if (!error)
nd_jump_link(&ns_path);
@@ -63,7 +63,7 @@ static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int bufl
if (!task)
return res;
- if (ptrace_may_access(task, PTRACE_MODE_READ)) {
+ if (ptrace_may_access(task, PTRACE_MODE_READ | PTRACE_MODE_FSCREDS)) {
res = ns_get_name(name, sizeof(name), task, ns_ops);
if (res >= 0)
res = readlink_copy(buffer, buflen, name);
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index 061265f..63f4a3c 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -57,7 +57,22 @@ extern void exit_ptrace(struct task_struct *tracer, struct list_head *dead);
#define PTRACE_MODE_READ 0x01
#define PTRACE_MODE_ATTACH 0x02
#define PTRACE_MODE_NOAUDIT 0x04
-/* Returns true on success, false on denial. */
+#define PTRACE_MODE_FSCREDS 0x08
+#define PTRACE_MODE_REALCREDS 0x10
+/**
+ * ptrace_may_access - check whether the caller is permitted to access
+ * a target task.
+ * @task: target task
+ * @mode: selects type of access and caller credentials
+ *
+ * Returns true on success, false on denial.
+ *
+ * One of the flags PTRACE_MODE_FSCREDS and PTRACE_MODE_REALCREDS must
+ * be set in @mode to specify whether the access was requested through
+ * a filesystem syscall (should use effective capabilities and fsuid
+ * of the caller) or through an explicit syscall such as
+ * process_vm_writev or ptrace (and should use the real credentials).
+ */
extern bool ptrace_may_access(struct task_struct *task, unsigned int mode);
static inline int ptrace_reparented(struct task_struct *child)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index b11756f..0decdf3 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3384,7 +3384,7 @@ find_lively_task_by_vpid(pid_t vpid)
/* Reuse ptrace permission checks for now. */
err = -EACCES;
- if (!ptrace_may_access(task, PTRACE_MODE_READ))
+ if (!ptrace_may_access(task, PTRACE_MODE_READ | PTRACE_MODE_REALCREDS))
goto errout;
return task;
diff --git a/kernel/futex.c b/kernel/futex.c
index 6e443ef..11e467e 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -2872,7 +2872,7 @@ SYSCALL_DEFINE3(get_robust_list, int, pid,
}
ret = -EPERM;
- if (!ptrace_may_access(p, PTRACE_MODE_READ))
+ if (!ptrace_may_access(p, PTRACE_MODE_READ | PTRACE_MODE_REALCREDS))
goto err_unlock;
head = p->robust_list;
diff --git a/kernel/futex_compat.c b/kernel/futex_compat.c
index 55c8c93..5596298 100644
--- a/kernel/futex_compat.c
+++ b/kernel/futex_compat.c
@@ -155,7 +155,7 @@ COMPAT_SYSCALL_DEFINE3(get_robust_list, int, pid,
}
ret = -EPERM;
- if (!ptrace_may_access(p, PTRACE_MODE_READ))
+ if (!ptrace_may_access(p, PTRACE_MODE_READ | PTRACE_MODE_REALCREDS))
goto err_unlock;
head = p->compat_robust_list;
diff --git a/kernel/kcmp.c b/kernel/kcmp.c
index 0aa69ea..4a568e4 100644
--- a/kernel/kcmp.c
+++ b/kernel/kcmp.c
@@ -122,8 +122,10 @@ SYSCALL_DEFINE5(kcmp, pid_t, pid1, pid_t, pid2, int, type,
&task2->signal->cred_guard_mutex);
if (ret)
goto err;
- if (!ptrace_may_access(task1, PTRACE_MODE_READ) ||
- !ptrace_may_access(task2, PTRACE_MODE_READ)) {
+ if (!ptrace_may_access(task1,
+ PTRACE_MODE_READ | PTRACE_MODE_REALCREDS) ||
+ !ptrace_may_access(task2,
+ PTRACE_MODE_READ | PTRACE_MODE_REALCREDS)) {
ret = -EPERM;
goto err_unlock;
}
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 787320d..28f007b 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -219,6 +219,13 @@ static int ptrace_has_cap(struct user_namespace *ns, unsigned int mode)
static int __ptrace_may_access(struct task_struct *task, unsigned int mode)
{
const struct cred *cred = current_cred(), *tcred;
+ kuid_t caller_uid;
+ kgid_t caller_gid;
+
+ if (!(mode & PTRACE_MODE_FSCREDS) != !(mode & PTRACE_MODE_REALCREDS)) {
+ WARN(1, "denying ptrace access check without PTRACE_MODE_*CREDS\n");
+ return -EPERM;
+ }
/* May we inspect the given task?
* This check is used both for attaching with ptrace
@@ -233,13 +240,28 @@ static int __ptrace_may_access(struct task_struct *task, unsigned int mode)
if (same_thread_group(task, current))
return 0;
rcu_read_lock();
+ if (mode & PTRACE_MODE_FSCREDS) {
+ caller_uid = cred->fsuid;
+ caller_gid = cred->fsgid;
+ } else {
+ /*
+ * Using the euid would make more sense here, but something
+ * in userland might rely on the old behavior, and this
+ * shouldn't be a security problem since
+ * PTRACE_MODE_REALCREDS implies that the caller explicitly
+ * used a syscall that requests access to another process
+ * (and not a filesystem syscall to procfs).
+ */
+ caller_uid = cred->uid;
+ caller_gid = cred->gid;
+ }
tcred = __task_cred(task);
- if (uid_eq(cred->uid, tcred->euid) &&
- uid_eq(cred->uid, tcred->suid) &&
- uid_eq(cred->uid, tcred->uid) &&
- gid_eq(cred->gid, tcred->egid) &&
- gid_eq(cred->gid, tcred->sgid) &&
- gid_eq(cred->gid, tcred->gid))
+ if (uid_eq(caller_uid, tcred->euid) &&
+ uid_eq(caller_uid, tcred->suid) &&
+ uid_eq(caller_uid, tcred->uid) &&
+ gid_eq(caller_gid, tcred->egid) &&
+ gid_eq(caller_gid, tcred->sgid) &&
+ gid_eq(caller_gid, tcred->gid))
goto ok;
if (ptrace_has_cap(tcred->user_ns, mode))
goto ok;
@@ -306,7 +328,8 @@ static int ptrace_attach(struct task_struct *task, long request,
goto out;
task_lock(task);
- retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH);
+ retval = __ptrace_may_access(task,
+ PTRACE_MODE_ATTACH | PTRACE_MODE_REALCREDS);
task_unlock(task);
if (retval)
goto unlock_creds;
diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c
index e88d071..a2be821 100644
--- a/mm/process_vm_access.c
+++ b/mm/process_vm_access.c
@@ -194,7 +194,7 @@ static ssize_t process_vm_rw_core(pid_t pid, struct iov_iter *iter,
goto free_proc_pages;
}
- mm = mm_access(task, PTRACE_MODE_ATTACH);
+ mm = mm_access(task, PTRACE_MODE_ATTACH | PTRACE_MODE_REALCREDS);
if (!mm || IS_ERR(mm)) {
rc = IS_ERR(mm) ? PTR_ERR(mm) : -ESRCH;
/*
diff --git a/security/commoncap.c b/security/commoncap.c
index 1832cf7..48071ed 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -137,12 +137,17 @@ int cap_ptrace_access_check(struct task_struct *child, unsigned int mode)
{
int ret = 0;
const struct cred *cred, *child_cred;
+ const kernel_cap_t *caller_caps;
rcu_read_lock();
cred = current_cred();
child_cred = __task_cred(child);
+ if (mode & PTRACE_MODE_FSCREDS)
+ caller_caps = &cred->cap_effective;
+ else
+ caller_caps = &cred->cap_permitted;
if (cred->user_ns == child_cred->user_ns &&
- cap_issubset(child_cred->cap_permitted, cred->cap_permitted))
+ cap_issubset(child_cred->cap_permitted, *caller_caps))
goto out;
if (ns_capable(child_cred->user_ns, CAP_SYS_PTRACE))
goto out;
--
2.1.4
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