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[PATCH] remove duplicated code from proc and ptrace

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Extract common code used by ptrace_attach() and may_ptrace_attach()
into a separate function.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Cc: <viro@parcelfarce.linux.theplanet.co.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Miklos Szeredi 2005-09-06 15:18:24 -07:00 committed by Linus Torvalds
parent 5e21ccb136
commit ab8d11beb4
3 changed files with 33 additions and 44 deletions
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35
fs/proc/base.c
View file

@ -346,33 +346,6 @@ static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vf
(task->state == TASK_STOPPED || task->state == TASK_TRACED) && \
security_ptrace(current,task) == 0))
static int may_ptrace_attach(struct task_struct *task)
{
int retval = 0;
task_lock(task);
if (!task->mm)
goto out;
if (((current->uid != task->euid) ||
(current->uid != task->suid) ||
(current->uid != task->uid) ||
(current->gid != task->egid) ||
(current->gid != task->sgid) ||
(current->gid != task->gid)) && !capable(CAP_SYS_PTRACE))
goto out;
rmb();
if (task->mm->dumpable != 1 && !capable(CAP_SYS_PTRACE))
goto out;
if (security_ptrace(current, task))
goto out;
retval = 1;
out:
task_unlock(task);
return retval;
}
static int proc_pid_environ(struct task_struct *task, char * buffer)
{
int res = 0;
@ -382,7 +355,7 @@ static int proc_pid_environ(struct task_struct *task, char * buffer)
if (len > PAGE_SIZE)
len = PAGE_SIZE;
res = access_process_vm(task, mm->env_start, buffer, len, 0);
if (!may_ptrace_attach(task))
if (!ptrace_may_attach(task))
res = -ESRCH;
mmput(mm);
}
@ -685,7 +658,7 @@ static ssize_t mem_read(struct file * file, char __user * buf,
int ret = -ESRCH;
struct mm_struct *mm;
if (!MAY_PTRACE(task) || !may_ptrace_attach(task))
if (!MAY_PTRACE(task) || !ptrace_may_attach(task))
goto out;
ret = -ENOMEM;
@ -711,7 +684,7 @@ static ssize_t mem_read(struct file * file, char __user * buf,
this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
retval = access_process_vm(task, src, page, this_len, 0);
if (!retval || !MAY_PTRACE(task) || !may_ptrace_attach(task)) {
if (!retval || !MAY_PTRACE(task) || !ptrace_may_attach(task)) {
if (!ret)
ret = -EIO;
break;
@ -749,7 +722,7 @@ static ssize_t mem_write(struct file * file, const char * buf,
struct task_struct *task = proc_task(file->f_dentry->d_inode);
unsigned long dst = *ppos;
if (!MAY_PTRACE(task) || !may_ptrace_attach(task))
if (!MAY_PTRACE(task) || !ptrace_may_attach(task))
return -ESRCH;
page = (char *)__get_free_page(GFP_USER);

1
include/linux/ptrace.h
View file

@ -90,6 +90,7 @@ extern void __ptrace_link(struct task_struct *child,
struct task_struct *new_parent);
extern void __ptrace_unlink(struct task_struct *child);
extern void ptrace_untrace(struct task_struct *child);
extern int ptrace_may_attach(struct task_struct *task);
static inline void ptrace_link(struct task_struct *child,
struct task_struct *new_parent)

41
kernel/ptrace.c
View file

@ -118,6 +118,33 @@ int ptrace_check_attach(struct task_struct *child, int kill)
return ret;
}
static int may_attach(struct task_struct *task)
{
if (!task->mm)
return -EPERM;
if (((current->uid != task->euid) ||
(current->uid != task->suid) ||
(current->uid != task->uid) ||
(current->gid != task->egid) ||
(current->gid != task->sgid) ||
(current->gid != task->gid)) && !capable(CAP_SYS_PTRACE))
return -EPERM;
smp_rmb();
if (!task->mm->dumpable && !capable(CAP_SYS_PTRACE))
return -EPERM;
return security_ptrace(current, task);
}
int ptrace_may_attach(struct task_struct *task)
{
int err;
task_lock(task);
err = may_attach(task);
task_unlock(task);
return !err;
}
int ptrace_attach(struct task_struct *task)
{
int retval;
@ -127,22 +154,10 @@ int ptrace_attach(struct task_struct *task)
goto bad;
if (task == current)
goto bad;
if (!task->mm)
goto bad;
if(((current->uid != task->euid) ||
(current->uid != task->suid) ||
(current->uid != task->uid) ||
(current->gid != task->egid) ||
(current->gid != task->sgid) ||
(current->gid != task->gid)) && !capable(CAP_SYS_PTRACE))
goto bad;
smp_rmb();
if (!task->mm->dumpable && !capable(CAP_SYS_PTRACE))
goto bad;
/* the same process cannot be attached many times */
if (task->ptrace & PT_PTRACED)
goto bad;
retval = security_ptrace(current, task);
retval = may_attach(task);
if (retval)
goto bad;