Commit df5f8314 authored by Eric W. Biederman's avatar Eric W. Biederman Committed by Linus Torvalds
Browse files

proc: seqfile convert proc_pid_status to properly handle pid namespaces 



Currently we possibly lookup the pid in the wrong pid namespace.  So
seq_file convert proc_pid_status which ensures the proper pid namespaces is
passed in.

[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: build fix]
[akpm@linux-foundation.org: another build fix]
[akpm@linux-foundation.org: s390 build fix]
[akpm@linux-foundation.org: fix task_name() output]
[akpm@linux-foundation.org: fix nommu build]
Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
Cc: Andrew Morgan <morgan@kernel.org>
Cc: Serge Hallyn <serue@us.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: Paul Jackson <pj@sgi.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a56d3fc7

arch/s390/kernel/traps.c

+12 −12
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <linux/smp.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/seq_file.h>

#include <linux/delay.h>

#include <linux/module.h>

#include <linux/kdebug.h>
@@ -218,41 +219,40 @@ void show_registers(struct pt_regs *regs) 
}	



/* This is called from fs/proc/array.c */

char *task_show_regs(struct task_struct *task, char *buffer)

void task_show_regs(struct seq_file *m, struct task_struct *task)

{

	struct pt_regs *regs;



	regs = task_pt_regs(task);

	buffer += sprintf(buffer, "task: %p, ksp: %p\n",

	seq_printf(m, "task: %p, ksp: %p\n",

		       task, (void *)task->thread.ksp);

	buffer += sprintf(buffer, "User PSW : %p %p\n",

	seq_printf(m, "User PSW : %p %p\n",

		       (void *) regs->psw.mask, (void *)regs->psw.addr);



	buffer += sprintf(buffer, "User GPRS: " FOURLONG,

	seq_printf(m, "User GPRS: " FOURLONG,

			  regs->gprs[0], regs->gprs[1],

			  regs->gprs[2], regs->gprs[3]);

	buffer += sprintf(buffer, "           " FOURLONG,

	seq_printf(m, "           " FOURLONG,

			  regs->gprs[4], regs->gprs[5],

			  regs->gprs[6], regs->gprs[7]);

	buffer += sprintf(buffer, "           " FOURLONG,

	seq_printf(m, "           " FOURLONG,

			  regs->gprs[8], regs->gprs[9],

			  regs->gprs[10], regs->gprs[11]);

	buffer += sprintf(buffer, "           " FOURLONG,

	seq_printf(m, "           " FOURLONG,

			  regs->gprs[12], regs->gprs[13],

			  regs->gprs[14], regs->gprs[15]);

	buffer += sprintf(buffer, "User ACRS: %08x %08x %08x %08x\n",

	seq_printf(m, "User ACRS: %08x %08x %08x %08x\n",

			  task->thread.acrs[0], task->thread.acrs[1],

			  task->thread.acrs[2], task->thread.acrs[3]);

	buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",

	seq_printf(m, "           %08x %08x %08x %08x\n",

			  task->thread.acrs[4], task->thread.acrs[5],

			  task->thread.acrs[6], task->thread.acrs[7]);

	buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",

	seq_printf(m, "           %08x %08x %08x %08x\n",

			  task->thread.acrs[8], task->thread.acrs[9],

			  task->thread.acrs[10], task->thread.acrs[11]);

	buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",

	seq_printf(m, "           %08x %08x %08x %08x\n",

			  task->thread.acrs[12], task->thread.acrs[13],

			  task->thread.acrs[14], task->thread.acrs[15]);

	return buffer;

}



static DEFINE_SPINLOCK(die_lock);

fs/proc/array.c

+63 −65
Original line number Diff line number Diff line
@@ -89,18 +89,21 @@ 
do { memcpy(buffer, string, strlen(string)); \

     buffer += strlen(string); } while (0)



static inline char *task_name(struct task_struct *p, char *buf)

static inline void task_name(struct seq_file *m, struct task_struct *p)

{

	int i;

	char *buf, *end;

	char *name;

	char tcomm[sizeof(p->comm)];



	get_task_comm(tcomm, p);



	ADDBUF(buf, "Name:\t");

	seq_printf(m, "Name:\t");

	end = m->buf + m->size;

	buf = m->buf + m->count;

	name = tcomm;

	i = sizeof(tcomm);

	do {

	while (i && (buf < end)) {

		unsigned char c = *name;

		name++;

		i--;
@@ -108,20 +111,21 @@ static inline char *task_name(struct task_struct *p, char *buf) 
		if (!c)

			break;

		if (c == '\\') {

			buf[1] = c;

			buf += 2;

			buf++;

			if (buf < end)

				*buf++ = c;

			continue;

		}

		if (c == '\n') {

			buf[0] = '\\';

			buf[1] = 'n';

			buf += 2;

			*buf++ = '\\';

			if (buf < end)

				*buf++ = 'n';

			continue;

		}

		buf++;

	} while (i);

	*buf = '\n';

	return buf+1;

	}

	m->count = buf - m->buf;

	seq_printf(m, "\n");

}



/*
@@ -152,21 +156,20 @@ static inline const char *get_task_state(struct task_struct *tsk) 
	return *p;

}



static inline char *task_state(struct task_struct *p, char *buffer)

static inline void task_state(struct seq_file *m, struct pid_namespace *ns,

				struct pid *pid, struct task_struct *p)

{

	struct group_info *group_info;

	int g;

	struct fdtable *fdt = NULL;

	struct pid_namespace *ns;

	pid_t ppid, tpid;



	ns = current->nsproxy->pid_ns;

	rcu_read_lock();

	ppid = pid_alive(p) ?

		task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;

	tpid = pid_alive(p) && p->ptrace ?

		task_pid_nr_ns(rcu_dereference(p->parent), ns) : 0;

	buffer += sprintf(buffer,

	seq_printf(m,

		"State:\t%s\n"

		"Tgid:\t%d\n"

		"Pid:\t%d\n"
@@ -176,7 +179,7 @@ static inline char *task_state(struct task_struct *p, char *buffer) 
		"Gid:\t%d\t%d\t%d\t%d\n",

		get_task_state(p),

		task_tgid_nr_ns(p, ns),

		task_pid_nr_ns(p, ns),

		pid_nr_ns(pid, ns),

		ppid, tpid,

		p->uid, p->euid, p->suid, p->fsuid,

		p->gid, p->egid, p->sgid, p->fsgid);
@@ -184,7 +187,7 @@ static inline char *task_state(struct task_struct *p, char *buffer) 
	task_lock(p);

	if (p->files)

		fdt = files_fdtable(p->files);

	buffer += sprintf(buffer,

	seq_printf(m,

		"FDSize:\t%d\n"

		"Groups:\t",

		fdt ? fdt->max_fds : 0);
@@ -195,20 +198,18 @@ static inline char *task_state(struct task_struct *p, char *buffer) 
	task_unlock(p);



	for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)

		buffer += sprintf(buffer, "%d ", GROUP_AT(group_info, g));

		seq_printf(m, "%d ", GROUP_AT(group_info, g));

	put_group_info(group_info);



	buffer += sprintf(buffer, "\n");

	return buffer;

	seq_printf(m, "\n");

}



static char *render_sigset_t(const char *header, sigset_t *set, char *buffer)

static void render_sigset_t(struct seq_file *m, const char *header,

				sigset_t *set)

{

	int i, len;

	int i;



	len = strlen(header);

	memcpy(buffer, header, len);

	buffer += len;

	seq_printf(m, "%s", header);



	i = _NSIG;

	do {
@@ -219,12 +220,10 @@ static char *render_sigset_t(const char *header, sigset_t *set, char *buffer) 
		if (sigismember(set, i+2)) x |= 2;

		if (sigismember(set, i+3)) x |= 4;

		if (sigismember(set, i+4)) x |= 8;

		*buffer++ = (x < 10 ? '0' : 'a' - 10) + x;

		seq_printf(m, "%x", x);

	} while (i >= 4);



	*buffer++ = '\n';

	*buffer = 0;

	return buffer;

	seq_printf(m, "\n");

}



static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
@@ -242,7 +241,7 @@ static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign, 
	}

}



static inline char *task_sig(struct task_struct *p, char *buffer)

static inline void task_sig(struct seq_file *m, struct task_struct *p)

{

	unsigned long flags;

	sigset_t pending, shpending, blocked, ignored, caught;
@@ -269,67 +268,66 @@ static inline char *task_sig(struct task_struct *p, char *buffer) 
	}

	rcu_read_unlock();



	buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);

	buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim);

	seq_printf(m, "Threads:\t%d\n", num_threads);

	seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);



	/* render them all */

	buffer = render_sigset_t("SigPnd:\t", &pending, buffer);

	buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer);

	buffer = render_sigset_t("SigBlk:\t", &blocked, buffer);

	buffer = render_sigset_t("SigIgn:\t", &ignored, buffer);

	buffer = render_sigset_t("SigCgt:\t", &caught, buffer);



	return buffer;

	render_sigset_t(m, "SigPnd:\t", &pending);

	render_sigset_t(m, "ShdPnd:\t", &shpending);

	render_sigset_t(m, "SigBlk:\t", &blocked);

	render_sigset_t(m, "SigIgn:\t", &ignored);

	render_sigset_t(m, "SigCgt:\t", &caught);

}



static char *render_cap_t(const char *header, kernel_cap_t *a, char *buffer)

static void render_cap_t(struct seq_file *m, const char *header,

			kernel_cap_t *a)

{

	unsigned __capi;



	buffer += sprintf(buffer, "%s", header);

	seq_printf(m, "%s", header);

	CAP_FOR_EACH_U32(__capi) {

		buffer += sprintf(buffer, "%08x",

		seq_printf(m, "%08x",

			   a->cap[(_LINUX_CAPABILITY_U32S-1) - __capi]);

	}

	return buffer + sprintf(buffer, "\n");

	seq_printf(m, "\n");

}



static inline char *task_cap(struct task_struct *p, char *buffer)

static inline void task_cap(struct seq_file *m, struct task_struct *p)

{

	buffer = render_cap_t("CapInh:\t", &p->cap_inheritable, buffer);

	buffer = render_cap_t("CapPrm:\t", &p->cap_permitted, buffer);

	return render_cap_t("CapEff:\t", &p->cap_effective, buffer);

	render_cap_t(m, "CapInh:\t", &p->cap_inheritable);

	render_cap_t(m, "CapPrm:\t", &p->cap_permitted);

	render_cap_t(m, "CapEff:\t", &p->cap_effective);

}



static inline char *task_context_switch_counts(struct task_struct *p,

						char *buffer)

static inline void task_context_switch_counts(struct seq_file *m,

						struct task_struct *p)

{

	return buffer + sprintf(buffer, "voluntary_ctxt_switches:\t%lu\n"

	seq_printf(m,	"voluntary_ctxt_switches:\t%lu\n"

			"nonvoluntary_ctxt_switches:\t%lu\n",

			p->nvcsw,

			p->nivcsw);

}



int proc_pid_status(struct task_struct *task, char *buffer)

int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,

			struct pid *pid, struct task_struct *task)

{

	char *orig = buffer;

	struct mm_struct *mm = get_task_mm(task);



	buffer = task_name(task, buffer);

	buffer = task_state(task, buffer);

	task_name(m, task);

	task_state(m, ns, pid, task);



	if (mm) {

		buffer = task_mem(mm, buffer);

		task_mem(m, mm);

		mmput(mm);

	}

	buffer = task_sig(task, buffer);

	buffer = task_cap(task, buffer);

	buffer = cpuset_task_status_allowed(task, buffer);

	task_sig(m, task);

	task_cap(m, task);

	cpuset_task_status_allowed(m, task);

#if defined(CONFIG_S390)

	buffer = task_show_regs(task, buffer);

	task_show_regs(m, task);

#endif

	buffer = task_context_switch_counts(task, buffer);

	return buffer - orig;

	task_context_switch_counts(m, task);

	return 0;

}



/*

fs/proc/base.c

+2 −2
Original line number Diff line number Diff line
@@ -2274,7 +2274,7 @@ static const struct pid_entry tgid_base_stuff[] = { 
	DIR("fdinfo",     S_IRUSR|S_IXUSR, fdinfo),

	REG("environ",    S_IRUSR, environ),

	INF("auxv",       S_IRUSR, pid_auxv),

	INF("status",     S_IRUGO, pid_status),

	ONE("status",     S_IRUGO, pid_status),

	INF("limits",	  S_IRUSR, pid_limits),

#ifdef CONFIG_SCHED_DEBUG

	REG("sched",      S_IRUGO|S_IWUSR, pid_sched),
@@ -2605,7 +2605,7 @@ static const struct pid_entry tid_base_stuff[] = { 
	DIR("fdinfo",    S_IRUSR|S_IXUSR, fdinfo),

	REG("environ",   S_IRUSR, environ),

	INF("auxv",      S_IRUSR, pid_auxv),

	INF("status",    S_IRUGO, pid_status),

	ONE("status",    S_IRUGO, pid_status),

	INF("limits",	 S_IRUSR, pid_limits),

#ifdef CONFIG_SCHED_DEBUG

	REG("sched",     S_IRUGO|S_IWUSR, pid_sched),

fs/proc/internal.h

+2 −1
Original line number Diff line number Diff line
@@ -53,7 +53,8 @@ extern int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns, 
				struct pid *pid, struct task_struct *task);

extern int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,

				struct pid *pid, struct task_struct *task);

extern int proc_pid_status(struct task_struct *, char *);

extern int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,

				struct pid *pid, struct task_struct *task);

extern int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,

				struct pid *pid, struct task_struct *task);

extern loff_t mem_lseek(struct file *file, loff_t offset, int orig);

fs/proc/task_mmu.c

+3 −3
Original line number Diff line number Diff line
@@ -9,13 +9,14 @@ 
#include <linux/mempolicy.h>

#include <linux/swap.h>

#include <linux/swapops.h>

#include <linux/seq_file.h>



#include <asm/elf.h>

#include <asm/uaccess.h>

#include <asm/tlbflush.h>

#include "internal.h"



char *task_mem(struct mm_struct *mm, char *buffer)

void task_mem(struct seq_file *m, struct mm_struct *mm)

{

	unsigned long data, text, lib;

	unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
@@ -37,7 +38,7 @@ char *task_mem(struct mm_struct *mm, char *buffer) 
	data = mm->total_vm - mm->shared_vm - mm->stack_vm;

	text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;

	lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;

	buffer += sprintf(buffer,

	seq_printf(m,

		"VmPeak:\t%8lu kB\n"

		"VmSize:\t%8lu kB\n"

		"VmLck:\t%8lu kB\n"
@@ -56,7 +57,6 @@ char *task_mem(struct mm_struct *mm, char *buffer) 
		data << (PAGE_SHIFT-10),

		mm->stack_vm << (PAGE_SHIFT-10), text, lib,

		(PTRS_PER_PTE*sizeof(pte_t)*mm->nr_ptes) >> 10);

	return buffer;

}



unsigned long task_vsize(struct mm_struct *mm)

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