[PATCH 11/19] y2038: introduce and use struct __kernel_rusage
From: Arnd Bergmann
Date: Wed May 06 2015 - 12:30:59 EST
'struct rusage' is not compatible with user space that defines time_t
as 64-bit. While there will never be an overflow of the timeval
members in this structure, the current definition breaks any program
that relies on the member to be a timeval.
This introduces a new struct __kernel_rusage that is defined to match
the 64-bit version of struct rusage. 32-bit architectures that use
CONFIG_COMPAT_TIME can then use compat_sys_getrusage() etc to get
the original structure, while the normal sys_getrusage() function
will provide the new layout in both native and compat32 mode.
On 32-bit architectures that do not set CONFIG_COMPAT_TIME, as well
as all 64-bit architectures, this patch is intented to have no
user-visible impact.
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
arch/alpha/kernel/osf_sys.c | 4 ++--
include/linux/compat_time.h | 3 +--
include/linux/resource.h | 8 ++++++--
include/linux/syscalls.h | 7 +++----
include/uapi/linux/resource.h | 32 ++++++++++++++++++++++++++++++++
kernel/compat.c | 42 +++++++++++++++++++++++++++++++++++++-----
kernel/exit.c | 6 +++---
kernel/sys.c | 23 ++++++++++++++---------
8 files changed, 98 insertions(+), 27 deletions(-)
diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index e51f578636a5..6824e68d32ad 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -1166,7 +1166,7 @@ SYSCALL_DEFINE2(osf_getrusage, int, who, struct rusage32 __user *, ru)
SYSCALL_DEFINE4(osf_wait4, pid_t, pid, int __user *, ustatus, int, options,
struct rusage32 __user *, ur)
{
- struct rusage r;
+ struct __kernel_rusage r;
long ret, err;
unsigned int status = 0;
mm_segment_t old_fs;
@@ -1178,7 +1178,7 @@ SYSCALL_DEFINE4(osf_wait4, pid_t, pid, int __user *, ustatus, int, options,
set_fs (KERNEL_DS);
ret = sys_wait4(pid, (unsigned int __user *) &status, options,
- (struct rusage __user *) &r);
+ (struct __kernel_rusage __user *) &r);
set_fs (old_fs);
if (!access_ok(VERIFY_WRITE, ur, sizeof(*ur)))
diff --git a/include/linux/compat_time.h b/include/linux/compat_time.h
index 789b6415e90e..e3b43bd79801 100644
--- a/include/linux/compat_time.h
+++ b/include/linux/compat_time.h
@@ -141,8 +141,7 @@ struct compat_rusage {
compat_long_t ru_nivcsw;
};
-struct rusage;
-extern int put_compat_rusage(const struct rusage *,
+extern int put_compat_rusage(const struct __kernel_rusage *,
struct compat_rusage __user *);
static inline int compat_timeval_compare(struct compat_timeval *lhs,
diff --git a/include/linux/resource.h b/include/linux/resource.h
index 5bc3116e649c..8cdecf204607 100644
--- a/include/linux/resource.h
+++ b/include/linux/resource.h
@@ -1,12 +1,16 @@
#ifndef _LINUX_RESOURCE_H
#define _LINUX_RESOURCE_H
-#include <uapi/linux/resource.h>
+#ifndef CONFIG_COMPAT_TIME
+#define __kernel_rusage rusage
+#endif
+#include <uapi/linux/resource.h>
struct task_struct;
-int getrusage(struct task_struct *p, int who, struct rusage __user *ru);
+int getrusage(struct task_struct *p, int who,
+ struct __kernel_rusage __user *ru);
int do_prlimit(struct task_struct *tsk, unsigned int resource,
struct rlimit *new_rlim, struct rlimit *old_rlim);
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 71b574b0365e..f3fdc312627b 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -36,7 +36,6 @@ struct old_utsname;
struct pollfd;
struct rlimit;
struct rlimit64;
-struct rusage;
struct sched_param;
struct sched_attr;
struct sel_arg_struct;
@@ -325,10 +324,10 @@ asmlinkage long sys_kexec_file_load(int kernel_fd, int initrd_fd,
asmlinkage long sys_exit(int error_code);
asmlinkage long sys_exit_group(int error_code);
asmlinkage long sys_wait4(pid_t pid, int __user *stat_addr,
- int options, struct rusage __user *ru);
+ int options, struct __kernel_rusage __user *ru);
asmlinkage long sys_waitid(int which, pid_t pid,
struct siginfo __user *infop,
- int options, struct rusage __user *ru);
+ int options, struct __kernel_rusage __user *ru);
asmlinkage long sys_waitpid(pid_t pid, int __user *stat_addr, int options);
asmlinkage long sys_set_tid_address(int __user *tidptr);
asmlinkage long sys_futex(u32 __user *uaddr, int op, u32 val,
@@ -650,7 +649,7 @@ asmlinkage long sys_setrlimit(unsigned int resource,
asmlinkage long sys_prlimit64(pid_t pid, unsigned int resource,
const struct rlimit64 __user *new_rlim,
struct rlimit64 __user *old_rlim);
-asmlinkage long sys_getrusage(int who, struct rusage __user *ru);
+asmlinkage long sys_getrusage(int who, struct __kernel_rusage __user *ru);
asmlinkage long sys_umask(int mask);
asmlinkage long sys_msgget(key_t key, int msgflg);
diff --git a/include/uapi/linux/resource.h b/include/uapi/linux/resource.h
index 36fb3b5fb181..c4f3ba44db00 100644
--- a/include/uapi/linux/resource.h
+++ b/include/uapi/linux/resource.h
@@ -39,6 +39,38 @@ struct rusage {
__kernel_long_t ru_nivcsw; /* involuntary " */
};
+
+/*
+ * __kernel_rusage replaces rusage, and matches the layout of 64-bit rusage
+ * on both 32-bit and 64-bit machines, to let 32-bit user space migrate to
+ * 64-bit tv_sec.
+ */
+#ifndef __kernel_rusage
+struct __kernel_rusage_timeval {
+ __s64 tv_sec;
+ __s64 tv_usec;
+};
+
+struct __kernel_rusage {
+ struct __kernel_rusage_timeval ru_utime; /* user time used */
+ struct __kernel_rusage_timeval ru_stime; /* system time used */
+ __s64 ru_maxrss; /* maximum resident set size */
+ __s64 ru_ixrss; /* integral shared memory size */
+ __s64 ru_idrss; /* integral unshared data size */
+ __s64 ru_isrss; /* integral unshared stack size */
+ __s64 ru_minflt; /* page reclaims */
+ __s64 ru_majflt; /* page faults */
+ __s64 ru_nswap; /* swaps */
+ __s64 ru_inblock; /* block input operations */
+ __s64 ru_oublock; /* block output operations */
+ __s64 ru_msgsnd; /* messages sent */
+ __s64 ru_msgrcv; /* messages received */
+ __s64 ru_nsignals; /* signals received */
+ __s64 ru_nvcsw; /* voluntary context switches */
+ __s64 ru_nivcsw; /* involuntary " */
+};
+#endif
+
struct rlimit {
__kernel_ulong_t rlim_cur;
__kernel_ulong_t rlim_max;
diff --git a/kernel/compat.c b/kernel/compat.c
index 03bb63995027..e56ee6a23c0f 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -517,7 +517,7 @@ COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource,
#endif
#ifdef CONFIG_COMPAT_TIME
-int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
+int put_compat_rusage(const struct __kernel_rusage *r, struct compat_rusage __user *ru)
{
if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
__put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
@@ -551,7 +551,7 @@ COMPAT_SYSCALL_DEFINE4(wait4,
if (!ru) {
return sys_wait4(pid, stat_addr, options, NULL);
} else {
- struct rusage r;
+ struct __kernel_rusage r;
int ret;
unsigned int status;
mm_segment_t old_fs = get_fs();
@@ -560,7 +560,7 @@ COMPAT_SYSCALL_DEFINE4(wait4,
ret = sys_wait4(pid,
(stat_addr ?
(unsigned int __user *) &status : NULL),
- options, (struct rusage __user *) &r);
+ options, (struct __kernel_rusage __user *) &r);
set_fs (old_fs);
if (ret > 0) {
@@ -579,7 +579,7 @@ COMPAT_SYSCALL_DEFINE5(waitid,
struct compat_rusage __user *, uru)
{
siginfo_t info;
- struct rusage ru;
+ struct __kernel_rusage ru;
long ret;
mm_segment_t old_fs = get_fs();
@@ -587,7 +587,7 @@ COMPAT_SYSCALL_DEFINE5(waitid,
set_fs(KERNEL_DS);
ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
- uru ? (struct rusage __user *)&ru : NULL);
+ uru ? (struct __kernel_rusage __user *)&ru : NULL);
set_fs(old_fs);
if ((ret < 0) || (info.si_signo == 0))
@@ -610,6 +610,38 @@ COMPAT_SYSCALL_DEFINE5(waitid,
#endif
#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE5(waitid_time64,
+ int, which, compat_pid_t, pid,
+ struct compat_siginfo __user *, uinfo, int, options,
+ struct compat_rusage __user *, uru)
+{
+ siginfo_t info;
+ struct __kernel_rusage ru;
+ long ret;
+ mm_segment_t old_fs = get_fs();
+
+ memset(&info, 0, sizeof(info));
+
+ set_fs(KERNEL_DS);
+ ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
+ uru ? (struct __kernel_rusage __user *)&ru : NULL);
+ set_fs(old_fs);
+
+ if ((ret < 0) || (info.si_signo == 0))
+ return ret;
+
+ if (uru) {
+ /* sys_waitid() overwrites everything in ru */
+ ret = copy_to_user(uru, &ru, sizeof(ru));
+ if (ret)
+ return -EFAULT;
+ }
+
+ BUG_ON(info.si_code & __SI_MASK);
+ info.si_code |= __SI_CHLD;
+ return copy_siginfo_to_user32(uinfo, &info);
+}
+
static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
unsigned len, struct cpumask *new_mask)
{
diff --git a/kernel/exit.c b/kernel/exit.c
index 22fcc05dec40..bf2de12e6ae1 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -894,7 +894,7 @@ struct wait_opts {
struct siginfo __user *wo_info;
int __user *wo_stat;
- struct rusage __user *wo_rusage;
+ struct __kernel_rusage __user *wo_rusage;
wait_queue_t child_wait;
int notask_error;
@@ -1514,7 +1514,7 @@ end:
}
SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *,
- infop, int, options, struct rusage __user *, ru)
+ infop, int, options, struct __kernel_rusage __user *, ru)
{
struct wait_opts wo;
struct pid *pid = NULL;
@@ -1582,7 +1582,7 @@ SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *,
}
SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr,
- int, options, struct rusage __user *, ru)
+ int, options, struct __kernel_rusage __user *, ru)
{
struct wait_opts wo;
struct pid *pid = NULL;
diff --git a/kernel/sys.c b/kernel/sys.c
index a4e372b798a5..e578f33a286e 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1529,7 +1529,7 @@ SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim)
*
*/
-static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r)
+static void accumulate_thread_rusage(struct task_struct *t, struct __kernel_rusage *r)
{
r->ru_nvcsw += t->nvcsw;
r->ru_nivcsw += t->nivcsw;
@@ -1539,12 +1539,13 @@ static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r)
r->ru_oublock += task_io_get_oublock(t);
}
-static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
+static void k_getrusage(struct task_struct *p, int who, struct __kernel_rusage *r)
{
struct task_struct *t;
unsigned long flags;
cputime_t tgutime, tgstime, utime, stime;
unsigned long maxrss = 0;
+ struct timeval tv;
memset((char *)r, 0, sizeof (*r));
utime = stime = 0;
@@ -1599,8 +1600,12 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
unlock_task_sighand(p, &flags);
out:
- cputime_to_timeval(utime, &r->ru_utime);
- cputime_to_timeval(stime, &r->ru_stime);
+ cputime_to_timeval(utime, &tv);
+ r->ru_utime.tv_sec = tv.tv_sec;
+ r->ru_utime.tv_usec = tv.tv_usec;
+ cputime_to_timeval(stime, &tv);
+ r->ru_stime.tv_sec = tv.tv_sec;
+ r->ru_stime.tv_usec = tv.tv_usec;
if (who != RUSAGE_CHILDREN) {
struct mm_struct *mm = get_task_mm(p);
@@ -1613,15 +1618,15 @@ out:
r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */
}
-int getrusage(struct task_struct *p, int who, struct rusage __user *ru)
+int getrusage(struct task_struct *p, int who, struct __kernel_rusage __user *ru)
{
- struct rusage r;
+ struct __kernel_rusage r;
k_getrusage(p, who, &r);
return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;
}
-SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru)
+SYSCALL_DEFINE2(getrusage, int, who, struct __kernel_rusage __user *, ru)
{
if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN &&
who != RUSAGE_THREAD)
@@ -1629,10 +1634,10 @@ SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru)
return getrusage(current, who, ru);
}
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_COMPAT_TIME
COMPAT_SYSCALL_DEFINE2(getrusage, int, who, struct compat_rusage __user *, ru)
{
- struct rusage r;
+ struct __kernel_rusage r;
if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN &&
who != RUSAGE_THREAD)
--
2.1.0.rc2
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