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io_pgetevents: use __kernel_timespec

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struct timespec is not y2038 safe.
struct __kernel_timespec is the new y2038 safe structure for all
syscalls that are using struct timespec.
Update io_pgetevents interfaces to use struct __kernel_timespec.

sigset_t also has different representations on 32 bit and 64 bit
architectures. Hence, we need to support the following different
syscalls:

New y2038 safe syscalls:
(Controlled by CONFIG_64BIT_TIME for 32 bit ABIs)

Native 64 bit(unchanged) and native 32 bit : sys_io_pgetevents
Compat : compat_sys_io_pgetevents_time64

Older y2038 unsafe syscalls:
(Controlled by CONFIG_32BIT_COMPAT_TIME for 32 bit ABIs)

Native 32 bit : sys_io_pgetevents_time32
Compat : compat_sys_io_pgetevents

Note that io_getevents syscalls do not have a y2038 safe solution.

Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Deepa Dinamani 2018-09-19 21:41:08 -07:00 committed by Arnd Bergmann
parent e024707bcc
commit 7a35397f8c
3 changed files with 95 additions and 5 deletions
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84
fs/aio.c
View File

@ -2062,11 +2062,13 @@ static long do_io_getevents(aio_context_t ctx_id,
* specifies an infinite timeout. Note that the timeout pointed to by
* timeout is relative. Will fail with -ENOSYS if not implemented.
*/
#if !defined(CONFIG_64BIT_TIME) || defined(CONFIG_64BIT)
SYSCALL_DEFINE5(io_getevents, aio_context_t, ctx_id,
long, min_nr,
long, nr,
struct io_event __user *, events,
struct timespec __user *, timeout)
struct __kernel_timespec __user *, timeout)
{
struct timespec64 ts;
int ret;
@ -2080,6 +2082,8 @@ SYSCALL_DEFINE5(io_getevents, aio_context_t, ctx_id,
return ret;
}
#endif
struct __aio_sigset {
const sigset_t __user *sigmask;
size_t sigsetsize;
@ -2090,7 +2094,7 @@ SYSCALL_DEFINE6(io_pgetevents,
long, min_nr,
long, nr,
struct io_event __user *, events,
struct timespec __user *, timeout,
struct __kernel_timespec __user *, timeout,
const struct __aio_sigset __user *, usig)
{
struct __aio_sigset ksig = { NULL, };
@ -2104,6 +2108,39 @@ SYSCALL_DEFINE6(io_pgetevents,
if (usig && copy_from_user(&ksig, usig, sizeof(ksig)))
return -EFAULT;
ret = set_user_sigmask(ksig.sigmask, &ksigmask, &sigsaved, ksig.sigsetsize);
if (ret)
return ret;
ret = do_io_getevents(ctx_id, min_nr, nr, events, timeout ? &ts : NULL);
restore_user_sigmask(ksig.sigmask, &sigsaved);
if (signal_pending(current) && !ret)
ret = -ERESTARTNOHAND;
return ret;
}
#if defined(CONFIG_COMPAT_32BIT_TIME) && !defined(CONFIG_64BIT)
SYSCALL_DEFINE6(io_pgetevents_time32,
aio_context_t, ctx_id,
long, min_nr,
long, nr,
struct io_event __user *, events,
struct old_timespec32 __user *, timeout,
const struct __aio_sigset __user *, usig)
{
struct __aio_sigset ksig = { NULL, };
sigset_t ksigmask, sigsaved;
struct timespec64 ts;
int ret;
if (timeout && unlikely(get_old_timespec32(&ts, timeout)))
return -EFAULT;
if (usig && copy_from_user(&ksig, usig, sizeof(ksig)))
return -EFAULT;
ret = set_user_sigmask(ksig.sigmask, &ksigmask, &sigsaved, ksig.sigsetsize);
if (ret)
@ -2117,7 +2154,10 @@ SYSCALL_DEFINE6(io_pgetevents,
return ret;
}
#ifdef CONFIG_COMPAT
#endif
#if defined(CONFIG_COMPAT_32BIT_TIME)
COMPAT_SYSCALL_DEFINE5(io_getevents, compat_aio_context_t, ctx_id,
compat_long_t, min_nr,
compat_long_t, nr,
@ -2136,12 +2176,17 @@ COMPAT_SYSCALL_DEFINE5(io_getevents, compat_aio_context_t, ctx_id,
return ret;
}
#endif
#ifdef CONFIG_COMPAT
struct __compat_aio_sigset {
compat_sigset_t __user *sigmask;
compat_size_t sigsetsize;
};
#if defined(CONFIG_COMPAT_32BIT_TIME)
COMPAT_SYSCALL_DEFINE6(io_pgetevents,
compat_aio_context_t, ctx_id,
compat_long_t, min_nr,
@ -2172,4 +2217,37 @@ COMPAT_SYSCALL_DEFINE6(io_pgetevents,
return ret;
}
#endif
COMPAT_SYSCALL_DEFINE6(io_pgetevents_time64,
compat_aio_context_t, ctx_id,
compat_long_t, min_nr,
compat_long_t, nr,
struct io_event __user *, events,
struct __kernel_timespec __user *, timeout,
const struct __compat_aio_sigset __user *, usig)
{
struct __compat_aio_sigset ksig = { NULL, };
sigset_t ksigmask, sigsaved;
struct timespec64 t;
int ret;
if (timeout && get_timespec64(&t, timeout))
return -EFAULT;
if (usig && copy_from_user(&ksig, usig, sizeof(ksig)))
return -EFAULT;
ret = set_compat_user_sigmask(ksig.sigmask, &ksigmask, &sigsaved, ksig.sigsetsize);
if (ret)
return ret;
ret = do_io_getevents(ctx_id, min_nr, nr, events, timeout ? &t : NULL);
restore_user_sigmask(ksig.sigmask, &sigsaved);
if (signal_pending(current) && !ret)
ret = -ERESTARTNOHAND;
return ret;
}
#endif

6
include/linux/compat.h
View File

@ -562,6 +562,12 @@ asmlinkage long compat_sys_io_pgetevents(compat_aio_context_t ctx_id,
struct io_event __user *events,
struct old_timespec32 __user *timeout,
const struct __compat_aio_sigset __user *usig);
asmlinkage long compat_sys_io_pgetevents_time64(compat_aio_context_t ctx_id,
compat_long_t min_nr,
compat_long_t nr,
struct io_event __user *events,
struct __kernel_timespec __user *timeout,
const struct __compat_aio_sigset __user *usig);
/* fs/cookies.c */
asmlinkage long compat_sys_lookup_dcookie(u32, u32, char __user *, compat_size_t);

10
include/linux/syscalls.h
View File

@ -296,12 +296,18 @@ asmlinkage long sys_io_getevents(aio_context_t ctx_id,
long min_nr,
long nr,
struct io_event __user *events,
struct timespec __user *timeout);
struct __kernel_timespec __user *timeout);
asmlinkage long sys_io_pgetevents(aio_context_t ctx_id,
long min_nr,
long nr,
struct io_event __user *events,
struct timespec __user *timeout,
struct __kernel_timespec __user *timeout,
const struct __aio_sigset *sig);
asmlinkage long sys_io_pgetevents_time32(aio_context_t ctx_id,
long min_nr,
long nr,
struct io_event __user *events,
struct old_timespec32 __user *timeout,
const struct __aio_sigset *sig);
/* fs/xattr.c */