[PATCH] more fixes for Opteron ia32 siginfo interface
From: Joe Korty
Date: Tue Jan 06 2004 - 11:31:53 EST
Andi and Andrew,
This patch should fix all the remaining Opteron ia32 siginfo_t issues
in 2.6.0. It has been only lightly tested: posix timer tests, a small
sigqueue(2) test that I wrote, and part of ltp, all compiled in ia32
mode.
Patch is against 2.6.0 as 2.6.1-rc1 does not compile under Opteron.
ChangeLog:
o Base is 2.6.0 with Andi Kleen's x86_64-2.6.0-1.bz2 patch.
o import Andrew Morton's 2.6.1-rc1 ia32_copy_siginfo_to_user changes.
o add final missing bits to ia32_copy_siginfo_to_user.
o insert missing timer union into siginfo_t32.
o remove siginfo64to32, use ia32_copy_siginfo_to_user instead.
o rewrite siginfo32to64 as ia32_copy_siginfo_from_user, simplify.
o fix possible data leak in sys32_rt_sigtimedwait.
Pick and choose whatever you like from this.
Regards,
Joe
arch/x86_64/ia32/ia32_signal.c | 49 ++++++++++++++-------
arch/x86_64/ia32/sys_ia32.c | 95 +++--------------------------------------
include/asm-x86_64/ia32.h | 10 +++-
3 files changed, 51 insertions(+), 103 deletions(-)
diff -ura base/arch/x86_64/ia32/ia32_signal.c new/arch/x86_64/ia32/ia32_signal.c
--- base/arch/x86_64/ia32/ia32_signal.c 2004-01-06 11:00:24.942006638 -0500
+++ new/arch/x86_64/ia32/ia32_signal.c 2004-01-06 11:00:51.486440081 -0500
@@ -44,10 +44,10 @@
asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
void signal_fault(struct pt_regs *regs, void *frame, char *where);
-static int ia32_copy_siginfo_to_user(siginfo_t32 *to, siginfo_t *from)
+int ia32_copy_siginfo_to_user(siginfo_t32 __user *to, siginfo_t *from)
{
int err;
- if (!access_ok (VERIFY_WRITE, to, sizeof(siginfo_t)))
+ if (!access_ok (VERIFY_WRITE, to, sizeof(siginfo_t32)))
return -EFAULT;
/* If you change siginfo_t structure, please make sure that
@@ -55,20 +55,18 @@
It should never copy any pad contained in the structure
to avoid security leaks, but must copy the generic
3 ints plus the relevant union member. */
-
+
+ err = __put_user(from->si_signo, &to->si_signo);
+ err |= __put_user(from->si_errno, &to->si_errno);
+ err |= __put_user(from->si_code, &to->si_code);
+
if (from->si_code < 0) {
- err = __put_user(from->si_signo, &to->si_signo);
- err |= __put_user(from->si_errno, &to->si_errno);
- err |= __put_user(from->si_code, &to->si_code);
- err |= __put_user(from->_sifields._rt._pid, &to->_sifields._rt._pid);
- err |= __put_user(from->_sifields._rt._uid, &to->_sifields._rt._uid);
- err |= __put_user((u32)(u64)from->_sifields._rt._sigval.sival_ptr,
- &to->_sifields._rt._sigval.sival_ptr);
+ err |= __put_user(from->si_pid, &to->si_pid);
+ err |= __put_user(from->si_uid, &to->si_uid);
+ err |= __put_user((u32)(u64)from->si_ptr, &to->si_ptr);
} else {
- err = __put_user(from->si_signo, &to->si_signo);
- err |= __put_user(from->si_errno, &to->si_errno);
- err |= __put_user(from->si_code, &to->si_code);
- /* First 32bits of unions are always present. */
+ /* First 32bits of unions are always present:
+ * si_pid === si_band === si_tid === si_addr(LS half) */
err |= __put_user(from->si_pid, &to->si_pid);
switch (from->si_code >> 16) {
case __SI_FAULT >> 16:
@@ -78,18 +76,39 @@
err |= __put_user(from->si_stime, &to->si_stime);
err |= __put_user(from->si_status, &to->si_status);
default:
+ case __SI_KILL >> 16:
err |= __put_user(from->si_uid, &to->si_uid);
break;
case __SI_POLL >> 16:
- err |= __put_user(from->si_band, &to->si_band);
err |= __put_user(from->si_fd, &to->si_fd);
break;
+ case __SI_TIMER >> 16:
+ err |= __put_user(from->si_overrun, &to->si_overrun);
+ err |= __put_user((u32)(u64)from->si_ptr, &to->si_ptr);
+ break;
/* case __SI_RT: This is not generated by the kernel as of now. */
}
}
return err;
}
+int ia32_copy_siginfo_from_user(siginfo_t *to, siginfo_t32 __user *from)
+{
+ int err;
+ if (!access_ok (VERIFY_READ, from, sizeof(siginfo_t32)))
+ return -EFAULT;
+
+ err = __get_user(to->si_signo, &from->si_signo);
+ err |= __get_user(to->si_errno, &from->si_errno);
+ err |= __get_user(to->si_code, &from->si_code);
+
+ err |= __get_user(to->si_pid, &from->si_pid);
+ err |= __get_user(to->si_uid, &from->si_uid);
+ err |= __get_user((u32)(u64)to->si_ptr, &from->si_ptr);
+
+ return err;
+}
+
asmlinkage long
sys32_sigsuspend(int history0, int history1, old_sigset_t mask, struct pt_regs regs)
{
diff -ura base/arch/x86_64/ia32/sys_ia32.c new/arch/x86_64/ia32/sys_ia32.c
--- base/arch/x86_64/ia32/sys_ia32.c 2004-01-06 11:00:24.949004907 -0500
+++ new/arch/x86_64/ia32/sys_ia32.c 2004-01-06 11:00:51.488439586 -0500
@@ -1022,84 +1022,6 @@
return ret;
}
-siginfo_t32 *
-siginfo64to32(siginfo_t32 *d, siginfo_t *s)
-{
- memset (d, 0, sizeof(siginfo_t32));
- d->si_signo = s->si_signo;
- d->si_errno = s->si_errno;
- d->si_code = s->si_code;
- if (s->si_signo >= SIGRTMIN) {
- d->si_pid = s->si_pid;
- d->si_uid = s->si_uid;
- memcpy(&d->si_int, &s->si_int,
- sizeof(siginfo_t) - offsetof(siginfo_t,si_int));
- } else switch (s->si_signo) {
- /* XXX: What about POSIX1.b timers */
- case SIGCHLD:
- d->si_pid = s->si_pid;
- d->si_status = s->si_status;
- d->si_utime = s->si_utime;
- d->si_stime = s->si_stime;
- break;
- case SIGSEGV:
- case SIGBUS:
- case SIGFPE:
- case SIGILL:
- d->si_addr = (long)(s->si_addr);
-// d->si_trapno = s->si_trapno;
- break;
- case SIGPOLL:
- d->si_band = s->si_band;
- d->si_fd = s->si_fd;
- break;
- default:
- d->si_pid = s->si_pid;
- d->si_uid = s->si_uid;
- break;
- }
- return d;
-}
-
-siginfo_t *
-siginfo32to64(siginfo_t *d, siginfo_t32 *s)
-{
- d->si_signo = s->si_signo;
- d->si_errno = s->si_errno;
- d->si_code = s->si_code;
- if (s->si_signo >= SIGRTMIN) {
- d->si_pid = s->si_pid;
- d->si_uid = s->si_uid;
- memcpy(&d->si_int,
- &s->si_int,
- sizeof(siginfo_t) - offsetof(siginfo_t, si_int));
- } else switch (s->si_signo) {
- /* XXX: What about POSIX1.b timers */
- case SIGCHLD:
- d->si_pid = s->si_pid;
- d->si_status = s->si_status;
- d->si_utime = s->si_utime;
- d->si_stime = s->si_stime;
- break;
- case SIGSEGV:
- case SIGBUS:
- case SIGFPE:
- case SIGILL:
- d->si_addr = (void *)A(s->si_addr);
-// d->si_trapno = s->si_trapno;
- break;
- case SIGPOLL:
- d->si_band = s->si_band;
- d->si_fd = s->si_fd;
- break;
- default:
- d->si_pid = s->si_pid;
- d->si_uid = s->si_uid;
- break;
- }
- return d;
-}
-
extern asmlinkage long
sys_rt_sigtimedwait(const sigset_t *uthese, siginfo_t *uinfo,
const struct timespec *uts, size_t sigsetsize);
@@ -1114,7 +1036,6 @@
int ret;
mm_segment_t old_fs = get_fs();
siginfo_t info;
- siginfo_t32 info32;
if (copy_from_user (&s32, uthese, sizeof(compat_sigset_t)))
return -EFAULT;
@@ -1126,13 +1047,18 @@
}
if (uts && get_compat_timespec(&t, uts))
return -EFAULT;
+ if (uinfo) {
+ /* stop data leak to user space in case of structure fill mismatch
+ * between sys_rt_sigtimedwait & ia32_copy_siginfo_to_user.
+ */
+ memset(&info, 0, sizeof(info));
+ }
set_fs (KERNEL_DS);
ret = sys_rt_sigtimedwait(&s, uinfo ? &info : NULL, uts ? &t : NULL,
sigsetsize);
set_fs (old_fs);
if (ret >= 0 && uinfo) {
- if (copy_to_user (uinfo, siginfo64to32(&info32, &info),
- sizeof(siginfo_t32)))
+ if (ia32_copy_siginfo_to_user(uinfo, &info))
return -EFAULT;
}
return ret;
@@ -1145,14 +1071,11 @@
sys32_rt_sigqueueinfo(int pid, int sig, siginfo_t32 *uinfo)
{
siginfo_t info;
- siginfo_t32 info32;
int ret;
mm_segment_t old_fs = get_fs();
-
- if (copy_from_user (&info32, uinfo, sizeof(siginfo_t32)))
+
+ if (ia32_copy_siginfo_from_user(&info, uinfo))
return -EFAULT;
- /* XXX: Is this correct? */
- siginfo32to64(&info, &info32);
set_fs (KERNEL_DS);
ret = sys_rt_sigqueueinfo(pid, sig, &info);
set_fs (old_fs);
diff -ura base/include/asm-x86_64/ia32.h new/include/asm-x86_64/ia32.h
--- base/include/asm-x86_64/ia32.h 2003-12-17 21:59:35.000000000 -0500
+++ new/include/asm-x86_64/ia32.h 2004-01-06 11:00:51.486440081 -0500
@@ -100,8 +100,11 @@
/* POSIX.1b timers */
struct {
- unsigned int _timer1;
- unsigned int _timer2;
+ int _tid; /* timer id */
+ int _overrun; /* overrun count */
+ sigval_t32 _sigval; /* same as below */
+ int _sys_private; /* not to be passed to user */
+ int _overrun_incr; /* amount to add to overrun */
} _timer;
/* POSIX.1b signals */
@@ -164,9 +167,12 @@
#ifdef __KERNEL__
struct user_desc;
+struct siginfo_t;
int do_get_thread_area(struct thread_struct *t, struct user_desc *u_info);
int do_set_thread_area(struct thread_struct *t, struct user_desc *u_info);
int ia32_child_tls(struct task_struct *p, struct pt_regs *childregs);
+int ia32_copy_siginfo_from_user(siginfo_t *to, siginfo_t32 __user *from);
+int ia32_copy_siginfo_to_user(siginfo_t32 __user *to, siginfo_t *from);
#endif
#endif /* !CONFIG_IA32_SUPPORT */
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/