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SubjectRe: Linux 2.6.16.21
diff --git a/Makefile b/Makefile
index 600c769..7ae2744 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
VERSION = 2
PATCHLEVEL = 6
SUBLEVEL = 16
-EXTRAVERSION = .20
+EXTRAVERSION = .21
NAME=Sliding Snow Leopard

# *DOCUMENTATION*
diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index d7a4e81..7fb9ff6 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -802,10 +802,13 @@ #ifdef CONFIG_PPC64
if (__get_user(cmcp, &ucp->uc_regs))
return -EFAULT;
mcp = (struct mcontext __user *)(u64)cmcp;
+ /* no need to check access_ok(mcp), since mcp < 4GB */
}
#else
if (__get_user(mcp, &ucp->uc_regs))
return -EFAULT;
+ if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp)))
+ return -EFAULT;
#endif
restore_sigmask(&set);
if (restore_user_regs(regs, mcp, sig))
@@ -907,13 +910,14 @@ int sys_debug_setcontext(struct ucontext
{
struct sig_dbg_op op;
int i;
+ unsigned char tmp;
unsigned long new_msr = regs->msr;
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
unsigned long new_dbcr0 = current->thread.dbcr0;
#endif

for (i=0; i<ndbg; i++) {
- if (__copy_from_user(&op, dbg, sizeof(op)))
+ if (copy_from_user(&op, dbg + i, sizeof(op)))
return -EFAULT;
switch (op.dbg_type) {
case SIG_DBG_SINGLE_STEPPING:
@@ -958,6 +962,11 @@ #if defined(CONFIG_4xx) || defined(CONFI
current->thread.dbcr0 = new_dbcr0;
#endif

+ if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))
+ || __get_user(tmp, (u8 __user *) ctx)
+ || __get_user(tmp, (u8 __user *) (ctx + 1) - 1))
+ return -EFAULT;
+
/*
* If we get a fault copying the context into the kernel's
* image of the user's registers, we can't just return -EFAULT
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 096dfdc..f1715f3 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -183,6 +183,8 @@ #ifdef CONFIG_ALTIVEC
err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
if (err)
return err;
+ if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
+ return -EFAULT;
/* Copy 33 vec registers (vr0..31 and vscr) from the stack */
if (v_regs != 0 && (msr & MSR_VEC) != 0)
err |= __copy_from_user(current->thread.vr, v_regs,
diff --git a/kernel/exit.c b/kernel/exit.c
index 531aadc..fc46c9a 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -828,14 +828,6 @@ fastcall NORET_TYPE void do_exit(long co

tsk->flags |= PF_EXITING;

- /*
- * Make sure we don't try to process any timer firings
- * while we are already exiting.
- */
- tsk->it_virt_expires = cputime_zero;
- tsk->it_prof_expires = cputime_zero;
- tsk->it_sched_expires = 0;
-
if (unlikely(in_atomic()))
printk(KERN_INFO "note: %s[%d] exited with preempt_count %d\n",
current->comm, current->pid,
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 520f6c5..4882bf1 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -1173,6 +1173,9 @@ static void check_process_timers(struct
}
t = tsk;
do {
+ if (unlikely(t->flags & PF_EXITING))
+ continue;
+
ticks = cputime_add(cputime_add(t->utime, t->stime),
prof_left);
if (!cputime_eq(prof_expires, cputime_zero) &&
@@ -1193,11 +1196,7 @@ static void check_process_timers(struct
t->it_sched_expires > sched)) {
t->it_sched_expires = sched;
}
-
- do {
- t = next_thread(t);
- } while (unlikely(t->flags & PF_EXITING));
- } while (t != tsk);
+ } while ((t = next_thread(t)) != tsk);
}
}

@@ -1289,30 +1288,30 @@ #define UNEXPIRED(clock) \

#undef UNEXPIRED

- BUG_ON(tsk->exit_state);
-
/*
* Double-check with locks held.
*/
read_lock(&tasklist_lock);
- spin_lock(&tsk->sighand->siglock);
+ if (likely(tsk->signal != NULL)) {
+ spin_lock(&tsk->sighand->siglock);

- /*
- * Here we take off tsk->cpu_timers[N] and tsk->signal->cpu_timers[N]
- * all the timers that are firing, and put them on the firing list.
- */
- check_thread_timers(tsk, &firing);
- check_process_timers(tsk, &firing);
+ /*
+ * Here we take off tsk->cpu_timers[N] and tsk->signal->cpu_timers[N]
+ * all the timers that are firing, and put them on the firing list.
+ */
+ check_thread_timers(tsk, &firing);
+ check_process_timers(tsk, &firing);

- /*
- * We must release these locks before taking any timer's lock.
- * There is a potential race with timer deletion here, as the
- * siglock now protects our private firing list. We have set
- * the firing flag in each timer, so that a deletion attempt
- * that gets the timer lock before we do will give it up and
- * spin until we've taken care of that timer below.
- */
- spin_unlock(&tsk->sighand->siglock);
+ /*
+ * We must release these locks before taking any timer's lock.
+ * There is a potential race with timer deletion here, as the
+ * siglock now protects our private firing list. We have set
+ * the firing flag in each timer, so that a deletion attempt
+ * that gets the timer lock before we do will give it up and
+ * spin until we've taken care of that timer below.
+ */
+ spin_unlock(&tsk->sighand->siglock);
+ }
read_unlock(&tasklist_lock);

/*
diff --git a/net/netfilter/xt_sctp.c b/net/netfilter/xt_sctp.c
index 10fbfc5..2390182 100644
--- a/net/netfilter/xt_sctp.c
+++ b/net/netfilter/xt_sctp.c
@@ -62,7 +62,7 @@ #endif

do {
sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch);
- if (sch == NULL) {
+ if (sch == NULL || sch->length == 0) {
duprintf("Dropping invalid SCTP packet.\n");
*hotdrop = 1;
return 0;
-
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