On Wed, Jun 03, 2020 at 08:33:15PM -0700, Nathan Chancellor wrote:

On Wed, Jun 03, 2020 at 04:32:02PM -0700, Kees Cook wrote:

quoted

Using uninitialized_var() is dangerous as it papers over real bugs[1]
(or can in the future), and suppresses unrelated compiler warnings
(e.g. "unused variable"). If the compiler thinks it is uninitialized,
either simply initialize the variable or make compiler changes.

I preparation for removing[2] the[3] macro[4], remove all remaining
needless uses with the following script:

git grep '\buninitialized_var\b' | cut -d: -f1 | sort -u | \
	xargs perl -pi -e \
		's/\buninitialized_var\(([^\)]+)\)/\1/g;
		 s:\s*/\* (GCC be quiet|to make compiler happy) \*/$::g;'

drivers/video/fbdev/riva/riva_hw.c was manually tweaked to avoid
pathological white-space.

No outstanding warnings were found building allmodconfig with GCC 9.3.0
for x86_64, i386, arm64, arm, powerpc, powerpc64le, s390x, mips, sparc64,
alpha, and m68k.

[1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/ (local)
[2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/ (local)
[3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/ (local)
[4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/ (local)

Signed-off-by: Kees Cook <redacted>

<snip>

quoted

diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index a0f6813f4560..a71fa7204882 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c

@@ -1829,7 +1829,7 @@ static int kvmppc_vcpu_run_pr(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
 {
 	int ret;
 #ifdef CONFIG_ALTIVEC
-	unsigned long uninitialized_var(vrsave);
+	unsigned long vrsave;
 #endif

This variable is actually unused:

../arch/powerpc/kvm/book3s_pr.c:1832:16: warning: unused variable 'vrsave' [-Wunused-variable]
        unsigned long vrsave;
                      ^
1 warning generated.

It has been unused since commit 99dae3bad28d ("KVM: PPC: Load/save
FP/VMX/VSX state directly to/from vcpu struct").

$ git grep vrsave 99dae3bad28d8fdd32b7bfdd5e2ec7bb2d4d019d arch/powerpc/kvm/book3s_pr.c
99dae3bad28d8fdd32b7bfdd5e2ec7bb2d4d019d:arch/powerpc/kvm/book3s_pr.c:  unsigned long uninitialized_var(vrsave);

I would nuke the whole '#ifdef' block.

Ah, thanks! I wonder why I don't have CONFIG_ALTIVEC in any of my ppc
builds. Hmmm.

-Kees

-- 
Kees Cook