linux-kernel - [PATCH] powerpc/64: Fix build failure with GCC 8.1

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Message-Id: <1d3fd6a6c35e41d3e25ebe5256adf021369ada7c.1527525305.git.christophe.leroy@c-s.fr>
Date:   Mon, 28 May 2018 16:37:22 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] powerpc/64: Fix build failure with GCC 8.1

  CC      arch/powerpc/kernel/nvram_64.o
arch/powerpc/kernel/nvram_64.c: In function 'nvram_create_partition':
arch/powerpc/kernel/nvram_64.c:1042:2: error: 'strncpy' specified bound 12 equals destination size [-Werror=stringop-truncation]
  strncpy(new_part->header.name, name, 12);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  CC      arch/powerpc/kernel/trace/ftrace.o
In function 'make_field',
    inlined from 'ps3_repository_read_boot_dat_address' at arch/powerpc/platforms/ps3/repository.c:900:9:
arch/powerpc/platforms/ps3/repository.c:106:2: error: 'strncpy' output truncated before terminating nul copying 8 bytes from a string of the same length [-Werror=stringop-truncation]
  strncpy((char *)&n, text, 8);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/kernel/nvram_64.c          | 2 +-
 arch/powerpc/platforms/ps3/repository.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
index ba681dac7b46..7507448cd904 100644
--- a/arch/powerpc/kernel/nvram_64.c
+++ b/arch/powerpc/kernel/nvram_64.c
@@ -1039,7 +1039,7 @@ loff_t __init nvram_create_partition(const char *name, int sig,
 	new_part->index = free_part->index;
 	new_part->header.signature = sig;
 	new_part->header.length = size;
-	strncpy(new_part->header.name, name, 12);
+	strncpy(new_part->header.name, name, sizeof(new_part->header.name) - 1);
 	new_part->header.checksum = nvram_checksum(&new_part->header);
 
 	rc = nvram_write_header(new_part);
diff --git a/arch/powerpc/platforms/ps3/repository.c b/arch/powerpc/platforms/ps3/repository.c
index 50dbaf24b1ee..b4d6628eec5e 100644
--- a/arch/powerpc/platforms/ps3/repository.c
+++ b/arch/powerpc/platforms/ps3/repository.c
@@ -101,9 +101,9 @@ static u64 make_first_field(const char *text, u64 index)
 
 static u64 make_field(const char *text, u64 index)
 {
-	u64 n;
+	u64 n = 0;
 
-	strncpy((char *)&n, text, 8);
+	memcpy((char *)&n, text, min(sizeof(n), strlen(text)));
 	return n + index;
 }
 
-- 
2.13.3