From ddccf7bcee550c5bbdddbaa2abbd34833a7c9585 Mon Sep 17 00:00:00 2001 From: Steven Luong Date: Fri, 18 Jan 2019 22:53:18 -0800 Subject: [PATCH] Fix GCC 8 compiler warnings on strncpy's truncated copy on debian distro MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit For some reason, GCC 8 in debian is pickier than GCC 8 in ubuntu. It complains about things in strncpy like this /home/sluong/vpp/src/vlib/linux/pci.c:485:7: error: ‘strncpy’ output may be truncated copying 15 bytes from a string of length 255 [-Werror=stringop-truncation] strncpy (ifr.ifr_name, e->d_name, sizeof (ifr.ifr_name) - 1); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /home/sluong/vpp/src/vlib/linux/pci.c: At top level: It also complains similar things in string_test.c The fix in pci.c is to convert strncpy to use clib_strncpy The fix in string_test.c is condiational compile the complained code for GCC 8. Change-Id: Ic9341ca54ed7407210502197a28283bc42c26662 Signed-off-by: Steven Luong --- src/plugins/unittest/string_test.c | 12 ++++++++++++ src/vlib/linux/pci.c | 4 ++-- 2 files changed, 14 insertions(+), 2 deletions(-) diff --git a/src/plugins/unittest/string_test.c b/src/plugins/unittest/string_test.c index 41b4c61dff4..cbceb8fb3b2 100644 --- a/src/plugins/unittest/string_test.c +++ b/src/plugins/unittest/string_test.c @@ -750,6 +750,8 @@ test_clib_strncpy (vlib_main_t * vm, unformat_input_t * input) return -1; /* Verify it against strncpy */ +#if __GNUC__ < 8 + /* GCC 8 debian flunks this one at compile time */ strncpy (dst, src, strlen (src)); /* This better not fail but check anyhow */ @@ -758,6 +760,7 @@ test_clib_strncpy (vlib_main_t * vm, unformat_input_t * input) return -1; if (indicator != 0) return -1; +#endif /* limited copy -- strlen src > n, copy up to n */ err = clib_strncpy (dst, "The price of greatness is responsibility.", 10); @@ -791,12 +794,15 @@ test_clib_strncpy (vlib_main_t * vm, unformat_input_t * input) if (indicator != 0) return -1; /* Verify it against strncpy */ +#if __GNUC__ < 8 + /* GCC 8 debian flunks this one at compile time */ strncpy (dst, src, strlen (src)); if (strcmp_s (dst, clib_strnlen (dst, sizeof (dst)), src, &indicator) != EOK) return -1; if (indicator != 0) return -1; +#endif /* zero length copy */ clib_strncpy (old_dst, dst, clib_strnlen (dst, sizeof (dst))); @@ -1046,6 +1052,8 @@ test_strncat_s (vlib_main_t * vm, unformat_input_t * input) if (indicator != 0) return -1; /* verify it against strncat */ +#if __GNUC__ < 8 + /* GCC 8 debian flunks this one at compile time */ strcpy_s (dst, sizeof (dst), s1); strncat (dst, s2, 13); if (strcmp_s (dst, s1size - 1, "Two things are infinite: the universe ", @@ -1053,6 +1061,7 @@ test_strncat_s (vlib_main_t * vm, unformat_input_t * input) return -1; if (indicator != 0) return -1; +#endif /* negative stuff */ err = strncat_s (0, 0, 0, 1); @@ -1169,6 +1178,8 @@ test_clib_strncat (vlib_main_t * vm, unformat_input_t * input) if (indicator != 0) return -1; /* verify it against strncat */ +#if __GNUC__ < 8 + /* GCC 8 debian flunks this one at compile time */ strcpy_s (dst, sizeof (dst), s1); strncat (dst, s2, 13); if (strcmp_s (dst, s1size - 1, "Two things are infinite: the universe ", @@ -1176,6 +1187,7 @@ test_clib_strncat (vlib_main_t * vm, unformat_input_t * input) return -1; if (indicator != 0) return -1; +#endif /* negative stuff */ err = clib_strncat (0, 0, 1); diff --git a/src/vlib/linux/pci.c b/src/vlib/linux/pci.c index ee3eebfbd83..d31b3c94d62 100644 --- a/src/vlib/linux/pci.c +++ b/src/vlib/linux/pci.c @@ -466,7 +466,7 @@ vlib_pci_bind_to_uio (vlib_main_t * vm, vlib_pci_addr_t * addr, clib_memset (&ifr, 0, sizeof ifr); clib_memset (&drvinfo, 0, sizeof drvinfo); ifr.ifr_data = (char *) &drvinfo; - strncpy (ifr.ifr_name, e->d_name, sizeof (ifr.ifr_name) - 1); + clib_strncpy (ifr.ifr_name, e->d_name, sizeof (ifr.ifr_name) - 1); drvinfo.cmd = ETHTOOL_GDRVINFO; if (ioctl (fd, SIOCETHTOOL, &ifr) < 0) @@ -482,7 +482,7 @@ vlib_pci_bind_to_uio (vlib_main_t * vm, vlib_pci_addr_t * addr, continue; clib_memset (&ifr, 0, sizeof (ifr)); - strncpy (ifr.ifr_name, e->d_name, sizeof (ifr.ifr_name) - 1); + clib_strncpy (ifr.ifr_name, e->d_name, sizeof (ifr.ifr_name) - 1); if (ioctl (fd, SIOCGIFFLAGS, &ifr) < 0) { -- 2.16.6