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Date: Tue, 01 Jul 2008 08:56:40 +0800 From: Wang Chen <wangchen@...fujitsu.com> To: Ben Hutchings <bhutchings@...arflare.com>, "David S. Miller" <davem@...emloft.net> CC: NETDEV <netdev@...r.kernel.org> Subject: V2 [PATCH] netdevice: Fix wrong string handle in kernel command line parsing Ben Hutchings said the following on 2008-6-30 18:25: >> - strcpy(s[i].name, name); >> + strncpy(s[i].name, name, IFNAMSIZ); > > I think that strncpy() should be strlcpy(), because strncpy() does not > ensure null-termination. > Of course. Thanks, Ben. v1->v2: Use strlcpy() to ensure s[i].name be null-termination. 1. In netdev_boot_setup_add(), a long name will leak. ex. : dev=21,0x1234,0x1234,0x2345,eth123456789verylongname......... 2. In netdev_boot_setup_check(), mismatch will happen if s[i].name is a substring of dev->name. ex. : dev=...eth1 dev=...eth11 Signed-off-by: Wang Chen <wangchen@...fujitsu.com> --- diff --git a/net/core/dev.c b/net/core/dev.c index c421a1f..3360df6 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -454,7 +454,7 @@ static int netdev_boot_setup_add(char *name, struct ifmap *map) for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { memset(s[i].name, 0, sizeof(s[i].name)); - strcpy(s[i].name, name); + strlcpy(s[i].name, name, IFNAMSIZ); memcpy(&s[i].map, map, sizeof(s[i].map)); break; } @@ -479,7 +479,7 @@ int netdev_boot_setup_check(struct net_device *dev) for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && - !strncmp(dev->name, s[i].name, strlen(s[i].name))) { + !strcmp(dev->name, s[i].name)) { dev->irq = s[i].map.irq; dev->base_addr = s[i].map.base_addr; dev->mem_start = s[i].map.mem_start; -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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