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hurd: Fix buffer overrun in __if_nametoindex

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and building with mainline GCC which reports it.

	* sysdeps/mach/hurd/if_index.c (__if_nametoindex): Always end
	ifr.fr_name with a NUL caracter.
This commit is contained in:
Samuel Thibault 2018-04-03 18:06:15 +02:00
parent e88ecbbfe8
commit 511ed56f2e
2 changed files with 8 additions and 1 deletions
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ChangeLog
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@ -1,3 +1,8 @@
2018-04-03 Samuel Thibault <samuel.thibault@ens-lyon.org>
* sysdeps/mach/hurd/if_index.c (__if_nametoindex): Always end
ifr.fr_name with a NUL caracter.
2018-04-03 Wilco Dijkstra <wdijkstr@arm.com>
* sysdeps/ieee754/dbl-64/s_sin.c (__sin): Cleanup ifdefs.

4
sysdeps/mach/hurd/if_index.c
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@ -37,7 +37,9 @@ __if_nametoindex (const char *ifname)
if (fd < 0)
return 0;
strncpy (ifr.ifr_name, ifname, IFNAMSIZ);
strncpy (ifr.ifr_name, ifname, IFNAMSIZ - 1);
ifr.ifr_name[IFNAMESIZ - 1] = '\0';
if (__ioctl (fd, SIOCGIFINDEX, &ifr) < 0)
{
int saved_errno = errno;