>From dd8100caaa5669ee31e20e1c4a5568f3777fbaf5 Mon Sep 17 00:00:00 2001 From: David Stevens Date: Sun, 27 Apr 2008 23:41:51 -0600 Subject: [PATCH 1/2] Several cleanups for the setsockopt compat support. 1) added missing "__user" for kgsr and kgf pointers 2) verify read for only GROUP_FILTER_SIZE(0). The group_filter structure definition (via RFC) includes space for one source in the source list array, but that source need not be present. So, sizeof(group_filter) > GROUP_FILTER_SIZE(0). Fixed the user read-check for minimum length to use the smaller size. 3) remove unneeded "&" for gf_slist addresses Signed-off-by: David L Stevens Signed-off-by: YOSHIFUJI Hideaki --- net/compat.c | 11 +++++++---- 1 files changed, 7 insertions(+), 4 deletions(-) diff --git a/net/compat.c b/net/compat.c index 01bf95d..8146f65 100644 --- a/net/compat.c +++ b/net/compat.c @@ -548,6 +548,9 @@ struct compat_group_filter { __attribute__ ((aligned(4))); } __attribute__ ((packed)); +#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \ + sizeof(struct __kernel_sockaddr_storage)) + int compat_mc_setsockopt(struct sock *sock, int level, int optname, char __user *optval, int optlen, @@ -582,7 +585,7 @@ int compat_mc_setsockopt(struct sock *sock, int level, int optname, case MCAST_UNBLOCK_SOURCE: { struct compat_group_source_req __user *gsr32 = (void *)optval; - struct group_source_req *kgsr = compat_alloc_user_space( + struct group_source_req __user *kgsr = compat_alloc_user_space( sizeof(struct group_source_req)); u32 interface; @@ -603,10 +606,10 @@ int compat_mc_setsockopt(struct sock *sock, int level, int optname, case MCAST_MSFILTER: { struct compat_group_filter __user *gf32 = (void *)optval; - struct group_filter *kgf; + struct group_filter __user *kgf; u32 interface, fmode, numsrc; - if (!access_ok(VERIFY_READ, gf32, sizeof(*gf32)) || + if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) || __get_user(interface, &gf32->gf_interface) || __get_user(fmode, &gf32->gf_fmode) || __get_user(numsrc, &gf32->gf_numsrc)) @@ -622,7 +625,7 @@ int compat_mc_setsockopt(struct sock *sock, int level, int optname, __put_user(numsrc, &kgf->gf_numsrc) || copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)) || - (numsrc && copy_in_user(&kgf->gf_slist, &gf32->gf_slist, + (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist, numsrc * sizeof(kgf->gf_slist[0])))) return -EFAULT; koptval = (char __user *)kgf; -- 1.4.4.4