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net: filter: let unattached filters use sock_fprog_kern

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The sk_unattached_filter_create() API is used by BPF filters that
are not directly attached or related to sockets, and are used in
team, ptp, xt_bpf, cls_bpf, etc. As such all users do their own
internal managment of obtaining filter blocks and thus already
have them in kernel memory and set up before calling into
sk_unattached_filter_create(). As a result, due to __user annotation
in sock_fprog, sparse triggers false positives (incorrect type in
assignment [different address space]) when filters are set up before
passing them to sk_unattached_filter_create(). Therefore, let
sk_unattached_filter_create() API use sock_fprog_kern to overcome
this issue.

Signed-off-by: Daniel Borkmann <[email protected]>
Acked-by: Alexei Starovoitov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Daniel Borkmann 2014-05-23 18:43:58 +02:00 • committed by David S. Miller
commit b1fcd35cf5
9 changed files with 18 additions and 17 deletions
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4
drivers/isdn/i4l/isdn_ppp.c
View file

@ -634,7 +634,7 @@ isdn_ppp_ioctl(int min, struct file *file, unsigned int cmd, unsigned long arg)
#ifdef CONFIG_IPPP_FILTER
case PPPIOCSPASS:
{
struct sock_fprog fprog;
struct sock_fprog_kern fprog;
struct sock_filter *code;
int err, len = get_filter(argp, &code);
@ -653,7 +653,7 @@ isdn_ppp_ioctl(int min, struct file *file, unsigned int cmd, unsigned long arg)
}
case PPPIOCSACTIVE:
{
struct sock_fprog fprog;
struct sock_fprog_kern fprog;
struct sock_filter *code;
int err, len = get_filter(argp, &code);