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| author | Kees Cook <keescook@chromium.org> | 2022-09-26 19:29:23 -0700 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2022-10-07 15:19:06 +0200 |
| commit | 10d5ea5a436da8d60cdb5845f454d595accdbce0 (patch) | |
| tree | 47a19f25cfd590de7b562b4956d14373e4dde429 /net | |
| parent | e3e6e1d16a4cf7b63159ec71774e822194071954 (diff) | |
| download | lwn-10d5ea5a436da8d60cdb5845f454d595accdbce0.tar.gz lwn-10d5ea5a436da8d60cdb5845f454d595accdbce0.zip | |
wifi: nl80211: Split memcpy() of struct nl80211_wowlan_tcp_data_token flexible array
To work around a misbehavior of the compiler's ability to see into
composite flexible array structs (as detailed in the coming memcpy()
hardening series[1]), split the memcpy() of the header and the payload
so no false positive run-time overflow warning will be generated.
[1] https://lore.kernel.org/linux-hardening/20220901065914.1417829-2-keescook@chromium.org/
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/wireless/nl80211.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 8ff8b1c040f0..597c52236514 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -13265,7 +13265,9 @@ static int nl80211_parse_wowlan_tcp(struct cfg80211_registered_device *rdev, wake_mask_size); if (tok) { cfg->tokens_size = tokens_size; - memcpy(&cfg->payload_tok, tok, sizeof(*tok) + tokens_size); + cfg->payload_tok = *tok; + memcpy(cfg->payload_tok.token_stream, tok->token_stream, + tokens_size); } trig->tcp = cfg; |