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| author | Masahiro Yamada <masahiroy@kernel.org> | 2022-06-06 13:53:55 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-14 16:53:58 +0200 |
| commit | 64aef8efe96c1616142c4476a05731306fc4494e (patch) | |
| tree | 66f1f26f7408d98eb9fd73cf50a528bf5f6e3abe | |
| parent | e53cd3814504b2cadaba4d5a8a07eeea9ddacd03 (diff) | |
| download | linux-64aef8efe96c1616142c4476a05731306fc4494e.tar.gz linux-64aef8efe96c1616142c4476a05731306fc4494e.tar.bz2 linux-64aef8efe96c1616142c4476a05731306fc4494e.zip | |
net: ipv6: unexport __init-annotated seg6_hmac_init()
[ Upstream commit 5801f064e35181c71857a80ff18af4dbec3c5f5c ]
EXPORT_SYMBOL and __init is a bad combination because the .init.text
section is freed up after the initialization. Hence, modules cannot
use symbols annotated __init. The access to a freed symbol may end up
with kernel panic.
modpost used to detect it, but it has been broken for a decade.
Recently, I fixed modpost so it started to warn it again, then this
showed up in linux-next builds.
There are two ways to fix it:
- Remove __init
- Remove EXPORT_SYMBOL
I chose the latter for this case because the caller (net/ipv6/seg6.c)
and the callee (net/ipv6/seg6_hmac.c) belong to the same module.
It seems an internal function call in ipv6.ko.
Fixes: bf355b8d2c30 ("ipv6: sr: add core files for SR HMAC support")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | net/ipv6/seg6_hmac.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/net/ipv6/seg6_hmac.c b/net/ipv6/seg6_hmac.c index 558fe8cc6d43..ad5f8d521402 100644 --- a/net/ipv6/seg6_hmac.c +++ b/net/ipv6/seg6_hmac.c @@ -405,7 +405,6 @@ int __init seg6_hmac_init(void) { return seg6_hmac_init_algo(); } -EXPORT_SYMBOL(seg6_hmac_init); int __net_init seg6_hmac_net_init(struct net *net) { |