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authorHao Sun <sunhao.th@gmail.com>2022-12-21 22:42:45 +0800
committerAndrew Morton <akpm@linux-foundation.org>2023-01-18 17:12:47 -0800
commit0b7b8704ddcee372099a2bc6781db6ab273a85d5 (patch)
treec1c8de77ddf39a5db49b97611c4b7f019aa81990 /security
parent5a9e34747c9f731bbb6b7fd7521c4fec0d840593 (diff)
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mm: new primitive kvmemdup()
Similar to kmemdup(), but support large amount of bytes with kvmalloc() and does *not* guarantee that the result will be physically contiguous. Use only in cases where kvmalloc() is needed and free it with kvfree(). Also adapt policy_unpack.c in case someone bisect into this. Link: https://lkml.kernel.org/r/20221221144245.27164-1-sunhao.th@gmail.com Signed-off-by: Hao Sun <sunhao.th@gmail.com> Suggested-by: Daniel Borkmann <daniel@iogearbox.net> Cc: Nick Terrell <terrelln@fb.com> Cc: John Johansen <john.johansen@canonical.com> Cc: Paul Moore <paul@paul-moore.com> Cc: James Morris <jmorris@namei.org> Cc: "Serge E. Hallyn" <serge@hallyn.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'security')
-rw-r--r--security/apparmor/policy_unpack.c11
1 files changed, 1 insertions, 10 deletions
diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c
index 66915653108c..5e9949832af6 100644
--- a/security/apparmor/policy_unpack.c
+++ b/security/apparmor/policy_unpack.c
@@ -161,15 +161,6 @@ VISIBLE_IF_KUNIT bool aa_inbounds(struct aa_ext *e, size_t size)
}
EXPORT_SYMBOL_IF_KUNIT(aa_inbounds);
-static void *kvmemdup(const void *src, size_t len)
-{
- void *p = kvmalloc(len, GFP_KERNEL);
-
- if (p)
- memcpy(p, src, len);
- return p;
-}
-
/**
* aa_unpack_u16_chunk - test and do bounds checking for a u16 size based chunk
* @e: serialized data read head (NOT NULL)
@@ -1027,7 +1018,7 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
data->key = key;
data->size = aa_unpack_blob(e, &data->data, NULL);
- data->data = kvmemdup(data->data, data->size);
+ data->data = kvmemdup(data->data, data->size, GFP_KERNEL);
if (data->size && !data->data) {
kfree_sensitive(data->key);
kfree_sensitive(data);