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ext4: report correct st_size for encrypted symlinks

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commit 8c4bca10ceafc43b1ca0a9fab5fa27e13cbce99e upstream.

The stat() family of syscalls report the wrong size for encrypted
symlinks, which has caused breakage in several userspace programs.

Fix this by calling fscrypt_symlink_getattr() after ext4_getattr() for
encrypted symlinks.  This function computes the correct size by reading
and decrypting the symlink target (if it's not already cached).

For more details, see the commit which added fscrypt_symlink_getattr().

Fixes: f348c25232 ("ext4 crypto: add symlink encryption")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210702065350.209646-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Biggers 2021-09-01 09:27:19 -07:00 committed by AuxXxilium
parent 9d96d87d5e
commit f99cbf2880
1 changed files with 10 additions and 1 deletions
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11
fs/ext4/symlink.c
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@ -55,6 +55,15 @@ static const char *ext4_encrypted_get_link(struct dentry *dentry,
return paddr; return paddr;
} }
static int ext4_encrypted_symlink_getattr(const struct path *path,
struct kstat *stat, u32 request_mask,
unsigned int query_flags)
{
ext4_getattr(path, stat, request_mask, query_flags);
return fscrypt_symlink_getattr(path, stat);
}
const struct inode_operations ext4_encrypted_symlink_inode_operations = { const struct inode_operations ext4_encrypted_symlink_inode_operations = {
#ifdef MY_ABC_HERE #ifdef MY_ABC_HERE
.syno_getattr = ext4_syno_getattr, .syno_getattr = ext4_syno_getattr,
@ -68,7 +77,7 @@ const struct inode_operations ext4_encrypted_symlink_inode_operations = {
#endif /* MY_ABC_HERE */ #endif /* MY_ABC_HERE */
.get_link = ext4_encrypted_get_link, .get_link = ext4_encrypted_get_link,
.setattr = ext4_setattr, .setattr = ext4_setattr,
.getattr = ext4_getattr, .getattr = ext4_encrypted_symlink_getattr,
.listxattr = ext4_listxattr, .listxattr = ext4_listxattr,
#ifdef MY_ABC_HERE #ifdef MY_ABC_HERE
.syno_get_crtime = ext4_syno_get_crtime, .syno_get_crtime = ext4_syno_get_crtime,