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updated for version 7.4.009

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Problem:    When a file was not decrypted (yet), writing it may destroy the
            contents.
Solution:   Mark the file as readonly until decryption was done. (Christian
            Brabandt)
This commit is contained in:
Bram Moolenaar
2013-08-25 17:46:08 +02:00
parent 41f1205fef
commit cf81aefd9c
2 changed files with 9 additions and 0 deletions
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7
src/fileio.c
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@@ -2926,9 +2926,14 @@ check_for_cryptkey(cryptkey, ptr, sizep, filesizep, newfile, fname, did_ask)
int *did_ask; /* flag: whether already asked for key */
{
int method = crypt_method_from_magic((char *)ptr, *sizep);
int b_p_ro = curbuf->b_p_ro;
if (method >= 0)
{
/* Mark the buffer as read-only until the decryption has taken place.
* Avoids accidentally overwriting the file with garbage. */
curbuf->b_p_ro = TRUE;
set_crypt_method(curbuf, method);
if (method > 0)
(void)blowfish_self_test();
@@ -2977,6 +2982,8 @@ check_for_cryptkey(cryptkey, ptr, sizep, filesizep, newfile, fname, did_ask)
*sizep -= CRYPT_MAGIC_LEN + salt_len + seed_len;
mch_memmove(ptr, ptr + CRYPT_MAGIC_LEN + salt_len + seed_len,
(size_t)*sizep);
/* Restore the read-only flag. */
curbuf->b_p_ro = b_p_ro;
}
}
/* When starting to edit a new file which does not have encryption, clear