76 lines
2.3 KiB
Diff
76 lines
2.3 KiB
Diff
From dbf230e4cf823dd6b6a3bad6d29dfad4f0ffa8fc Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Bj=C3=B6rn=20Esser?= <besser82@fedoraproject.org>
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Date: Mon, 14 Jun 2021 23:28:28 +0200
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Subject: [PATCH] libmisc/salt.c: Add comments how the minmum buffer length is
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computed.
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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In the previous commit we refactored the functions converting the
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rounds number into a string for use with the crypt() function, to
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not require any static buffer anymore.
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Add some clarifying comments about how the minimum required buffer
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length is computed inside of these functions.
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Signed-off-by: Björn Esser <besser82@fedoraproject.org>
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---
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libmisc/salt.c | 29 +++++++++++++++++++++++++----
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1 file changed, 25 insertions(+), 4 deletions(-)
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diff --git a/libmisc/salt.c b/libmisc/salt.c
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index 98982ed1..e17093fc 100644
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--- a/libmisc/salt.c
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+++ b/libmisc/salt.c
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@@ -216,7 +216,14 @@ static /*@observer@*/void SHA_salt_rounds_to_buf (char *buf, /*@null@*/int *pref
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return;
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}
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- /* Check if the result buffer is long enough. */
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+ /*
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+ * Check if the result buffer is long enough.
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+ * We are going to write a maximum of 17 bytes,
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+ * plus one byte for the terminator.
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+ * rounds=XXXXXXXXX$
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+ * 00000000011111111
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+ * 12345678901234567
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+ */
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assert (GENSALT_SETTING_SIZE > buf_begin + 17);
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(void) snprintf (buf + buf_begin, 18, "rounds=%lu$", rounds);
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@@ -274,7 +281,14 @@ static /*@observer@*/void BCRYPT_salt_rounds_to_buf (char *buf, /*@null@*/int *p
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rounds = 19;
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}
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- /* Check if the result buffer is long enough. */
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+ /*
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+ * Check if the result buffer is long enough.
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+ * We are going to write three bytes,
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+ * plus one byte for the terminator.
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+ * XX$
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+ * 000
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+ * 123
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+ */
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assert (GENSALT_SETTING_SIZE > buf_begin + 3);
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(void) snprintf (buf + buf_begin, 4, "%2.2lu$", rounds);
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@@ -308,8 +322,15 @@ static /*@observer@*/void YESCRYPT_salt_cost_to_buf (char *buf, /*@null@*/int *p
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cost = Y_COST_MAX;
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}
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- /* Check if the result buffer is long enough. */
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- assert (GENSALT_SETTING_SIZE > buf_begin + 3);
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+ /*
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+ * Check if the result buffer is long enough.
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+ * We are going to write four bytes,
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+ * plus one byte for the terminator.
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+ * jXX$
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+ * 0000
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+ * 1234
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+ */
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+ assert (GENSALT_SETTING_SIZE > buf_begin + 4);
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buf[buf_begin + 0] = 'j';
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if (cost < 3) {
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