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glib2/backport-CVE-2025-3360.patch

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fix CVE-2025-3360, CVE-2025-4373
2025-05-11 00:33:13 +08:00
From 37ae3d76695e2afe9646bc6a971110b50d080f73 Mon Sep 17 00:00:00 2001
From: Philip Withnall <pwithnall@gnome.org>
Date: Tue, 18 Feb 2025 16:44:58 +0000
Subject: gdatetime: Fix integer overflow when parsing very long ISO8601 inputs
This will only happen with invalid (or maliciously invalid) potential
ISO8601 strings, but `g_date_time_new_from_iso8601()` needs to be robust
against that.
Prevent `length` overflowing by correctly defining it as a `size_t`.
Similarly for `date_length`, but additionally track its validity in a
boolean rather than as its sign.
Spotted by chamalsl as #YWH-PGM9867-43.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
---
glib/gdatetime.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/glib/gdatetime.c b/glib/gdatetime.c
index a43efab0b..c42cbca8c 100644
--- a/glib/gdatetime.c
+++ b/glib/gdatetime.c
@@ -1492,7 +1492,8 @@ parse_iso8601_time (const gchar *text, gsize length,
GDateTime *
g_date_time_new_from_iso8601 (const gchar *text, GTimeZone *default_tz)
{
- gint length, date_length = -1;
+ size_t length, date_length = 0;
+ gboolean date_length_set = FALSE;
gint hour = 0, minute = 0;
gdouble seconds = 0.0;
GTimeZone *tz = NULL;
@@ -1503,11 +1504,14 @@ g_date_time_new_from_iso8601 (const gchar *text, GTimeZone *default_tz)
/* Count length of string and find date / time separator ('T', 't', or ' ') */
for (length = 0; text[length] != '\0'; length++)
{
- if (date_length < 0 && (text[length] == 'T' || text[length] == 't' || text[length] == ' '))
- date_length = length;
+ if (!date_length_set && (text[length] == 'T' || text[length] == 't' || text[length] == ' '))
+ {
+ date_length = length;
+ date_length_set = TRUE;
+ }
}
- if (date_length < 0)
+ if (!date_length_set)
return NULL;
if (!parse_iso8601_time (text + date_length + 1, length - (date_length + 1),
--
2.30.2
From 1b9f28bb3d1900c725edcd5ff13a6257cc089839 Mon Sep 17 00:00:00 2001
From: Philip Withnall <pwithnall@gnome.org>
Date: Tue, 18 Feb 2025 16:51:36 +0000
Subject: gdatetime: Fix potential integer overflow in timezone offset handling
This one is much harder to trigger than the one in the previous commit,
but mixing `gssize` and `gsize` always runs the risk of the former
overflowing for very (very very) long input strings.
Avoid that possibility by not using the sign of the `tz_offset` to
indicate its validity, and instead using the return value of the
function.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
---
glib/gdatetime.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/glib/gdatetime.c b/glib/gdatetime.c
index c42cbca8c..b410fb9f9 100644
--- a/glib/gdatetime.c
+++ b/glib/gdatetime.c
@@ -1341,8 +1341,10 @@ parse_iso8601_date (const gchar *text, gsize length,
return FALSE;
}
+/* Value returned in tz_offset is valid if and only if the function return value
+ * is non-NULL. */
static GTimeZone *
-parse_iso8601_timezone (const gchar *text, gsize length, gssize *tz_offset)
+parse_iso8601_timezone (const gchar *text, gsize length, size_t *tz_offset)
{
gint i, tz_length, offset_hours, offset_minutes;
gint offset_sign = 1;
@@ -1410,11 +1412,11 @@ static gboolean
parse_iso8601_time (const gchar *text, gsize length,
gint *hour, gint *minute, gdouble *seconds, GTimeZone **tz)
{
- gssize tz_offset = -1;
+ size_t tz_offset = 0;
/* Check for timezone suffix */
*tz = parse_iso8601_timezone (text, length, &tz_offset);
- if (tz_offset >= 0)
+ if (*tz != NULL)
length = tz_offset;
/* hh:mm:ss(.sss) */
--
2.30.2
From aae5ff8dac5371e951a2592ca9c392f17e1a3892 Mon Sep 17 00:00:00 2001
From: Philip Withnall <pwithnall@gnome.org>
Date: Tue, 18 Feb 2025 16:55:18 +0000
Subject: gdatetime: Track timezone length as an unsigned size_t
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
It’s guaranteed to be in (0, length] by the calculations above.
This avoids the possibility of integer overflow through `gssize` not
being as big as `size_t`.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
---
glib/gdatetime.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/glib/gdatetime.c b/glib/gdatetime.c
index b410fb9f9..5d10c29bc 100644
--- a/glib/gdatetime.c
+++ b/glib/gdatetime.c
@@ -1346,7 +1346,8 @@ parse_iso8601_date (const gchar *text, gsize length,
static GTimeZone *
parse_iso8601_timezone (const gchar *text, gsize length, size_t *tz_offset)
{
- gint i, tz_length, offset_hours, offset_minutes;
+ size_t tz_length;
+ gint i, offset_hours, offset_minutes;
gint offset_sign = 1;
GTimeZone *tz;
--
2.30.2
From 65beb5b44ee4f51472ecb42b4c423bb1e8f57af9 Mon Sep 17 00:00:00 2001
From: Philip Withnall <pwithnall@gnome.org>
Date: Tue, 18 Feb 2025 17:07:24 +0000
Subject: gdatetime: Factor out some string pointer arithmetic
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Makes the following code a little clearer, but doesn’t introduce any
functional changes.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
---
glib/gdatetime.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)
diff --git a/glib/gdatetime.c b/glib/gdatetime.c
index 5d10c29bc..5d02c8738 100644
--- a/glib/gdatetime.c
+++ b/glib/gdatetime.c
@@ -1350,6 +1350,7 @@ parse_iso8601_timezone (const gchar *text, gsize length, size_t *tz_offset)
gint i, offset_hours, offset_minutes;
gint offset_sign = 1;
GTimeZone *tz;
+ const char *tz_start;
/* UTC uses Z suffix */
if (length > 0 && text[length - 1] == 'Z')
@@ -1367,34 +1368,35 @@ parse_iso8601_timezone (const gchar *text, gsize length, size_t *tz_offset)
}
if (i < 0)
return NULL;
+ tz_start = text + i;
tz_length = length - i;
/* +hh:mm or -hh:mm */
- if (tz_length == 6 && text[i+3] == ':')
+ if (tz_length == 6 && tz_start[3] == ':')
{
- if (!get_iso8601_int (text + i + 1, 2, &offset_hours) ||
- !get_iso8601_int (text + i + 4, 2, &offset_minutes))
+ if (!get_iso8601_int (tz_start + 1, 2, &offset_hours) ||
+ !get_iso8601_int (tz_start + 4, 2, &offset_minutes))
return NULL;
}
/* +hhmm or -hhmm */
else if (tz_length == 5)
{
- if (!get_iso8601_int (text + i + 1, 2, &offset_hours) ||
- !get_iso8601_int (text + i + 3, 2, &offset_minutes))
+ if (!get_iso8601_int (tz_start + 1, 2, &offset_hours) ||
+ !get_iso8601_int (tz_start + 3, 2, &offset_minutes))
return NULL;
}
/* +hh or -hh */
else if (tz_length == 3)
{
- if (!get_iso8601_int (text + i + 1, 2, &offset_hours))
+ if (!get_iso8601_int (tz_start + 1, 2, &offset_hours))
return NULL;
offset_minutes = 0;
}
else
return NULL;
- *tz_offset = i;
- tz = g_time_zone_new (text + i);
+ *tz_offset = tz_start - text;
+ tz = g_time_zone_new (tz_start);
/* Double-check that the GTimeZone matches our interpretation of the timezone.
* This can fail because our interpretation is less strict than (for example)
--
2.30.2
From 0df4f223046b56db6446d1458c8a3fe61b3fed00 Mon Sep 17 00:00:00 2001
From: Philip Withnall <pwithnall@gnome.org>
Date: Tue, 18 Feb 2025 17:28:33 +0000
Subject: gdatetime: Factor out an undersized variable
For long input strings, it would have been possible for `i` to overflow.
Avoid that problem by using the `tz_length` instead, so that we count up
rather than down.
This commit introduces no functional changes (outside of changing
undefined behaviour), and can be verified using the identity
`i === length - tz_length`.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
---
glib/gdatetime.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/glib/gdatetime.c b/glib/gdatetime.c
index 5d02c8738..1ecb6e0b3 100644
--- a/glib/gdatetime.c
+++ b/glib/gdatetime.c
@@ -1347,7 +1347,7 @@ static GTimeZone *
parse_iso8601_timezone (const gchar *text, gsize length, size_t *tz_offset)
{
size_t tz_length;
- gint i, offset_hours, offset_minutes;
+ gint offset_hours, offset_minutes;
gint offset_sign = 1;
GTimeZone *tz;
const char *tz_start;
@@ -1360,16 +1360,15 @@ parse_iso8601_timezone (const gchar *text, gsize length, size_t *tz_offset)
}
/* Look for '+' or '-' of offset */
- for (i = length - 1; i >= 0; i--)
- if (text[i] == '+' || text[i] == '-')
+ for (tz_length = 1; tz_length <= length; tz_length++)
+ if (text[length - tz_length] == '+' || text[length - tz_length] == '-')
{
- offset_sign = text[i] == '-' ? -1 : 1;
+ offset_sign = text[length - tz_length] == '-' ? -1 : 1;
break;
}
- if (i < 0)
+ if (tz_length > length)
return NULL;
- tz_start = text + i;
- tz_length = length - i;
+ tz_start = text + length - tz_length;
/* +hh:mm or -hh:mm */
if (tz_length == 6 && tz_start[3] == ':')
--
2.30.2
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