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From b6036e23b0477be147211b4e21a6b49cd4d6c9a0 Mon Sep 17 00:00:00 2001
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From: Jamie Bainbridge <jamie.bainbridge@gmail.com>
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Date: Wed, 8 Sep 2021 12:08:17 +1000
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Subject: [PATCH] gutils: Avoid segfault in g_get_user_database_entry
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g_get_user_database_entry() uses variable pwd to store the contents of
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the call to getpwnam_r(), then capitalises the first letter of pw_name
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with g_ascii_toupper (pw->pw_name[0]).
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However, as per the getpwnam manpage, the result of that call "may point
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to a static area". When this happens, GLib is trying to edit static
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memory which belongs to a shared library, so segfaults.
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Instead, copy pw_name off to a temporary variable, set uppercase on
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that variable, and use the variable to join into the desired string.
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Free the new variable after it is no longer needed.
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Signed-off-by: Jamie Bainbridge <jamie.bainbridge@gmail.com>
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---
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glib/gutils.c | 7 +++++--
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1 file changed, 5 insertions(+), 2 deletions(-)
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diff --git a/glib/gutils.c b/glib/gutils.c
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index b7a2113d4..4bccd7229 100644
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--- a/glib/gutils.c
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+++ b/glib/gutils.c
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@@ -692,14 +692,17 @@ g_get_user_database_entry (void)
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{
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gchar **gecos_fields;
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gchar **name_parts;
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+ gchar *uppercase_pw_name;
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/* split the gecos field and substitute '&' */
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gecos_fields = g_strsplit (pw->pw_gecos, ",", 0);
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name_parts = g_strsplit (gecos_fields[0], "&", 0);
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- pw->pw_name[0] = g_ascii_toupper (pw->pw_name[0]);
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- e.real_name = g_strjoinv (pw->pw_name, name_parts);
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+ uppercase_pw_name = g_strdup (pw->pw_name);
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+ uppercase_pw_name[0] = g_ascii_toupper (uppercase_pw_name[0]);
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+ e.real_name = g_strjoinv (uppercase_pw_name, name_parts);
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g_strfreev (gecos_fields);
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g_strfreev (name_parts);
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+ g_free (uppercase_pw_name);
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}
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#endif
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--
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GitLab
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