72 lines
1.9 KiB
Diff
72 lines
1.9 KiB
Diff
From 628b2b2bafa5d3a2017193ddf375093e70666059 Mon Sep 17 00:00:00 2001
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From: Ariadne Conill <ariadne@dereferenced.org>
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Date: Fri, 20 Jan 2023 22:07:03 +0000
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Subject: [PATCH] tuple: test for, and stop string processing, on truncation
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otherwise a buffer overflow occurs.
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this has been a bug in pkgconf since the beginning, it seems.
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instead of disclosing the bug correctly, a "hotshot" developer
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decided to blog about it instead. sigh.
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https://nullprogram.com/blog/2023/01/18/
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---
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libpkgconf/tuple.c | 28 +++++++++++++++++++++++-----
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1 file changed, 23 insertions(+), 5 deletions(-)
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diff --git a/libpkgconf/tuple.c b/libpkgconf/tuple.c
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index 2d550d8..b831070 100644
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--- a/libpkgconf/tuple.c
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+++ b/libpkgconf/tuple.c
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@@ -293,12 +293,21 @@ pkgconf_tuple_parse(const pkgconf_client_t *client, pkgconf_list_t *vars, const
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}
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}
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+ size_t remain = PKGCONF_BUFSIZE - (bptr - buf);
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ptr += (pptr - ptr);
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kv = pkgconf_tuple_find_global(client, varname);
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if (kv != NULL)
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{
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- strncpy(bptr, kv, PKGCONF_BUFSIZE - (bptr - buf));
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- bptr += strlen(kv);
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+ size_t nlen = pkgconf_strlcpy(bptr, kv, remain);
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+ if (nlen > remain)
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+ {
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+ pkgconf_warn(client, "warning: truncating very long variable to 64KB\n");
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+
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+ bptr = buf + (PKGCONF_BUFSIZE - 1);
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+ break;
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+ }
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+
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+ bptr += nlen;
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}
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else
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{
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@@ -306,12 +315,21 @@ pkgconf_tuple_parse(const pkgconf_client_t *client, pkgconf_list_t *vars, const
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if (kv != NULL)
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{
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+ size_t nlen;
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+
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parsekv = pkgconf_tuple_parse(client, vars, kv);
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+ nlen = pkgconf_strlcpy(bptr, parsekv, remain);
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+ free(parsekv);
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- strncpy(bptr, parsekv, PKGCONF_BUFSIZE - (bptr - buf));
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- bptr += strlen(parsekv);
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+ if (nlen > remain)
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+ {
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+ pkgconf_warn(client, "warning: truncating very long variable to 64KB\n");
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- free(parsekv);
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+ bptr = buf + (PKGCONF_BUFSIZE - 1);
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+ break;
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+ }
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+
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+ bptr += nlen;
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}
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}
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}
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--
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2.33.0
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