Date: Thu, 06 Aug 2026 15:01:45 +0000 From: Mark Johnston <markj@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 78dfadaa0618 - stable/15 - ppp: Avoid overflow when formatting endpoint discriminator options Message-ID: <6a74a1d9.45dae.3c1d264@gitrepo.freebsd.org>
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The branch stable/15 has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=78dfadaa0618e8b261e813f13f563563dd0ee535 commit 78dfadaa0618e8b261e813f13f563563dd0ee535 Author: Mark Johnston <markj@FreeBSD.org> AuthorDate: 2026-08-03 15:18:25 +0000 Commit: Mark Johnston <markj@FreeBSD.org> CommitDate: 2026-08-06 13:24:43 +0000 ppp: Avoid overflow when formatting endpoint discriminator options Each byte of the address is represented by a pair of characters, so we should be multiplying len by 2 when figuring out how much buffer space we have. Previously, a sufficiently large option could cause an overflow of the global "result" buffer. Reported by: Joshua Rogers <joshua@joshua.hu> Tested by: Décio Brandão (0xDBJ) MFC after: 3 days Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D58555 (cherry picked from commit e004ff15f87e6aa8f2aa13cd5600ae13457b95f1) --- usr.sbin/ppp/mp.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/usr.sbin/ppp/mp.c b/usr.sbin/ppp/mp.c index 84ddb6e053e3..f5f9dd9ddece 100644 --- a/usr.sbin/ppp/mp.c +++ b/usr.sbin/ppp/mp.c @@ -931,10 +931,10 @@ mp_Enddisc(u_char c, const char *address, size_t len) case ENDDISC_MAGIC: sprintf(result, "Magic: 0x"); header = strlen(result); - if (len + header + 1 > sizeof result) - len = sizeof result - header - 1; + if (2 * len + header + 1 > sizeof result) + len = (sizeof result - header - 1) / 2; for (f = 0; f < len; f++) - sprintf(result + header + 2 * f, "%02x", address[f]); + sprintf(result + header + 2 * f, "%02x", (unsigned char)address[f]); break; case ENDDISC_PSN: @@ -944,10 +944,10 @@ mp_Enddisc(u_char c, const char *address, size_t len) default: sprintf(result, "%d: ", (int)c); header = strlen(result); - if (len + header + 1 > sizeof result) - len = sizeof result - header - 1; + if (2 * len + header + 1 > sizeof result) + len = (sizeof result - header - 1) / 2; for (f = 0; f < len; f++) - sprintf(result + header + 2 * f, "%02x", address[f]); + sprintf(result + header + 2 * f, "%02x", (unsigned char)address[f]); break; } return result;home | help
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