From: Jan Polensky <japo@linux.ibm.com>
To: ltp@lists.linux.it
Subject: [LTP] [PATCH v1 0/3] Separate ptrace tests for CONFIG_PROC_MEM_FORCE_PTRACE
Date: Tue, 14 Jul 2026 17:06:27 +0200 [thread overview]
Message-ID: <20260714150631.250972-1-japo@linux.ibm.com> (raw)
thp04 is a CVE-2017-1000405 regression test. If direct
/proc/self/mem writes are blocked by CONFIG_PROC_MEM_FORCE_PTRACE=y,
the CVE cannot be triggered and thp04 should report TCONF.
Add separate ptrace tests for the CONFIG_PROC_MEM_FORCE_PTRACE behavior
instead:
- ptrace12 checks that writing to /proc/self/mem is rejected with EIO.
- ptrace13 checks that a parent can write to a traced child's memory via
/proc/pid/mem.
Both ptrace tests use read-only mappings, so the writes require
FOLL_FORCE and exercise the CONFIG_PROC_MEM_FORCE_PTRACE enforcement.
Validated on s390x with CONFIG_PROC_MEM_FORCE_PTRACE=y:
- ptrace12: TPASS
- ptrace13: TPASS, 100 iterations
Follow-up to the previous thp04 ptrace mode discussion:
https://lore.kernel.org/all/20260709175927.268677-1-japo@linux.ibm.com/
Jan Polensky (3):
thp04: Simplify to focus on CVE-2017-1000405 race test only
ptrace: add test for /proc/self/mem write rejection
ptrace: add test for /proc/pid/mem writes under ptrace
testcases/kernel/mem/thp/thp04.c | 166 +++++++++-----
testcases/kernel/syscalls/ptrace/.gitignore | 2 +
testcases/kernel/syscalls/ptrace/ptrace12.c | 99 ++++++++
testcases/kernel/syscalls/ptrace/ptrace13.c | 236 ++++++++++++++++++++
4 files changed, 450 insertions(+), 53 deletions(-)
create mode 100644 testcases/kernel/syscalls/ptrace/ptrace12.c
create mode 100644 testcases/kernel/syscalls/ptrace/ptrace13.c
base-commit: d139524b04d360c4dabaee61a6066a9a52b0e454
prerequisite-patch-id: fb884fb8843ffadb56383142ca39c8f3f2db898d
prerequisite-patch-id: 16fc00d302aefbf6fb17e972a4390341bfbb0e50
prerequisite-patch-id: 6e77ef09b2259daae915f4a4895bf0879b7b7211
prerequisite-patch-id: 1d13f676c1c1b9b37e97b1e18ae75611a3516f96
prerequisite-patch-id: 11b8f2b102029b41838899f2a78132b50cac12a0
prerequisite-patch-id: 811e85d9a4158f72559de5f551ad93f109362c96
--
2.55.0
--
Mailing list info: https://lists.linux.it/listinfo/ltp
next reply other threads:[~2026-07-14 15:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-14 15:06 Jan Polensky [this message]
2026-07-14 15:06 ` [LTP] [PATCH v1 1/3] thp04: Simplify to focus on CVE-2017-1000405 race test only Jan Polensky
2026-07-14 16:26 ` [LTP] " linuxtestproject.agent
2026-07-14 15:06 ` [LTP] [PATCH v1 2/3] ptrace: add test for /proc/self/mem write rejection Jan Polensky
2026-07-14 15:06 ` [LTP] [PATCH v1 3/3] ptrace: add test for /proc/pid/mem writes under ptrace Jan Polensky
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