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Xin Li (Intel) cdc1749775 selftests/x86: Add a test to detect infinite SIGTRAP handler loop 
commit f287822688 upstream.

When FRED is enabled, if the Trap Flag (TF) is set without an external
debugger attached, it can lead to an infinite loop in the SIGTRAP
handler.  To avoid this, the software event flag in the augmented SS
must be cleared, ensuring that no single-step trap remains pending when
ERETU completes.

This test checks for that specific scenario—verifying whether the kernel
correctly prevents an infinite SIGTRAP loop in this edge case when FRED
is enabled.

The test should _always_ pass with IDT event delivery, thus no need to
disable the test even when FRED is not enabled.

Signed-off-by: Xin Li (Intel) <xin@zytor.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Tested-by: Sohil Mehta <sohil.mehta@intel.com>
Cc:stable@vger.kernel.org
Link: https://lore.kernel.org/all/20250609084054.2083189-3-xin%40zytor.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-06-27 11:07:37 +01:00
..
crypto/chacha20-s390 tools/testing/crypto: Use vzalloc instead of vmalloc+memset 2022-07-05 14:46:36 +02:00
cxl cxl/test: Add missing vmalloc.h for tools/testing/cxl/test/mem.c 2024-06-21 14:35:45 +02:00
fault-injection docs: fault-injection: convert docs to ReST and rename to *.rst 2019-06-14 14:21:07 -06:00
ktest ktest: Fix Test Failures Due to Missing LOG_FILE Directories 2025-04-25 10:43:34 +02:00
kunit kunit: tool: Use qboot on QEMU x86_64 2025-06-04 14:40:14 +02:00
memblock memblock tests: fix warning ‘struct seq_file’ declared inside parameter list 2023-10-06 14:56:56 +02:00
nvdimm ndtest: Cleanup all of blk namespace specific code 2022-07-12 17:57:55 -07:00
radix-tree test suite: use %zu to print size_t 2025-04-25 10:43:50 +02:00
scatterlist tools/testing/scatterlist: add missing defines 2022-01-30 09:56:58 +02:00
selftests selftests/x86: Add a test to detect infinite SIGTRAP handler loop 2025-06-27 11:07:37 +01:00
vsock vsock_test: POLLIN + SO_RCVLOWAT test 2022-08-23 10:43:12 +02:00