This test added in base 31cf95cec738bdb51a652689e2f829addc3b984b and MFC'd to stable/13 in base 598e53b3d39c5b8453151080db3ccc263a04330f , it crashes an i386 VM in bhyve.
Created attachment 235951 [details] reproduce code
A commit in branch main references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=c04721e35ff0e8220c88d5b10f068dba18629f7e commit c04721e35ff0e8220c88d5b10f068dba18629f7e Author: Li-Wen Hsu <lwhsu@FreeBSD.org> AuthorDate: 2022-08-16 22:03:37 +0000 Commit: Li-Wen Hsu <lwhsu@FreeBSD.org> CommitDate: 2022-08-16 22:03:37 +0000 basic_signal test: temporarily skip trap_signal_test on i386 This case crashes a bhyve VM. PR: 265889 Sponsored by: The FreeBSD Foundation tests/sys/kern/basic_signal.c | 4 ++++ 1 file changed, 4 insertions(+)
A commit in branch main references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=beeeb40bca06c8ebc8953274bbc5759fb432fab2 commit beeeb40bca06c8ebc8953274bbc5759fb432fab2 Author: Li-Wen Hsu <lwhsu@FreeBSD.org> AuthorDate: 2022-08-17 00:15:10 +0000 Commit: Li-Wen Hsu <lwhsu@FreeBSD.org> CommitDate: 2022-08-17 00:15:10 +0000 basic_signal test: really skip trap_signal_test on i386 PR: 265889 Fixes: c04721e35ff0e8220c88d5b10f068dba18629f7e Sponsored by: The FreeBSD Foundation tests/sys/kern/basic_signal.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
A commit in branch stable/13 references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=66ea3876d70b7a205f64962d743324f65edec22e commit 66ea3876d70b7a205f64962d743324f65edec22e Author: Li-Wen Hsu <lwhsu@FreeBSD.org> AuthorDate: 2022-08-16 22:03:37 +0000 Commit: Li-Wen Hsu <lwhsu@FreeBSD.org> CommitDate: 2022-08-17 00:18:46 +0000 basic_signal test: temporarily skip trap_signal_test on i386 This case crashes a bhyve VM. PR: 265889 Sponsored by: The FreeBSD Foundation (cherry picked from commit c04721e35ff0e8220c88d5b10f068dba18629f7e) (cherry picked from commit beeeb40bca06c8ebc8953274bbc5759fb432fab2) tests/sys/kern/basic_signal.c | 4 ++++ 1 file changed, 4 insertions(+)
A commit in branch main references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=dc4a2d1d0e838579f21d9d1fef8655f902f06ab2 commit dc4a2d1d0e838579f21d9d1fef8655f902f06ab2 Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2022-08-19 01:26:37 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2022-08-24 19:11:57 +0000 i386: do not allow userspace to set tf_trapno on sigreturn(2) tf_trapno is checked on return from interrupt/exception to determine if special handling is needed for switching address space. This is due to the possibility of NMI/MCHK/DBG to occur at arbitrary place in kernel, where both address space and stack used could be transient. Kernel saves current %cr3 in tf_err for such events, to restore on return. If user is able to set tf_trapno, it can trigger that special handling, and since tf_err is also user-controlled by sigreturn(2), the result is undefined. PR: 265889 Reported by: lwhsu Reviewed by: jhb Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D36302 sys/i386/i386/exec_machdep.c | 3 +++ 1 file changed, 3 insertions(+)
A commit in branch main references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=9ea2716b7758b72725b932f1ad9f3457a69cbea6 commit 9ea2716b7758b72725b932f1ad9f3457a69cbea6 Author: Li-Wen Hsu <lwhsu@FreeBSD.org> AuthorDate: 2022-08-25 04:09:00 +0000 Commit: Li-Wen Hsu <lwhsu@FreeBSD.org> CommitDate: 2022-08-25 04:09:00 +0000 Reenable basic_signal:trap_signal_test on i386 This is fixed in dc4a2d1d0e838579f21d9d1fef8655f902f06ab2 PR: 265889 Sponsored by: The FreeBSD Foundation MFC with: dc4a2d1d0e838579f21d9d1fef8655f902f06ab2 tests/sys/kern/basic_signal.c | 4 ---- 1 file changed, 4 deletions(-)
A commit in branch stable/13 references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=cd304fdbe95b844f4dff5cd40d213f6923c8767b commit cd304fdbe95b844f4dff5cd40d213f6923c8767b Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2022-08-19 01:26:37 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2022-08-31 01:20:27 +0000 i386: do not allow userspace to set tf_trapno on sigreturn(2) PR: 265889 (cherry picked from commit dc4a2d1d0e838579f21d9d1fef8655f902f06ab2) sys/i386/i386/exec_machdep.c | 3 +++ 1 file changed, 3 insertions(+)
A commit in branch stable/13 references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=af3ccd7b6d427ab2d419b8500d71392ead2e7eb9 commit af3ccd7b6d427ab2d419b8500d71392ead2e7eb9 Author: Li-Wen Hsu <lwhsu@FreeBSD.org> AuthorDate: 2022-08-25 04:09:00 +0000 Commit: Li-Wen Hsu <lwhsu@FreeBSD.org> CommitDate: 2022-11-09 19:34:02 +0000 Reenable basic_signal:trap_signal_test on i386 This is fixed in dc4a2d1d0e838579f21d9d1fef8655f902f06ab2 PR: 265889 Sponsored by: The FreeBSD Foundation MFC with: dc4a2d1d0e838579f21d9d1fef8655f902f06ab2 (cherry picked from commit 9ea2716b7758b72725b932f1ad9f3457a69cbea6) tests/sys/kern/basic_signal.c | 4 ---- 1 file changed, 4 deletions(-)