December 2020 - Linux-kselftest-mirror

[PATCH AUTOSEL 4.19 13/87] torture: Prevent jitter processes from delaying failed run

by Sasha Levin

From: "Paul E. McKenney" <paulmck(a)kernel.org> [ Upstream commit c64659ef29e3901be0900ec6fb0485fa3dbdcfd8 ] Even when the kernel panics and qemu dies, runs with jitter enabled will continue uselessly until the jitter.sh processes terminate. This can be annoying if a planned one-hour run instead dies during boot. This commit therefore kills the jitter.sh processes when the run ends more than one minute prior to the termination time specified by the kvm.sh --duration argument or its default. Signed-off-by: Paul E. McKenney <paulmck(a)kernel.org> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- .../selftests/rcutorture/bin/kvm-test-1-run.sh | 14 ++++++++++++++ tools/testing/selftests/rcutorture/bin/kvm.sh | 5 ++++- 2 files changed, 18 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh index f7247ee00514d..73cba8d13179c 100755 --- a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh +++ b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh @@ -216,6 +216,20 @@ do echo "ps -fp $killpid" >> $resdir/Warnings 2>&1 ps -fp $killpid >> $resdir/Warnings 2>&1 fi + # Reduce probability of PID reuse by allowing a one-minute buffer + if test $((kruntime + 60)) -lt $seconds && test -s "$resdir/../jitter_pids" + then + awk < "$resdir/../jitter_pids" ' + NF > 0 { + pidlist = pidlist " " $1; + n++; + } + END { + if (n > 0) { + print "kill " pidlist; + } + }' | sh + fi else echo ' ---' `date`: "Kernel done" fi diff --git a/tools/testing/selftests/rcutorture/bin/kvm.sh b/tools/testing/selftests/rcutorture/bin/kvm.sh index 5a7a62d76a50b..02fd8a19fa7ea 100755 --- a/tools/testing/selftests/rcutorture/bin/kvm.sh +++ b/tools/testing/selftests/rcutorture/bin/kvm.sh @@ -401,8 +401,11 @@ function dump(first, pastlast, batchnum) print "if test -n \"$needqemurun\"" print "then" print "\techo ---- Starting kernels. `date` | tee -a " rd "log"; - for (j = 0; j < njitter; j++) + print "\techo > " rd "jitter_pids" + for (j = 0; j < njitter; j++) { print "\tjitter.sh " j " " dur " " ja[2] " " ja[3] "&" + print "\techo $! >> " rd "jitter_pids" + } print "\twait" print "\techo ---- All kernel runs complete. `date` | tee -a " rd "log"; print "else" -- 2.27.0

4 years

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[PATCH AUTOSEL 5.4 066/130] selftests/x86/fsgsbase: Fix GS == 1, 2, and 3 tests

by Sasha Levin

From: Andy Lutomirski <luto(a)kernel.org> [ Upstream commit 716572b0003ef67a4889bd7d85baf5099c5a0248 ] Setting GS to 1, 2, or 3 causes a nonsensical part of the IRET microcode to change GS back to zero on a return from kernel mode to user mode. The result is that these tests fail randomly depending on when interrupts happen. Detect when this happens and let the test pass. Signed-off-by: Andy Lutomirski <luto(a)kernel.org> Signed-off-by: Borislav Petkov <bp(a)suse.de> Link: https://lkml.kernel.org/r/7567fd44a1d60a9424f25b19a998f12149993b0d.16043465… Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- tools/testing/selftests/x86/fsgsbase.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/x86/fsgsbase.c b/tools/testing/selftests/x86/fsgsbase.c index 757bdb218a661..f2916838a7eb5 100644 --- a/tools/testing/selftests/x86/fsgsbase.c +++ b/tools/testing/selftests/x86/fsgsbase.c @@ -391,8 +391,8 @@ static void set_gs_and_switch_to(unsigned long local, local = read_base(GS); /* - * Signal delivery seems to mess up weird selectors. Put it - * back. + * Signal delivery is quite likely to change a selector + * of 1, 2, or 3 back to 0 due to IRET being defective. */ asm volatile ("mov %0, %%gs" : : "rm" (force_sel)); } else { @@ -410,6 +410,14 @@ static void set_gs_and_switch_to(unsigned long local, if (base == local && sel_pre_sched == sel_post_sched) { printf("[OK]\tGS/BASE remained 0x%hx/0x%lx\n", sel_pre_sched, local); + } else if (base == local && sel_pre_sched >= 1 && sel_pre_sched <= 3 && + sel_post_sched == 0) { + /* + * IRET is misdesigned and will squash selectors 1, 2, or 3 + * to zero. Don't fail the test just because this happened. + */ + printf("[OK]\tGS/BASE changed from 0x%hx/0x%lx to 0x%hx/0x%lx because IRET is defective\n", + sel_pre_sched, local, sel_post_sched, base); } else { nerrs++; printf("[FAIL]\tGS/BASE changed from 0x%hx/0x%lx to 0x%hx/0x%lx\n", -- 2.27.0

4 years

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[PATCH AUTOSEL 5.4 021/130] torture: Prevent jitter processes from delaying failed run

by Sasha Levin

From: "Paul E. McKenney" <paulmck(a)kernel.org> [ Upstream commit c64659ef29e3901be0900ec6fb0485fa3dbdcfd8 ] Even when the kernel panics and qemu dies, runs with jitter enabled will continue uselessly until the jitter.sh processes terminate. This can be annoying if a planned one-hour run instead dies during boot. This commit therefore kills the jitter.sh processes when the run ends more than one minute prior to the termination time specified by the kvm.sh --duration argument or its default. Signed-off-by: Paul E. McKenney <paulmck(a)kernel.org> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- .../selftests/rcutorture/bin/kvm-test-1-run.sh | 14 ++++++++++++++ tools/testing/selftests/rcutorture/bin/kvm.sh | 5 ++++- 2 files changed, 18 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh index 33c6696197364..a0e01a69d0d25 100755 --- a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh +++ b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh @@ -197,6 +197,20 @@ do echo "ps -fp $killpid" >> $resdir/Warnings 2>&1 ps -fp $killpid >> $resdir/Warnings 2>&1 fi + # Reduce probability of PID reuse by allowing a one-minute buffer + if test $((kruntime + 60)) -lt $seconds && test -s "$resdir/../jitter_pids" + then + awk < "$resdir/../jitter_pids" ' + NF > 0 { + pidlist = pidlist " " $1; + n++; + } + END { + if (n > 0) { + print "kill " pidlist; + } + }' | sh + fi else echo ' ---' `date`: "Kernel done" fi diff --git a/tools/testing/selftests/rcutorture/bin/kvm.sh b/tools/testing/selftests/rcutorture/bin/kvm.sh index 72518580df236..a9a6f81d9564c 100755 --- a/tools/testing/selftests/rcutorture/bin/kvm.sh +++ b/tools/testing/selftests/rcutorture/bin/kvm.sh @@ -404,8 +404,11 @@ function dump(first, pastlast, batchnum) print "if test -n \"$needqemurun\"" print "then" print "\techo ---- Starting kernels. `date` | tee -a " rd "log"; - for (j = 0; j < njitter; j++) + print "\techo > " rd "jitter_pids" + for (j = 0; j < njitter; j++) { print "\tjitter.sh " j " " dur " " ja[2] " " ja[3] "&" + print "\techo $! >> " rd "jitter_pids" + } print "\twait" print "\techo ---- All kernel runs complete. `date` | tee -a " rd "log"; print "else" -- 2.27.0

4 years

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[PATCH AUTOSEL 5.10 046/217] torture: Prevent jitter processes from delaying failed run

by Sasha Levin

From: "Paul E. McKenney" <paulmck(a)kernel.org> [ Upstream commit c64659ef29e3901be0900ec6fb0485fa3dbdcfd8 ] Even when the kernel panics and qemu dies, runs with jitter enabled will continue uselessly until the jitter.sh processes terminate. This can be annoying if a planned one-hour run instead dies during boot. This commit therefore kills the jitter.sh processes when the run ends more than one minute prior to the termination time specified by the kvm.sh --duration argument or its default. Signed-off-by: Paul E. McKenney <paulmck(a)kernel.org> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- .../selftests/rcutorture/bin/kvm-test-1-run.sh | 14 ++++++++++++++ tools/testing/selftests/rcutorture/bin/kvm.sh | 5 ++++- 2 files changed, 18 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh index 6dc2b49b85ea0..6544a289a5832 100755 --- a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh +++ b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh @@ -223,6 +223,20 @@ do echo "ps -fp $killpid" >> $resdir/Warnings 2>&1 ps -fp $killpid >> $resdir/Warnings 2>&1 fi + # Reduce probability of PID reuse by allowing a one-minute buffer + if test $((kruntime + 60)) -lt $seconds && test -s "$resdir/../jitter_pids" + then + awk < "$resdir/../jitter_pids" ' + NF > 0 { + pidlist = pidlist " " $1; + n++; + } + END { + if (n > 0) { + print "kill " pidlist; + } + }' | sh + fi else echo ' ---' `date`: "Kernel done" fi diff --git a/tools/testing/selftests/rcutorture/bin/kvm.sh b/tools/testing/selftests/rcutorture/bin/kvm.sh index 6eb1d3f6524d5..5ad3882563ce6 100755 --- a/tools/testing/selftests/rcutorture/bin/kvm.sh +++ b/tools/testing/selftests/rcutorture/bin/kvm.sh @@ -459,8 +459,11 @@ function dump(first, pastlast, batchnum) print "if test -n \"$needqemurun\"" print "then" print "\techo ---- Starting kernels. `date` | tee -a " rd "log"; - for (j = 0; j < njitter; j++) + print "\techo > " rd "jitter_pids" + for (j = 0; j < njitter; j++) { print "\tjitter.sh " j " " dur " " ja[2] " " ja[3] "&" + print "\techo $! >> " rd "jitter_pids" + } print "\twait" print "\techo ---- All kernel runs complete. `date` | tee -a " rd "log"; print "else" -- 2.27.0

4 years

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[PATCH AUTOSEL 5.4 08/10] selftests/bpf: Fix array access with signed variable test

by Sasha Levin

From: Jean-Philippe Brucker <jean-philippe(a)linaro.org> [ Upstream commit 77ce220c0549dcc3db8226c61c60e83fc59dfafc ] The test fails because of a recent fix to the verifier, even though this program is valid. In details what happens is: 7: (61) r1 = *(u32 *)(r0 +0) Load a 32-bit value, with signed bounds [S32_MIN, S32_MAX]. The bounds of the 64-bit value are [0, U32_MAX]... 8: (65) if r1 s> 0xffffffff goto pc+1 ... therefore this is always true (the operand is sign-extended). 10: (b4) w2 = 11 11: (6d) if r2 s> r1 goto pc+1 When true, the 64-bit bounds become [0, 10]. The 32-bit bounds are still [S32_MIN, 10]. 13: (64) w1 <<= 2 Because this is a 32-bit operation, the verifier propagates the new 32-bit bounds to the 64-bit ones, and the knowledge gained from insn 11 is lost. 14: (0f) r0 += r1 15: (7a) *(u64 *)(r0 +0) = 4 Then the verifier considers r0 unbounded here, rejecting the test. To make the test work, change insn 8 to check the sign of the 32-bit value. Signed-off-by: Jean-Philippe Brucker <jean-philippe(a)linaro.org> Acked-by: John Fastabend <john.fastabend(a)gmail.com> Signed-off-by: Alexei Starovoitov <ast(a)kernel.org> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- tools/testing/selftests/bpf/verifier/array_access.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/verifier/array_access.c b/tools/testing/selftests/bpf/verifier/array_access.c index f3c33e128709b..a80d806ead15f 100644 --- a/tools/testing/selftests/bpf/verifier/array_access.c +++ b/tools/testing/selftests/bpf/verifier/array_access.c @@ -68,7 +68,7 @@ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem), BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 9), BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, 0), - BPF_JMP_IMM(BPF_JSGT, BPF_REG_1, 0xffffffff, 1), + BPF_JMP32_IMM(BPF_JSGT, BPF_REG_1, 0xffffffff, 1), BPF_MOV32_IMM(BPF_REG_1, 0), BPF_MOV32_IMM(BPF_REG_2, MAX_ENTRIES), BPF_JMP_REG(BPF_JSGT, BPF_REG_2, BPF_REG_1, 1), -- 2.27.0

4 years

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Re: [PATCH v3] Compiler Attributes: remove CONFIG_ENABLE_MUST_CHECK

by Miguel Ojeda

On Sat, Dec 12, 2020 at 5:18 PM Guenter Roeck <linux(a)roeck-us.net> wrote: > > This patch results in: > > arch/sh/kernel/cpu/sh4a/smp-shx3.c: In function 'shx3_prepare_cpus': > arch/sh/kernel/cpu/sh4a/smp-shx3.c:76:3: error: ignoring return value of 'request_irq' declared with attribute 'warn_unused_result' > > when building sh:defconfig. Checking for calls to request_irq() > suggests that there will be other similar errors in various builds. > Reverting the patch fixes the problem. Which ones? From a quick grep and some filtering I could only find one file with wrong usage apart from this one: drivers/net/ethernet/lantiq_etop.c: request_irq(irq, ltq_etop_dma_irq, 0, "etop_tx", priv); drivers/net/ethernet/lantiq_etop.c: request_irq(irq, ltq_etop_dma_irq, 0, "etop_rx", priv); Of course, this does not cover other functions, but it means there aren't many issues and/or people building the code if nobody complains within a few weeks. So I think we can fix them as they come. Cheers, Miguel

4 years

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[PATCH AUTOSEL 5.9 12/15] selftests/bpf: Fix "dubious pointer arithmetic" test

by Sasha Levin

From: Jean-Philippe Brucker <jean-philippe(a)linaro.org> [ Upstream commit 3615bdf6d9b19db12b1589861609b4f1c6a8d303 ] The verifier trace changed following a bugfix. After checking the 64-bit sign, only the upper bit mask is known, not bit 31. Update the test accordingly. Signed-off-by: Jean-Philippe Brucker <jean-philippe(a)linaro.org> Acked-by: John Fastabend <john.fastabend(a)gmail.com> Signed-off-by: Alexei Starovoitov <ast(a)kernel.org> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- tools/testing/selftests/bpf/prog_tests/align.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/align.c b/tools/testing/selftests/bpf/prog_tests/align.c index c548aded65859..2a15aa3d49c74 100644 --- a/tools/testing/selftests/bpf/prog_tests/align.c +++ b/tools/testing/selftests/bpf/prog_tests/align.c @@ -456,10 +456,10 @@ static struct bpf_align_test tests[] = { */ {7, "R5_w=inv(id=0,smin_value=-9223372036854775806,smax_value=9223372036854775806,umin_value=2,umax_value=18446744073709551614,var_off=(0x2; 0xfffffffffffffffc)"}, /* Checked s>=0 */ - {9, "R5=inv(id=0,umin_value=2,umax_value=9223372034707292158,var_off=(0x2; 0x7fffffff7ffffffc)"}, + {9, "R5=inv(id=0,umin_value=2,umax_value=9223372036854775806,var_off=(0x2; 0x7ffffffffffffffc)"}, /* packet pointer + nonnegative (4n+2) */ - {11, "R6_w=pkt(id=1,off=0,r=0,umin_value=2,umax_value=9223372034707292158,var_off=(0x2; 0x7fffffff7ffffffc)"}, - {13, "R4_w=pkt(id=1,off=4,r=0,umin_value=2,umax_value=9223372034707292158,var_off=(0x2; 0x7fffffff7ffffffc)"}, + {11, "R6_w=pkt(id=1,off=0,r=0,umin_value=2,umax_value=9223372036854775806,var_off=(0x2; 0x7ffffffffffffffc)"}, + {13, "R4_w=pkt(id=1,off=4,r=0,umin_value=2,umax_value=9223372036854775806,var_off=(0x2; 0x7ffffffffffffffc)"}, /* NET_IP_ALIGN + (4n+2) == (4n), alignment is fine. * We checked the bounds, but it might have been able * to overflow if the packet pointer started in the @@ -467,7 +467,7 @@ static struct bpf_align_test tests[] = { * So we did not get a 'range' on R6, and the access * attempt will fail. */ - {15, "R6_w=pkt(id=1,off=0,r=0,umin_value=2,umax_value=9223372034707292158,var_off=(0x2; 0x7fffffff7ffffffc)"}, + {15, "R6_w=pkt(id=1,off=0,r=0,umin_value=2,umax_value=9223372036854775806,var_off=(0x2; 0x7ffffffffffffffc)"}, } }, { -- 2.27.0

4 years

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[PATCH AUTOSEL 5.9 11/15] selftests/bpf: Fix array access with signed variable test

by Sasha Levin

From: Jean-Philippe Brucker <jean-philippe(a)linaro.org> [ Upstream commit 77ce220c0549dcc3db8226c61c60e83fc59dfafc ] The test fails because of a recent fix to the verifier, even though this program is valid. In details what happens is: 7: (61) r1 = *(u32 *)(r0 +0) Load a 32-bit value, with signed bounds [S32_MIN, S32_MAX]. The bounds of the 64-bit value are [0, U32_MAX]... 8: (65) if r1 s> 0xffffffff goto pc+1 ... therefore this is always true (the operand is sign-extended). 10: (b4) w2 = 11 11: (6d) if r2 s> r1 goto pc+1 When true, the 64-bit bounds become [0, 10]. The 32-bit bounds are still [S32_MIN, 10]. 13: (64) w1 <<= 2 Because this is a 32-bit operation, the verifier propagates the new 32-bit bounds to the 64-bit ones, and the knowledge gained from insn 11 is lost. 14: (0f) r0 += r1 15: (7a) *(u64 *)(r0 +0) = 4 Then the verifier considers r0 unbounded here, rejecting the test. To make the test work, change insn 8 to check the sign of the 32-bit value. Signed-off-by: Jean-Philippe Brucker <jean-philippe(a)linaro.org> Acked-by: John Fastabend <john.fastabend(a)gmail.com> Signed-off-by: Alexei Starovoitov <ast(a)kernel.org> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- tools/testing/selftests/bpf/verifier/array_access.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/verifier/array_access.c b/tools/testing/selftests/bpf/verifier/array_access.c index 1c4b1939f5a8d..bed53b561e044 100644 --- a/tools/testing/selftests/bpf/verifier/array_access.c +++ b/tools/testing/selftests/bpf/verifier/array_access.c @@ -68,7 +68,7 @@ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem), BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 9), BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, 0), - BPF_JMP_IMM(BPF_JSGT, BPF_REG_1, 0xffffffff, 1), + BPF_JMP32_IMM(BPF_JSGT, BPF_REG_1, 0xffffffff, 1), BPF_MOV32_IMM(BPF_REG_1, 0), BPF_MOV32_IMM(BPF_REG_2, MAX_ENTRIES), BPF_JMP_REG(BPF_JSGT, BPF_REG_2, BPF_REG_1, 1), -- 2.27.0

4 years

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Re: kernel BUG at drivers/dma-buf/dma-buf.c:LINE!

by syzbot

syzbot suspects this issue was fixed by commit: commit e722a295cf493388dae474745d30e91e1a2ec549 Author: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Date: Thu Aug 27 12:36:27 2020 +0000 staging: ion: remove from the tree bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17d4f137500000 start commit: abb3438d Merge tag 'm68knommu-for-v5.9-rc3' of git://git.k.. git tree: upstream kernel config: https://syzkaller.appspot.com/x/.config?x=978db74cb30aa994 dashboard link: https://syzkaller.appspot.com/bug?extid=d6734079f30f7fc39021 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17428596900000 If the result looks correct, please mark the issue as fixed by replying with: #syz fix: staging: ion: remove from the tree For information about bisection process see: https://goo.gl/tpsmEJ#bisection

4 years

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[PATCH][next] selftests/bpf: fix spelling mistake "tranmission" -> "transmission"

by Colin King

From: Colin Ian King <colin.king(a)canonical.com> There are two spelling mistakes in output messages. Fix these. Signed-off-by: Colin Ian King <colin.king(a)canonical.com> --- tools/testing/selftests/bpf/xdpxceiver.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/bpf/xdpxceiver.c b/tools/testing/selftests/bpf/xdpxceiver.c index 014dedaa4dd2..1e722ee76b1f 100644 --- a/tools/testing/selftests/bpf/xdpxceiver.c +++ b/tools/testing/selftests/bpf/xdpxceiver.c @@ -715,7 +715,7 @@ static void worker_pkt_dump(void) int payload = *((uint32_t *)(pkt_buf[iter]->payload + PKT_HDR_SIZE)); if (payload == EOT) { - ksft_print_msg("End-of-tranmission frame received\n"); + ksft_print_msg("End-of-transmission frame received\n"); fprintf(stdout, "---------------------------------------\n"); break; } @@ -747,7 +747,7 @@ static void worker_pkt_validate(void) } if (payloadseqnum == EOT) { - ksft_print_msg("End-of-tranmission frame received: PASS\n"); + ksft_print_msg("End-of-transmission frame received: PASS\n"); sigvar = 1; break; } -- 2.29.2

4 years

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Linux-kselftest-mirror December 2020