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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-07-03 19:39:53 +0200 |
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| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-07-03 19:39:53 +0200 |
| commit | dee4dcba78baf712cab403d47d9db319ab7f95d6 (patch) | |
| tree | 418478faf06786701a56268672f73d6b0b4eb239 /results/classifier/semantic-bugs/2971 | |
| parent | 4d9e26c0333abd39bdbd039dcdb30ed429c475ba (diff) | |
| download | qemu-analysis-dee4dcba78baf712cab403d47d9db319ab7f95d6.tar.gz qemu-analysis-dee4dcba78baf712cab403d47d9db319ab7f95d6.zip | |
restructure results
Diffstat (limited to 'results/classifier/semantic-bugs/2971')
| -rw-r--r-- | results/classifier/semantic-bugs/2971 | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/results/classifier/semantic-bugs/2971 b/results/classifier/semantic-bugs/2971 new file mode 100644 index 000000000..2ee49f8b8 --- /dev/null +++ b/results/classifier/semantic-bugs/2971 @@ -0,0 +1,57 @@ +instruction: 0.834 +vnc: 0.780 +device: 0.770 +assembly: 0.671 +network: 0.667 +socket: 0.623 +graphic: 0.579 +semantic: 0.515 +boot: 0.473 +other: 0.425 +KVM: 0.396 +mistranslation: 0.282 + +loongarch64 crashes caused by lenient instruction decoding of vldi and xvldi +Description of problem: +Lenient instruction decoding of `vldi` and `xvldi` leads to Qemu crashes. + +The decoding of `vldi` and `xvldi` instruction allows for instructions with illegal immediates. + +`target/loongarch/insns.decode`: + +``` +vldi 0111 00111110 00 ............. ..... @v_i13 +xvldi 0111 01111110 00 ............. ..... @v_i13 +``` + +This is considered in `target/loongarch/tcg/insn_trans/trans_vec.c.inc`: + +```C + /* + * imm bit [11:8] is mode, mode value is 0-12. + * other values are invalid. + */ +``` + +However, an assertion error is raised when this condition is violated and qemu crashes: + +``` +** +ERROR:target/loongarch/insn_trans/trans_vec.c.inc:3574:vldi_get_value: code should not be reached +Bail out! ERROR:target/loongarch/insn_trans/trans_vec.c.inc:3574:vldi_get_value: code should not be reached +``` + +On hardware (Loongson 3A5000), these instructions cause a SIGILL. +Steps to reproduce: +1. compile the `test_inv_vldi` test program for loongarch64 (see additional information) +2. run `qemu-loongarch64-static ./test_inv_vldi` +Additional information: +I will post a patch for this issue to the mailing list soon. + +`test_inv_vldi` source code: + +```C +int main(int argc, char** argv) { + asm volatile(".4byte 0x73e3a000"); +} +``` |