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Diffstat (limited to '')
| -rw-r--r-- | results/classifier/gemma3:27b/runtime/1102 | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/results/classifier/gemma3:27b/runtime/1102 b/results/classifier/gemma3:27b/runtime/1102 new file mode 100644 index 00000000..7399874b --- /dev/null +++ b/results/classifier/gemma3:27b/runtime/1102 @@ -0,0 +1,41 @@ + + + +qemu-user: zero_bss might raise segfault when segment is not writable +Description of problem: +When a PT_LOAD segment with the following attributes presented in the user program, +* MemSiz > FileSiz +* NOT Writable + +qemu-aarch64 will crash with segment fault running it. + + + + +in [linux-user/elfload.c: bss_zero](https://gitlab.com/qemu-project/qemu/-/blob/master/linux-user/elfload.c#L2097), the exceeded part is zero'ed without checking if it is writable +``` + if (host_start < host_map_start) { + memset((void *)host_start, 0, host_map_start - host_start); + } +``` +Steps to reproduce: +1. ./qemu-aarch64 ./X.so +Additional information: +readelf output of X.so +``` +Program Headers: + Type Offset VirtAddr PhysAddr FileSiz MemSiz Flags Align + PHDR 0x0000000000000040 0x0000000000000040 0x0000000000000040 0x0000000000000230 0x0000000000000230 R E 0x8 + LOAD 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000110270 0x00000000001c94e0 R E 0x10000 + LOAD 0x0000000000129bd0 0x00000000001d9bd0 0x00000000001d9bd0 0x0000000000000438 0x00000000000004c0 RW 0x10000 + LOAD 0x000000000013a008 0x00000000001ea008 0x00000000001ea008 0x0000000000017bd0 0x0000000000017bd0 RW 0x10000 + LOAD 0x0000000000161bd8 0x0000000000211bd8 0x0000000000211bd8 0x000000000000f740 0x000000000000f740 RW 0x10000 + DYNAMIC 0x0000000000161e60 0x0000000000211e60 0x0000000000211e60 0x00000000000001e0 0x00000000000001e0 RW 0x8 + INTERP 0x0000000000089410 0x0000000000089410 0x0000000000089410 0x0000000000000015 0x0000000000000015 R 0x1 + [Requesting program interpreter: /system/bin/linker64] + NOTE 0x000000000013dbc8 0x00000000001edbc8 0x00000000001edbc8 0x0000000000000011 0x0000000000000011 R 0x1 + GNU_EH_FRAME 0x00000000001c86a4 0x00000000001c86a4 0x00000000001c86a4 0x00000000000002dc 0x00000000000002dc R 0x4 + GNU_STACK 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 RW 0x10 +``` + +X.so: https://drive.google.com/file/d/1A7mkWRcK2BKkpeevt8T6FVLg-t6mWdgi/view?usp=sharing |