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Diffstat (limited to 'results/classifier/zero-shot-user-mode/output/instruction/2825')
| -rw-r--r-- | results/classifier/zero-shot-user-mode/output/instruction/2825 | 43 |
1 files changed, 0 insertions, 43 deletions
diff --git a/results/classifier/zero-shot-user-mode/output/instruction/2825 b/results/classifier/zero-shot-user-mode/output/instruction/2825 deleted file mode 100644 index cd9ba3ad..00000000 --- a/results/classifier/zero-shot-user-mode/output/instruction/2825 +++ /dev/null @@ -1,43 +0,0 @@ -instruction: 0.609 -runtime: 0.267 -syscall: 0.125 - - - -execveat with file descriptor and empty filename returns ENOENT when cross architectures -Description of problem: -On my x86_64 debian host (with binfmt_misc configured), when calling execveat with a fd , and empty pathname "", and flag AT_EMPTY_PATH. Then only x86_64 and x86 can be called normally, while programs of other architectures (arm64, arm, riscv64, etc.) will return ENOENT errors. - -I first encountered this problem when trying to run lxc-attach with qemu-aarch64. Its reference is [lxc/stable-6.0/src/include/fexecve.c#L30](https://github.com/lxc/lxc/blob/stable-6.0/src/include/fexecve.c#L30), which is the implementation of the fexecve function. So I wrote a simple test and compiled it with `x86_64/aarch64-linux-gnu-gcc -static test.c -o test`. execveat works fine when running natively or using qemu-x86_64/qemu-i386. When running versions for other architectures, using AT_EMPTY_PATH will result in ENOENT (No such file or directory); use /proc/self/fd/%d as the pathname and execve, it will work fine (like the rest part of the fexecve function). If binfmt_misc is turned off and run forign architectures ver, both calls will result in ENOEXEC (Exec format error). -Steps to reproduce: -1. Install qemu-user and binfmt_misc. Install gcc-aarch64-linux-gnu/gcc-riscv64-linux-gnu etc. -2. Compile test.c with host gcc, then compile forign architectures ver with gcc-aarch64-linux-gnu/gcc-riscv64-linux-gnu etc. like `gcc -static test.c -o test` and `aarch64-linux-gnu-gcc -static test.c -o test-aarch64` -3. Run different versions of test -4. To disable/enable binfmt, you can `echo 0 > /proc/sys/fs/binfmt_misc/qemu-aarch64` or `echo 1 > /proc/sys/fs/binfmt_misc/qemu-aarch64` -5. Sample outputs - -``` -rrex@debian:~/Downloads$ ./test -****Running to prepare execve -fd=3 -File size: 772296 bytes - -execveat with AT_EMPTY_PATH: -**Running in execve - -execveat with fd path: /proc/self/fd/3 -**Running in execve - -rrex@debian:~/Downloads$ qemu-aarch64 ./test-aarch64 -****Running to prepare execve -fd=3 -File size: 706104 bytes - -execveat with AT_EMPTY_PATH: -!!execveat a fd failed with errno: No such file or directory - -execveat with fd path: /proc/self/fd/3 -**Running in execve -``` -Additional information: -# |