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authorChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:07 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:17 +0200
commit9260319e7411ff8281700a532caa436f40120ec4 (patch)
tree2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues/target_missing/host_missing/accel_missing/2825.toml
parent225caa38269323af1bfc2daadff5ec8bd930747f (diff)
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-id = 2825
-title = "execveat with file descriptor and empty filename returns ENOENT when cross architectures"
-state = "opened"
-created_at = "2025-02-21T13:01:36.698Z"
-closed_at = "n/a"
-labels = []
-url = "https://gitlab.com/qemu-project/qemu/-/issues/2825"
-host-os = "Debian 12"
-host-arch = "x86"
-qemu-version = "9.2.0"
-guest-os = "n/a"
-guest-arch = "n/a"
-description = """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)."""
-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 = """#"""