Red Hat Bugzilla – Bug 1477776
torsocks disallows sched_getaffinity syscall
Last modified: 2018-05-29 10:46:30 EDT
Description of problem:
I discovered the issue while using youtube-dl through torsocks with ffmpeg installed from rpmfusion. While third party repositories are unsupported, it should not be ignored that torsocks is currently disallowing this syscall.
When ffmpeg is present on the system, youtube-dl uses it. Even when using -f best to download a single file, youtube-dl starts an ffmpeg process before it begins to download. ffmpeg inherits the syscall wrapping from torsocks. ffmpeg not being allowed to use this syscall is currently troublesome as it endlessly leaks memory until killed. A system with 16 GiB of swap is unusable for a significant amount of time once primary memory is full.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. run: sudo dnf install -y https://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm
2. run: sudo dnf install -y ffmpeg
3. observe effects of running: ffmpeg -hide_banner -nostdin -y -f lavfi -i anullsrc -t 1 -f s16le /dev/null
4. observe effects of running: torsocks ffmpeg -hide_banner -nostdin -y -f lavfi -i anullsrc -t 1 -f s16le /dev/null
[Aug 02 18:14:48] WARNING torsocks: [syscall] Unsupported syscall number 204. Denying the call (in tsocks_syscall() at syscall.c:465)
Memory usage rises at a constant rate.
Input #0, lavfi, from 'anullsrc':
Duration: N/A, start: 0.000000, bitrate: 705 kb/s
Stream #0:0: Audio: pcm_u8, 44100 Hz, stereo, u8, 705 kb/s
Stream #0:0 -> #0:0 (pcm_u8 (native) -> pcm_s16le (native))
Output #0, s16le, to '/dev/null':
encoder : Lavf57.71.100
Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
encoder : Lavc57.89.100 pcm_s16le
size= 172kB time=00:00:01.00 bitrate=1411.2kbits/s speed= 267x
video:0kB audio:172kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
[kmarek@youtube-dl-test ~]$ file "$(which ffmpeg)"
/usr/bin/ffmpeg: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=c1cb958a8e44766d5ac79ba345bdb47b86b13182, stripped
[kmarek@youtube-dl-test ~]$ ausyscall x86_64 --dump | grep '^204'
[kmarek@youtube-dl-test ~]$ grep '204$' /usr/include/asm/unistd_64.h
#define __NR_sched_getaffinity 204
Is it a bug for a program to not handle syscalls failing? (should they ever fail?)
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Fixed in Fedora 28: torsocks-2.2.0-1.fc28.x86_64
See upstream fix: https://gitweb.torproject.org/torsocks.git/commit/src/lib/syscall.c?id=e389c99937a35815e2752952634cc80c3aaf1d4e