Re: [libvirt] [PATCH] tests: Add getuid() to virnetdevbandwidthmock
On Mon, Jul 08, 2019 at 06:03:10PM +0200, Andrea Bolognani wrote:
When only geteuid() is mocked, the test crashes on Debian 10.
Fatal: failed to reset uid: No such file or directory
Program received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
50 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) t a a bt
Thread 1 (Thread 0x7ffff3b3e080 (LWP 12003)):
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1 0x00007ffff7798535 in __GI_abort () at abort.c:79
#2 0x00007ffff485ca20 in _gcry_logv (level=level@entry=40,
fmt=fmt@entry=0x7ffff4929126 "failed to reset uid: %s\n",
arg_ptr=arg_ptr@entry=0x7fffffffe4a0) at ../../src/misc.c:142
#3 0x00007ffff485cd61 in _gcry_log_fatal (fmt=fmt@entry=0x7ffff4929126 "failed to
reset uid: %s\n") at ../../src/misc.c:218
#4 0x00007ffff48639d1 in lock_pool_pages (n=<optimized out>, p=<optimized
out>) at ../../src/secmem.c:340
#5 _gcry_secmem_init_internal (n=<optimized out>) at ../../src/secmem.c:563
#6 0x00007ffff4863d78 in _gcry_secmem_init (n=4096) at ../../src/secmem.c:581
#7 0x00007ffff485e4e6 in _gcry_vcontrol (cmd=<optimized out>,
arg_ptr=arg_ptr@entry=0x7fffffffe5e0) at ../../src/global.c:506
#8 0x00007ffff485a789 in gcry_control (cmd=cmd@entry=GCRYCTL_INIT_SECMEM) at
../../src/visibility.c:79
#9 0x00007ffff71af10f in ssh_crypto_init () at ./src/libgcrypt.c:621
#10 0x00007ffff7193796 in _ssh_init (constructor=constructor@entry=1) at
./src/init.c:79
#11 0x00007ffff71834de in libssh_constructor () at ./src/init.c:116
Ewww, so its crashing in a ELF library constructor for libssh, which
is in turn calling into libgcrypt.
Obviously nothing todo with the test cases we're actually running.
I guess we're confusing the code into thinking it has some wierd
privilege by having geteuid() return 0, while getuid() returns
the normal UID.
Mocking getuid() is ok, but I fear its just a targetting one
specific problem we happen to be hitting today.
So I think we probably ought to make geteuid() delegate the
real getuid() function instead. Have a global flag we can set
& unset just before & after executing the real test code. That
way libraries will see correct UID info in general.
#12 0x00007ffff7fe437a in call_init (l=<optimized out>,
argc=argc@entry=1, argv=argv@entry=0x7fffffffe778, env=env@entry=0x7fffffffe788) at
dl-init.c:72
#13 0x00007ffff7fe4476 in call_init (env=0x7fffffffe788, argv=0x7fffffffe778, argc=1,
l=<optimized out>) at dl-init.c:30
#14 _dl_init (main_map=0x7ffff7ffe190, argc=1, argv=0x7fffffffe778, env=0x7fffffffe788)
at dl-init.c:119
#15 0x00007ffff7fd60ca in _dl_start_user () from /lib64/ld-linux-x86-64.so.2
#16 0x0000000000000001 in ?? ()
#17 0x00007fffffffea26 in ?? ()
#18 0x0000000000000000 in ?? ()
Signed-off-by: Andrea Bolognani <abologna(a)redhat.com>
---
tests/virnetdevbandwidthmock.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/tests/virnetdevbandwidthmock.c b/tests/virnetdevbandwidthmock.c
index cb48933447..f0c6b22c5f 100644
--- a/tests/virnetdevbandwidthmock.c
+++ b/tests/virnetdevbandwidthmock.c
@@ -24,3 +24,8 @@ uid_t geteuid(void)
{
return 0;
}
+
+uid_t getuid(void)
+{
+ return 0;
+}
--
2.21.0
--
libvir-list mailing list
libvir-list(a)redhat.com
https://www.redhat.com/mailman/listinfo/libvir-list
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|