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virmock: Initialize both symbols in VIR_MOCK_REAL_INIT_ALT

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It may happen that both symbols are present. Especially when
chaining mocks. For instance if a test is using virpcimock and
then both stat and __xstat would be present in the address space
as virpcimock implements both. Then, if the test would try to use
say virfilewrapper (which again uses VIR_MOCK_REAL_INIT_ALT() to
init real_stat and real___xstat) it would find stat() from
virpcimock and stop there. The virfilewrapper.c:real___xstat
wouldn't be initialized and thus it may result in a segfault.

The reason for segfault is that sys/stat.h may redefine stat() to
call __xstat().

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Michal Privoznik 2019-02-26 10:12:05 +01:00
parent 27b6ca7d9c
commit d7e5baa5a1
1 changed files with 3 additions and 2 deletions
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5
tests/virmock.h
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@ -292,8 +292,9 @@
# define VIR_MOCK_REAL_INIT_ALT(name1, name2) \
do { \
if (!(real_ ## name1 = dlsym(RTLD_NEXT, #name1)) && \
!(real_ ## name2 = dlsym(RTLD_NEXT, #name2))) { \
real_ ## name1 = dlsym(RTLD_NEXT, #name1); \
real_ ## name2 = dlsym(RTLD_NEXT, #name2); \
if (!real_##name1 && !real_##name2) { \
fprintf(stderr, "Cannot find real '%s' or '%s' symbol\n", \
#name1, #name2); \
abort(); \