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mount_ns_exec2: read /proc/self/exe before unsharing the mount namespace #4106

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mount_ns_exec2: read /proc/self/exe before unsharing the mount namespace #4106

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12 changes: 7 additions & 5 deletions src/test/mount_ns_exec2.c
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Original file line number Diff line number Diff line change
Expand Up @@ -16,16 +16,18 @@ int main(int argc, char* argv[]) {
return 0;
}

if (-1 == try_setup_ns(CLONE_NEWNS)) {
atomic_puts("EXIT-SUCCESS");
return 0;
}

// Read /proc/self/exe before unsharing: afterwards the kernel renders it from
// the old namespace's root, which differs from ours if we were chrooted.
char exe_buf[PATH_MAX+1];
memset(exe_buf, 0, sizeof(exe_buf));
ssize_t nread = readlink("/proc/self/exe", exe_buf, sizeof(exe_buf)-1);
test_assert(nread != -1);

if (-1 == try_setup_ns(CLONE_NEWNS)) {
atomic_puts("EXIT-SUCCESS");
return 0;
}

char *exe_name = strrchr(exe_buf, '/');
*exe_name = '\0';
exe_name += 1;
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