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zdtm/vdso02: unmap vvar_vclock mappings

Browse Source 
It is a part of vvar and this test intends to unmap vdso and all vvar
mappings.

Fixes #2622

Signed-off-by: Andrei Vagin <avagin@google.com>
This commit is contained in:
Andrei Vagin 2025-03-16 22:23:14 +00:00 committed by Radostin Stoyanov
parent 12bb0de6f9
commit 327685c2a5
1 changed files with 24 additions and 7 deletions
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31
test/zdtm/static/vdso02.c
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@ -29,7 +29,8 @@ static int parse_vm_area(char *buf, struct vm_area *vma)
return -1;
}
static int find_blobs(pid_t pid, struct vm_area *vdso, struct vm_area *vvar)
static int find_blobs(pid_t pid, struct vm_area *vdso,
struct vm_area *vvar, struct vm_area *vvar_vclock)
{
char buf[BUF_SZ];
int ret = -1;
@ -39,6 +40,8 @@ static int find_blobs(pid_t pid, struct vm_area *vdso, struct vm_area *vvar)
vdso->end = VDSO_BAD_ADDR;
vvar->start = VVAR_BAD_ADDR;
vvar->end = VVAR_BAD_ADDR;
vvar_vclock->start = VVAR_BAD_ADDR;
vvar_vclock->end = VVAR_BAD_ADDR;
if (snprintf(buf, BUF_SZ, "/proc/%d/maps", pid) < 0) {
pr_perror("snprintf() failure for path");
@ -57,12 +60,18 @@ static int find_blobs(pid_t pid, struct vm_area *vdso, struct vm_area *vvar)
if (strstr(buf, "[vvar]") && parse_vm_area(buf, vvar))
goto err;
if (strstr(buf, "[vvar_vclock]") &&
parse_vm_area(buf, vvar_vclock))
goto err;
}
if (vdso->start != VDSO_BAD_ADDR)
test_msg("[vdso] %lx-%lx\n", vdso->start, vdso->end);
if (vvar->start != VVAR_BAD_ADDR)
test_msg("[vvar] %lx-%lx\n", vvar->start, vvar->end);
if (vvar_vclock->start != VVAR_BAD_ADDR)
test_msg("[vvar_vclock] %lx-%lx\n",
vvar_vclock->start, vvar_vclock->end);
ret = 0;
err:
fclose(maps);
@ -143,10 +152,10 @@ void sys_exit(int status)
static int unmap_blobs(void)
{
struct vm_area vdso, vvar;
struct vm_area vdso, vvar, vvar_vclock;
int ret;
if (find_blobs(getpid(), &vdso, &vvar))
if (find_blobs(getpid(), &vdso, &vvar, &vvar_vclock))
return -1;
if (vdso.start != VDSO_BAD_ADDR) {
@ -159,13 +168,19 @@ static int unmap_blobs(void)
if (ret)
return ret;
}
if (vvar_vclock.start != VVAR_BAD_ADDR) {
ret = sys_munmap((void *)vvar_vclock.start,
vvar_vclock.end - vvar_vclock.start);
if (ret)
return ret;
}
return 0;
}
int main(int argc, char *argv[])
{
struct vm_area vdso, vvar;
struct vm_area vdso, vvar, vvar_vclock;
pid_t child;
int status, ret = -1;
@ -201,9 +216,11 @@ int main(int argc, char *argv[])
goto out_kill;
}
if (find_blobs(child, &vdso, &vvar))
if (find_blobs(child, &vdso, &vvar, &vvar_vclock))
goto out_kill;
if (vdso.start != VDSO_BAD_ADDR || vvar.start != VVAR_BAD_ADDR) {
if (vdso.start != VDSO_BAD_ADDR ||
vvar.start != VVAR_BAD_ADDR ||
vvar_vclock.start != VVAR_BAD_ADDR) {
pr_err("Found vvar or vdso blob(s) in child, which should have unmapped them\n");
goto out_kill;
}
@ -211,7 +228,7 @@ int main(int argc, char *argv[])
test_daemon();
test_waitsig();
if (find_blobs(child, &vdso, &vvar))
if (find_blobs(child, &vdso, &vvar, &vvar_vclock))
goto out_kill;
if (vdso.start != VDSO_BAD_ADDR || vvar.start != VVAR_BAD_ADDR) {
pr_err("Child without vdso got it after C/R\n");