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restorer: add logging on prctl PR_SET_MM_MAP failure

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This kernel feature contained some bugs initially. Those logs are useful in identifing what the
underlaying issue is and which kernel patch to backport.

Signed-off-by: Michal Clapinski <mclapinski@google.com>
This commit is contained in:
Michal Clapinski 2023-01-17 17:59:53 +01:00 • committed by Andrei Vagin
parent fb66727a25
commit 0bddecead0
1 changed files with 18 additions and 0 deletions
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18
criu/pie/restorer.c
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@ -1813,6 +1813,24 @@ long __export_restore_task(struct task_restore_args *args)
.exe_fd = args->fd_exe_link,
};
ret = sys_prctl(PR_SET_MM, PR_SET_MM_MAP, (long)&prctl_map, sizeof(prctl_map), 0);
if (ret) {
pr_debug("prctl PR_SET_MM_MAP failed with %d\n", (int)ret);
pr_debug(" .start_code = %" PRIx64 "\n", prctl_map.start_code);
pr_debug(" .end_code = %" PRIx64 "\n", prctl_map.end_code);
pr_debug(" .start_data = %" PRIx64 "\n", prctl_map.start_data);
pr_debug(" .end_data = %" PRIx64 "\n", prctl_map.end_data);
pr_debug(" .start_stack = %" PRIx64 "\n", prctl_map.start_stack);
pr_debug(" .start_brk = %" PRIx64 "\n", prctl_map.start_brk);
pr_debug(" .brk = %" PRIx64 "\n", prctl_map.brk);
pr_debug(" .arg_start = %" PRIx64 "\n", prctl_map.arg_start);
pr_debug(" .arg_end = %" PRIx64 "\n", prctl_map.arg_end);
pr_debug(" .env_start = %" PRIx64 "\n", prctl_map.env_start);
pr_debug(" .env_end = %" PRIx64 "\n", prctl_map.env_end);
pr_debug(" .auxv_size = %" PRIu32 "\n", prctl_map.auxv_size);
for (i = 0; i < prctl_map.auxv_size / sizeof(uint64_t); i++)
pr_debug(" .auxv[%d] = %" PRIx64 "\n", i, prctl_map.auxv[i]);
pr_debug(" .exe_fd = %" PRIu32 "\n", prctl_map.exe_fd);
}
if (ret == -EINVAL) {
ret = sys_prctl_safe(PR_SET_MM, PR_SET_MM_START_CODE, (long)args->mm.mm_start_code, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_END_CODE, (long)args->mm.mm_end_code, 0);