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seccomp: Get actual errno value from failed seccomp functions

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Upon failure, a libseccomp API returns actual errno value very
rarely. Fortunately, after its commit 34bf78ab (contained in
2.5.0 release), the SCMP_FLTATR_API_SYSRAWRC attribute can be set
which makes subsequent APIs return true errno on failure.

This is especially critical when seccomp_load() fails, because
generic -ECANCELED says nothing.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Michal Privoznik 2022-10-26 09:30:24 +02:00 • committed by Daniel P. Berrangé
parent 23f77f05f2
commit 73422d9524
2 changed files with 22 additions and 0 deletions
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13
softmmu/qemu-seccomp.c
View file

@ -312,6 +312,19 @@ static int seccomp_start(uint32_t seccomp_opts, Error **errp)
goto seccomp_return;
}
#if defined(CONFIG_SECCOMP_SYSRAWRC)
/*
* This must be the first seccomp_attr_set() call to have full
* error propagation from subsequent seccomp APIs.
*/
rc = seccomp_attr_set(ctx, SCMP_FLTATR_API_SYSRAWRC, 1);
if (rc != 0) {
error_setg_errno(errp, -rc,
"failed to set seccomp rawrc attribute");
goto seccomp_return;
}
#endif
rc = seccomp_attr_set(ctx, SCMP_FLTATR_CTL_TSYNC, 1);
if (rc != 0) {
error_setg_errno(errp, -rc,