sys/linux: remove get_kernel_syms, add quotactl syscall

get_kernel_syms does not seem to be present upstream.
Describe an old quotactl syscall.
Also fix umount/umount2 names in kallsyms.

1 files changed, 13 insertions, 1 deletions

diff --git a/pkg/host/host_linux.go b/pkg/host/host_linux.go
index 6da153f2d..3c2a3156f 100644
--- a/pkg/host/host_linux.go
+++ b/pkg/host/host_linux.go
@@ -54,7 +54,19 @@ func isSupported(kallsyms []byte, c *prog.Syscall) bool {
 	if len(kallsyms) == 0 {
 		return true
 	}
-	return bytes.Index(kallsyms, []byte(" T sys_"+c.CallName+"\n")) != -1
+	name := c.CallName
+	if newname := kallsymsMap[name]; newname != "" {
+		name = newname
+	}
+	return bytes.Index(kallsyms, []byte(" T sys_"+name+"\n")) != -1
+}
+
+// Some syscall names diverge in __NR_* consts and kallsyms.
+// umount2 is renamed to umount in arch/x86/entry/syscalls/syscall_64.tbl.
+// Where umount is renamed to oldumount is unclear.
+var kallsymsMap = map[string]string{
+	"umount":  "oldumount",
+	"umount2": "umount",
 }
 
 func isSupportedSyzkall(c *prog.Syscall) bool {