Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

No conflicts.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 42 insertions, 23 deletions

diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index bb2f95d7175c..01ebabbbe8c9 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -76,9 +76,11 @@ const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
 /* Fetch type information table */
 static const struct fetch_type probe_fetch_types[] = {
 	/* Special types */
-	__ASSIGN_FETCH_TYPE("string", string, string, sizeof(u32), 1,
+	__ASSIGN_FETCH_TYPE("string", string, string, sizeof(u32), 1, 1,
 			    "__data_loc char[]"),
-	__ASSIGN_FETCH_TYPE("ustring", string, string, sizeof(u32), 1,
+	__ASSIGN_FETCH_TYPE("ustring", string, string, sizeof(u32), 1, 1,
+			    "__data_loc char[]"),
+	__ASSIGN_FETCH_TYPE("symstr", string, string, sizeof(u32), 1, 1,
 			    "__data_loc char[]"),
 	/* Basic types */
 	ASSIGN_FETCH_TYPE(u8,  u8,  0),
@@ -98,10 +100,15 @@ static const struct fetch_type probe_fetch_types[] = {
 	ASSIGN_FETCH_TYPE_END
 };
 
-static const struct fetch_type *find_fetch_type(const char *type)
+static const struct fetch_type *find_fetch_type(const char *type, unsigned long flags)
 {
 	int i;
 
+	/* Reject the symbol/symstr for uprobes */
+	if (type && (flags & TPARG_FL_USER) &&
+	    (!strcmp(type, "symbol") || !strcmp(type, "symstr")))
+		return NULL;
+
 	if (!type)
 		type = DEFAULT_FETCH_TYPE_STR;
 
@@ -119,13 +126,13 @@ static const struct fetch_type *find_fetch_type(const char *type)
 
 		switch (bs) {
 		case 8:
-			return find_fetch_type("u8");
+			return find_fetch_type("u8", flags);
 		case 16:
-			return find_fetch_type("u16");
+			return find_fetch_type("u16", flags);
 		case 32:
-			return find_fetch_type("u32");
+			return find_fetch_type("u32", flags);
 		case 64:
-			return find_fetch_type("u64");
+			return find_fetch_type("u64", flags);
 		default:
 			goto fail;
 		}
@@ -478,7 +485,7 @@ parse_probe_arg(char *arg, const struct fetch_type *type,
 					    DEREF_OPEN_BRACE);
 			return -EINVAL;
 		} else {
-			const struct fetch_type *t2 = find_fetch_type(NULL);
+			const struct fetch_type *t2 = find_fetch_type(NULL, flags);
 
 			*tmp = '\0';
 			ret = parse_probe_arg(arg, t2, &code, end, flags, offs);
@@ -630,9 +637,9 @@ static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size,
 		/* The type of $comm must be "string", and not an array. */
 		if (parg->count || (t && strcmp(t, "string")))
 			goto out;
-		parg->type = find_fetch_type("string");
+		parg->type = find_fetch_type("string", flags);
 	} else
-		parg->type = find_fetch_type(t);
+		parg->type = find_fetch_type(t, flags);
 	if (!parg->type) {
 		trace_probe_log_err(offset + (t ? (t - arg) : 0), BAD_TYPE);
 		goto out;
@@ -662,16 +669,26 @@ static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size,
 
 	ret = -EINVAL;
 	/* Store operation */
-	if (!strcmp(parg->type->name, "string") ||
-	    !strcmp(parg->type->name, "ustring")) {
-		if (code->op != FETCH_OP_DEREF && code->op != FETCH_OP_UDEREF &&
-		    code->op != FETCH_OP_IMM && code->op != FETCH_OP_COMM &&
-		    code->op != FETCH_OP_DATA && code->op != FETCH_OP_TP_ARG) {
-			trace_probe_log_err(offset + (t ? (t - arg) : 0),
-					    BAD_STRING);
-			goto fail;
+	if (parg->type->is_string) {
+		if (!strcmp(parg->type->name, "symstr")) {
+			if (code->op != FETCH_OP_REG && code->op != FETCH_OP_STACK &&
+			    code->op != FETCH_OP_RETVAL && code->op != FETCH_OP_ARG &&
+			    code->op != FETCH_OP_DEREF && code->op != FETCH_OP_TP_ARG) {
+				trace_probe_log_err(offset + (t ? (t - arg) : 0),
+						    BAD_SYMSTRING);
+				goto fail;
+			}
+		} else {
+			if (code->op != FETCH_OP_DEREF && code->op != FETCH_OP_UDEREF &&
+			    code->op != FETCH_OP_IMM && code->op != FETCH_OP_COMM &&
+			    code->op != FETCH_OP_DATA && code->op != FETCH_OP_TP_ARG) {
+				trace_probe_log_err(offset + (t ? (t - arg) : 0),
+						    BAD_STRING);
+				goto fail;
+			}
 		}
-		if ((code->op == FETCH_OP_IMM || code->op == FETCH_OP_COMM ||
+		if (!strcmp(parg->type->name, "symstr") ||
+		    (code->op == FETCH_OP_IMM || code->op == FETCH_OP_COMM ||
 		     code->op == FETCH_OP_DATA) || code->op == FETCH_OP_TP_ARG ||
 		     parg->count) {
 			/*
@@ -679,6 +696,8 @@ static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size,
 			 * must be kept, and if parg->count != 0, this is an
 			 * array of string pointers instead of string address
 			 * itself.
+			 * For the symstr, it doesn't need to dereference, thus
+			 * it just get the value.
 			 */
 			code++;
 			if (code->op != FETCH_OP_NOP) {
@@ -690,6 +709,8 @@ static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size,
 		if (!strcmp(parg->type->name, "ustring") ||
 		    code->op == FETCH_OP_UDEREF)
 			code->op = FETCH_OP_ST_USTRING;
+		else if (!strcmp(parg->type->name, "symstr"))
+			code->op = FETCH_OP_ST_SYMSTR;
 		else
 			code->op = FETCH_OP_ST_STRING;
 		code->size = parg->type->size;
@@ -919,8 +940,7 @@ static int __set_print_fmt(struct trace_probe *tp, char *buf, int len,
 	for (i = 0; i < tp->nr_args; i++) {
 		parg = tp->args + i;
 		if (parg->count) {
-			if ((strcmp(parg->type->name, "string") == 0) ||
-			    (strcmp(parg->type->name, "ustring") == 0))
+			if (parg->type->is_string)
 				fmt = ", __get_str(%s[%d])";
 			else
 				fmt = ", REC->%s[%d]";
@@ -928,8 +948,7 @@ static int __set_print_fmt(struct trace_probe *tp, char *buf, int len,
 				pos += snprintf(buf + pos, LEN_OR_ZERO,
 						fmt, parg->name, j);
 		} else {
-			if ((strcmp(parg->type->name, "string") == 0) ||
-			    (strcmp(parg->type->name, "ustring") == 0))
+			if (parg->type->is_string)
 				fmt = ", __get_str(%s)";
 			else
 				fmt = ", REC->%s";