platform: posix: Correct posix_fuzz_sz to size_t to prevent truncation

lrgirdwo · lrgirdwo · commit dd8486f9b2af · 2026-03-31T12:42:45.000+01:00
The fuzzer's payload size posix_fuzz_sz is provided by libFuzzer as
a size_t. Declaring it as a uint8_t in the ipc test harness resulted
in silent payload truncation (maximum 255 bytes) causing incomplete
corpus generation. This corrects the types between fuzz.c and ipc.c.

Signed-off-by: Liam Girdwood &lt;liam.r.girdwood@linux.intel.com&gt;
diff --git a/src/platform/posix/ipc.c b/src/platform/posix/ipc.c
@@ -24,7 +24,8 @@ static void posix_ipc_isr(void *arg)
 }
 
 // External symbols set up by the fuzzing layer
-extern uint8_t *posix_fuzz_buf, posix_fuzz_sz;
+extern const uint8_t *posix_fuzz_buf;
+extern size_t posix_fuzz_sz;
 
 // Lots of space.  Should really synchronize with the -max_len
 // parameter to libFuzzer (defaults to 4096), but that requires

Original file line number	Diff line number	Diff line change
`@@ -24,7 +24,8 @@ static void posix_ipc_isr(void *arg)`
`24`	`24`	`}`
`25`	`25`
`26`	`26`	`// External symbols set up by the fuzzing layer`
`27`		`-extern uint8_t *posix_fuzz_buf, posix_fuzz_sz;`
	`27`	`+extern const uint8_t *posix_fuzz_buf;`
	`28`	`+extern size_t posix_fuzz_sz;`
`28`	`29`
`29`	`30`	`// Lots of space. Should really synchronize with the -max_len`
`30`	`31`	`// parameter to libFuzzer (defaults to 4096), but that requires`