[igt-dev] [PATCH i-g-t] i915/gem_caching: Fix mmap protection for writes

[Chris Wilson]

As we are about to write into the mmap'ed pointer using memset, we need
to specify PROT_WRITE [if we only say PROT_READ, then the memset should
generate a SIGSEGV].

Fixes: 897d21d14e99 ("i915/gem_caching: Remove libdrm dependency")
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Ramalingam C <ramalingam.c at intel.com>
Cc: Dominik Grzegorzek <dominik.grzegorzek at intel.com>
---
 tests/i915/gem_caching.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/i915/gem_caching.c b/tests/i915/gem_caching.c
index 1d8989db7..894c4b12e 100644
--- a/tests/i915/gem_caching.c
+++ b/tests/i915/gem_caching.c
@@ -282,7 +282,7 @@ igt_main
 			val2 = i + 63;
 			cpu_ptr = gem_mmap__cpu(data.fd, scratch_buf->handle,
 						0, scratch_buf->surface[0].size,
-						PROT_READ);
+						PROT_WRITE);
 
 			memset(cpu_ptr + start, val2, len);
 
-- 
2.28.0