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drm/i915: refactor deprecated strncpy

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`strncpy` is deprecated for use on NUL-terminated destination strings [1].

We should prefer more robust and less ambiguous string interfaces.

A suitable replacement is `strscpy` [2] due to the fact that it
guarantees NUL-termination on the destination buffer without
unnecessarily NUL-padding. `ctx` is zero allocated and as such strncpy's
NUL-padding behavior was strictly a performance hit which is now
resolved.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Justin Stitt 2023-09-19 04:45:31 +00:00 committed by Rodrigo Vivi
parent afddcbe41f
commit 5642639bd4
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/gem/selftests/mock_context.c
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@ -36,7 +36,7 @@ mock_context(struct drm_i915_private *i915,
if (name) { if (name) {
struct i915_ppgtt *ppgtt; struct i915_ppgtt *ppgtt;
strncpy(ctx->name, name, sizeof(ctx->name) - 1); strscpy(ctx->name, name, sizeof(ctx->name));
ppgtt = mock_ppgtt(i915, name); ppgtt = mock_ppgtt(i915, name);
if (!ppgtt) if (!ppgtt)