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| author | Peter Collingbourne <pcc@google.com> | 2025-04-02 17:06:59 -0700 |
|---|---|---|
| committer | Kees Cook <kees@kernel.org> | 2025-04-15 13:50:17 -0700 |
| commit | d94c12bd97d567de342fd32599e7cd9e50bfa140 (patch) | |
| tree | 292541f999cee604caaff21ef7e1a8045eb5e225 /tools/perf/scripts/python/stackcollapse.py | |
| parent | 8ffd015db85fea3e15a77027fda6c02ced4d2444 (diff) | |
| download | linux-d94c12bd97d567de342fd32599e7cd9e50bfa140.tar.gz linux-d94c12bd97d567de342fd32599e7cd9e50bfa140.tar.bz2 linux-d94c12bd97d567de342fd32599e7cd9e50bfa140.zip | |
string: Add load_unaligned_zeropad() code path to sized_strscpy()
The call to read_word_at_a_time() in sized_strscpy() is problematic
with MTE because it may trigger a tag check fault when reading
across a tag granule (16 bytes) boundary. To make this code
MTE compatible, let's start using load_unaligned_zeropad()
on architectures where it is available (i.e. architectures that
define CONFIG_DCACHE_WORD_ACCESS). Because load_unaligned_zeropad()
takes care of page boundaries as well as tag granule boundaries,
also disable the code preventing crossing page boundaries when using
load_unaligned_zeropad().
Signed-off-by: Peter Collingbourne <pcc@google.com>
Link: https://linux-review.googlesource.com/id/If4b22e43b5a4ca49726b4bf98ada827fdf755548
Fixes: 94ab5b61ee16 ("kasan, arm64: enable CONFIG_KASAN_HW_TAGS")
Cc: stable@vger.kernel.org
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20250403000703.2584581-2-pcc@google.com
Signed-off-by: Kees Cook <kees@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/stackcollapse.py')
0 files changed, 0 insertions, 0 deletions