From: Dmitry Antipov dmantipov@yandex.ru
stable inclusion from stable-v6.6.3 commit e310aff779eb71f27ae9716ce73a041e86cc4368 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8LBQP
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit cb4c132ebfeac5962f7258ffc831caa0c4dada1a ]
When compiling with clang 16.0.6 and CONFIG_FORTIFY_SOURCE=y, I've noticed the following (somewhat confusing due to absence of an actual source code location):
In file included from drivers/net/wireless/ath/ath10k/debug.c:8: In file included from ./include/linux/module.h:13: In file included from ./include/linux/stat.h:19: In file included from ./include/linux/time.h:60: In file included from ./include/linux/time32.h:13: In file included from ./include/linux/timex.h:67: In file included from ./arch/x86/include/asm/timex.h:5: In file included from ./arch/x86/include/asm/processor.h:23: In file included from ./arch/x86/include/asm/msr.h:11: In file included from ./arch/x86/include/asm/cpumask.h:5: In file included from ./include/linux/cpumask.h:12: In file included from ./include/linux/bitmap.h:11: In file included from ./include/linux/string.h:254: ./include/linux/fortify-string.h:592:4: warning: call to '__read_overflow2_field' declared with 'warning' attribute: detected read beyond size of field (2nd parameter); maybe use struct_group()? [-Wattribute-warning] __read_overflow2_field(q_size_field, size);
The compiler actually complains on 'ath10k_debug_get_et_strings()' where fortification logic inteprets call to 'memcpy()' as an attempt to copy the whole 'ath10k_gstrings_stats' array from it's first member and so issues an overread warning. This warning may be silenced by passing an address of the whole array and not the first member to 'memcpy()'.
Signed-off-by: Dmitry Antipov dmantipov@yandex.ru Acked-by: Jeff Johnson quic_jjohnson@quicinc.com Signed-off-by: Kalle Valo quic_kvalo@quicinc.com Link: https://lore.kernel.org/r/20230829093652.234537-1-dmantipov@yandex.ru Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/net/wireless/ath/ath10k/debug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/wireless/ath/ath10k/debug.c b/drivers/net/wireless/ath/ath10k/debug.c index f9518e1c9903..fe89bc61e531 100644 --- a/drivers/net/wireless/ath/ath10k/debug.c +++ b/drivers/net/wireless/ath/ath10k/debug.c @@ -1140,7 +1140,7 @@ void ath10k_debug_get_et_strings(struct ieee80211_hw *hw, u32 sset, u8 *data) { if (sset == ETH_SS_STATS) - memcpy(data, *ath10k_gstrings_stats, + memcpy(data, ath10k_gstrings_stats, sizeof(ath10k_gstrings_stats)); }