Messages in this thread | | | Date | Tue, 20 Sep 2022 08:02:42 +0800 | From | kernel test robot <> | Subject | [linux-stable-rc:linux-5.15.y 6634/9999] huge_count_read_write.c:23:9: warning: 'write' reading 4294967295 bytes from a region of size 1 |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.15.y head: d766f744e4827dc41ef6c01403a96b7bb3938132 commit: 9ea7148f61cd225959bbacc0b075db72169c8b59 [6634/9999] selftests/damon: add damon to selftests root Makefile compiler: gcc-11 (Debian 11.3.0-5) 11.3.0 reproduce: # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=9ea7148f61cd225959bbacc0b075db72169c8b59 git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-5.15.y git checkout 9ea7148f61cd225959bbacc0b075db72169c8b59 make O=/tmp/kselftest headers make O=/tmp/kselftest -C tools/testing/selftests
If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
huge_count_read_write.c: In function 'write_read_with_huge_count': >> huge_count_read_write.c:23:9: warning: 'write' reading 4294967295 bytes from a region of size 1 [-Wstringop-overread] 23 | write(filedesc, "", 0xfffffffful); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from huge_count_read_write.c:8: /usr/include/unistd.h:367:16: note: in a call to function 'write' declared with attribute 'access (read_only, 2, 3)' 367 | extern ssize_t write (int __fd, const void *__buf, size_t __n) __wur | ^~~~~ >> huge_count_read_write.c:25:15: warning: 'read' writing 4294967295 bytes into a region of size 25 overflows the destination [-Wstringop-overflow=] 25 | ret = read(filedesc, buf, 0xfffffffful); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ huge_count_read_write.c:14:14: note: destination object 'buf' of size 25 14 | char buf[25]; | ^~~ In file included from huge_count_read_write.c:8: /usr/include/unistd.h:360:16: note: in a call to function 'read' declared with attribute 'access (write_only, 2, 3)' 360 | extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur | ^~~~
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