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From: John R. <jr...@bi...> - 2022-06-11 23:06:12
|
On 6/9/22 14:10, Mark Wielaard wrote: > https://sourceware.org/git/gitweb.cgi?p=valgrind.git;h=3aee8a29447ea14108eb5d4ab3c1f7677767296a > > commit 3aee8a29447ea14108eb5d4ab3c1f7677767296a > Author: Mark Wielaard <snipped> > Date: Thu Jun 9 23:06:36 2022 +0200 > > syswrap-linux.c (sys_execveat): Define path as const HChar * This change, announced in mailing lists [valgrind-developers] and [valgrind] on 2022-06-09, is superficial and ignores the hint of a larger, more serious problem. Valgrind's source code is sloppy with regard to "'const' correctness." The C language keyword 'const' is omitted willy-nilly, which increases the chances that bugs will be overlooked despite being detectable at compile time by a modern compiler. In two days of hacking I found 120 regions in 32 files where 'const' was omitted: git diff master --stat | wc -l; git diff master | grep -c '@@' and that was just by hunting near instances of "HChar *" which often should be "HChar const *". See the patch in https://bugs.kde.org/show_bug.cgi?id=455168 . The problems are exacerbated (or perhaps caused) by oversights (or errors) in the Standard for C language stdlib. For instance: int execve(const char *pathname, char *const argv[], char *const envp[]); should be int execve(const char *pathname, char const *const argv[], char const *const envp[]); Note the added 'const' in the declaration of the second and third parameters. When 'execve' fails, then control returns to the program (which often is a shell!) and the program is going to assume that the operating system has not scribbled on the characters in the argument or environment strings. But only the revised declaration states that property explicitly. A similar bug in the Standard is: long strtol(const char *nptr, char **endptr, int base); which should be long strtol(const char *nptr, char const **endptr, int base); If endptr is not NULL, then upon return from strtol *endptr designates a substring of nptr. The characters of nptr are const (both the application programmer and strtol are not allowed to write them), so therefore the characters of *endptr also must be 'const'. Confimation of this problem can be seen in the source code to strtol: ===== glibc-2.29-32-g6d8eaf4a25/stdlib/strtol_l.c INT INTERNAL (__strtol_l) (const STRING_TYPE *nptr, STRING_TYPE **endptr, int base, int group, locale_t loc) ----- /* Store in ENDPTR the address of one character past the last character we converted. */ if (endptr != NULL) *endptr = (STRING_TYPE *) s; ----- const STRING_TYPE *save, *end; ----- *endptr = (STRING_TYPE *) &save[-1]; ----- /* There was no number to convert. */ *endptr = (STRING_TYPE *) nptr; ===== where "gcc -Wcast-qual" will complain about 'const' being elided. |