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Urgent nolibc pull request for v6.1

Browse source 
This pull request contains a couple of commits that fix string-function
 bugs introduced by:
 
 96980b833a ("tools/nolibc/string: do not use __builtin_strlen() at -O0")
 66b6f755ad ("rcutorture: Import a copy of nolibc")
 
 These appeared in v5.19 and v5.0, respectively, but it would be good
 to get these fixes in sooner rather than later.  Commits providing the
 corresponding tests are in -rcu and I expect to submit them into the
 upcoming v6.2 merge window.
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Merge tag 'nolibc-urgent.2022.10.28a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

Pull nolibc fixes from Paul McKenney:
 "This contains a couple of fixes for string-function bugs"

* tag 'nolibc-urgent.2022.10.28a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu:
  tools/nolibc/string: Fix memcmp() implementation
  tools/nolibc: Fix missing strlen() definition and infinite loop with gcc-12
This commit is contained in:
Linus Torvalds 2022-11-01 13:15:14 -07:00
commit 54917c90c2
1 changed files with 10 additions and 7 deletions
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17
tools/include/nolibc/string.h
View file

@ -19,9 +19,9 @@ static __attribute__((unused))
int memcmp(const void *s1, const void *s2, size_t n)
{
size_t ofs = 0;
char c1 = 0;
int c1 = 0;
while (ofs < n && !(c1 = ((char *)s1)[ofs] - ((char *)s2)[ofs])) {
while (ofs < n && !(c1 = ((unsigned char *)s1)[ofs] - ((unsigned char *)s2)[ofs])) {
ofs++;
}
return c1;
@ -125,14 +125,18 @@ char *strcpy(char *dst, const char *src)
}
/* this function is only used with arguments that are not constants or when
* it's not known because optimizations are disabled.
* it's not known because optimizations are disabled. Note that gcc 12
* recognizes an strlen() pattern and replaces it with a jump to strlen(),
* thus itself, hence the asm() statement below that's meant to disable this
* confusing practice.
*/
static __attribute__((unused))
size_t nolibc_strlen(const char *str)
size_t strlen(const char *str)
{
size_t len;
for (len = 0; str[len]; len++);
for (len = 0; str[len]; len++)
asm("");
return len;
}
@ -140,13 +144,12 @@ size_t nolibc_strlen(const char *str)
* the two branches, then will rely on an external definition of strlen().
*/
#if defined(__OPTIMIZE__)
#define nolibc_strlen(x) strlen(x)
#define strlen(str) ({ \
__builtin_constant_p((str)) ? \
__builtin_strlen((str)) : \
nolibc_strlen((str)); \
})
#else
#define strlen(str) nolibc_strlen((str))
#endif
static __attribute__((unused))