This fixes a bug on 32-bit Cygwin that was introduced in commit 84252946, "Cygwin: fstatat, fchownat: support the AT_EMPTY_PATH flag".
Add a comment explaining why fstat should not be called. Addresses: https://cygwin.com/pipermail/cygwin/2021-January/247399.html --- winsup/cygwin/release/3.2.0 | 3 +++ winsup/cygwin/syscalls.cc | 5 ++++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/winsup/cygwin/release/3.2.0 b/winsup/cygwin/release/3.2.0 index 22f78e7a7..132d5c810 100644 --- a/winsup/cygwin/release/3.2.0 +++ b/winsup/cygwin/release/3.2.0 @@ -42,3 +42,6 @@ Bug Fixes - Fix return value of sqrtl on negative infinity. Addresses: https://cygwin.com/pipermail/cygwin/2020-October/246606.html + +- Fix a bug in fstatat(2) on 32 bit that could cause it to return garbage. + Addresses: https://cygwin.com/pipermail/cygwin/2021-January/247399.html diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc index 885ca375a..525efecf3 100644 --- a/winsup/cygwin/syscalls.cc +++ b/winsup/cygwin/syscalls.cc @@ -1929,6 +1929,9 @@ _fstat64_r (struct _reent *ptr, int fd, struct stat *buf) } #ifdef __i386__ +/* This entry point is retained only to serve old 32 bit applications +built under Cygwin 1.3.x or earlier. Newer 32 bit apps are redirected +to fstat64; see NEW_FUNCTIONS in Makefile.in. */ extern "C" int fstat (int fd, struct stat *buf) { @@ -4852,7 +4855,7 @@ fstatat (int dirfd, const char *__restrict pathname, struct stat *__restrict st, cwdstuff::cwd_lock.release (); } else - return fstat (dirfd, st); + return fstat64 (dirfd, st); } path_conv pc (path, ((flags & AT_SYMLINK_NOFOLLOW) ? PC_SYM_NOFOLLOW : PC_SYM_FOLLOW) -- 2.30.0
