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Handle stat64() call

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This fixes missing modification of timestamps in stat() calls for
programs built with large file support (-D_FILE_OFFSET_BITS=64), both
32- and 64-bit.

Demo code:

  $ cat <<EOF >test.c
  #include <sys/stat.h>
  int main()
  {
      struct stat buf;
      return stat("/", &buf);
  }
  EOF

32-bit build:

  $ nix-shell -p gcc --argstr system i686-linux

  nix-shell$ gcc test.c && ltrace ./a.out
  __libc_start_main([ "./a.out" ] <unfinished ...>
  stat(0x804a008, 0xffa4b644, 895, 0) = 0
  +++ exited (status 0) +++

  nix-shell$ gcc -D_FILE_OFFSET_BITS=64 test.c && ltrace ./a.out
  __libc_start_main([ "./a.out" ] <unfinished ...>
  stat64(0x804a008, 0xffdcf61c, 100, 0xffdcfaeb) = 0
  +++ exited (status 0) +++

  nix-shell$ file a.out
  a.out: ELF 32-bit LSB executable, Intel 80386, [...]

64-bit build:

  $ nix-shell -p gcc

  nix-shell$ gcc test.c && ltrace ./a.out
  stat(0x402004, 0x7ffc50a9d740, 0x7ffc50a9d908, 0x403db0) = 0
  +++ exited (status 0) +++

  nix-shell$ gcc -D_FILE_OFFSET_BITS=64 test.c && ltrace ./a.out
  stat64(0x402004, 0x7ffd5cbafba0, 0x7ffd5cbafd68, 0x403db0) = 0
  +++ exited (status 0) +++

  nix-shell$ file a.out
  a.out: ELF 64-bit LSB executable, x86-64, [...]
This commit is contained in:
Bjørn Forsman
2025-07-09 17:32:54 +02:00
parent 6404d81f63
commit 53ba71e547
1 changed files with 7 additions and 0 deletions
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7
src/libfaketime.c
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@@ -224,6 +224,7 @@ static int (*real_fxstat) (int, int, struct stat *);
static int (*real_fxstatat) (int, int, const char *, struct stat *, int);
static int (*real_lxstat) (int, const char *, struct stat *);
#if !defined(__APPLE__) || !__DARWIN_ONLY_64_BIT_INO_T
static int (*real_stat64) (const char *, struct stat64 *);
static int (*real_xstat64) (int, const char *, struct stat64 *);
static int (*real_fxstat64) (int, int , struct stat64 *);
static int (*real_fxstatat64) (int, int , const char *, struct stat64 *, int);
@@ -1272,6 +1273,11 @@ int __lxstat (int ver, const char *path, struct stat *buf)
STAT_HANDLER(lxstat, buf, ver, path, buf);
}
int stat64 (const char *path, struct stat64 *buf)
{
STAT64_HANDLER(stat64, buf, path, buf);
}
/* Contributed by Philipp Hachtmann in version 0.6 */
int __xstat64 (int ver, const char *path, struct stat64 *buf)
{
@@ -2840,6 +2846,7 @@ static void ftpl_really_init(void)
real_fxstatat = dlsym(RTLD_NEXT, "__fxstatat");
real_lxstat = dlsym(RTLD_NEXT, "__lxstat");
#if !defined(__APPLE__) || !__DARWIN_ONLY_64_BIT_INO_T
real_stat64 = dlsym(RTLD_NEXT, "stat64");
real_xstat64 = dlsym(RTLD_NEXT,"__xstat64");
real_fxstat64 = dlsym(RTLD_NEXT, "__fxstat64");
real_fxstatat64 = dlsym(RTLD_NEXT, "__fxstatat64");