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libio: freopen of default streams crashes in old programs [BZ #24632]

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As seen with very old i386 GCC binaries.
This commit is contained in:
Florian Weimer 2019-06-12 14:48:33 +02:00
parent 744e829637
commit cfa611447b
3 changed files with 12 additions and 1 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2019-06-12 Florian Weimer <fweimer@redhat.com>
[BZ #24632]
* libio/libioP.h (_IO_JUMPS_FUNC_UPDATE): New macro.
* libio/freopen.c (freopen): Use it.
2019-06-12 Florian Weimer <fweimer@redhat.com>
Linux: Deprecate sysctl.

2
libio/freopen.c
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@ -62,7 +62,7 @@ freopen (const char *filename, const char *mode, FILE *fp)
to the old libio may be passed into shared C library and wind
up here. */
_IO_old_file_close_it (fp);
_IO_JUMPS_FILE_plus (fp) = &_IO_old_file_jumps;
_IO_JUMPS_FUNC_UPDATE (fp, &_IO_old_file_jumps);
result = _IO_old_file_fopen (fp, gfilename, mode);
}
else

5
libio/libioP.h
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@ -108,9 +108,14 @@
(IO_validate_vtable \
(*(struct _IO_jump_t **) ((void *) &_IO_JUMPS_FILE_plus (THIS) \
+ (THIS)->_vtable_offset)))
# define _IO_JUMPS_FUNC_UPDATE(THIS, VTABLE) \
(*(const struct _IO_jump_t **) ((void *) &_IO_JUMPS_FILE_plus (THIS) \
+ (THIS)->_vtable_offset) = (VTABLE))
# define _IO_vtable_offset(THIS) (THIS)->_vtable_offset
#else
# define _IO_JUMPS_FUNC(THIS) (IO_validate_vtable (_IO_JUMPS_FILE_plus (THIS)))
# define _IO_JUMPS_FUNC_UPDATE(THIS, VTABLE) \
(_IO_JUMPS_FILE_plus (THIS) = (VTABLE))
# define _IO_vtable_offset(THIS) 0
#endif
#define _IO_WIDE_JUMPS_FUNC(THIS) _IO_WIDE_JUMPS(THIS)