diff options
| author | Ulrich Drepper <drepper@gmail.com> | 2011-12-17 20:18:42 -0500 |
|---|---|---|
| committer | Ulrich Drepper <drepper@gmail.com> | 2011-12-17 20:18:42 -0500 |
| commit | 97ac2654b2d831acaa18a2b018b0736245903fd2 (patch) | |
| tree | 1cbd1360431dcd1a7f5dd77151ecefe6efd95920 | |
| parent | b813d73fd7bb94390b787e86138c1169b64ca1ff (diff) | |
| download | glibc-97ac2654b2d831acaa18a2b018b0736245903fd2.zip glibc-97ac2654b2d831acaa18a2b018b0736245903fd2.tar.gz glibc-97ac2654b2d831acaa18a2b018b0736245903fd2.tar.bz2 | |
Check values from TZ file header
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | NEWS | 2 | ||||
| -rw-r--r-- | time/tzfile.c | 53 |
3 files changed, 50 insertions, 10 deletions
@@ -1,3 +1,8 @@ +2011-12-17 Ulrich Drepper <drepper@gmail.com> + + [BZ #13506] + * time/tzfile.c (__tzfile_read): Check values from file header. + 2011-11-21 Will Schmidt <will_schmidt@vnet.ibm.com> * powerpc/powerpc32/sysdep.h: Define SETUP_GOT_ACCESS() macro. @@ -12,7 +12,7 @@ Version 2.15 6779, 6783, 9696, 10103, 10709, 11589, 12403, 12847, 12868, 12852, 12874, 12885, 12892, 12907, 12922, 12935, 13007, 13021, 13067, 13068, 13090, 13092, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13179, 13192, - 13268, 13276, 13291, 13335, 13337, 13344, 13358, 13367 + 13268, 13276, 13291, 13335, 13337, 13344, 13358, 13367, 13506 * New program pldd to list loaded object of a process Implemented by Ulrich Drepper. diff --git a/time/tzfile.c b/time/tzfile.c index 144e20b..402389c 100644 --- a/time/tzfile.c +++ b/time/tzfile.c @@ -234,23 +234,58 @@ __tzfile_read (const char *file, size_t extra, char **extrap) goto read_again; } + if (__builtin_expect (num_transitions + > ((SIZE_MAX - (__alignof__ (struct ttinfo) - 1)) + / (sizeof (time_t) + 1)), 0)) + goto lose; total_size = num_transitions * (sizeof (time_t) + 1); total_size = ((total_size + __alignof__ (struct ttinfo) - 1) & ~(__alignof__ (struct ttinfo) - 1)); types_idx = total_size; - total_size += num_types * sizeof (struct ttinfo) + chars; + if (__builtin_expect (num_types + > (SIZE_MAX - total_size) / sizeof (struct ttinfo), 0)) + goto lose; + total_size += num_types * sizeof (struct ttinfo); + if (__builtin_expect (chars > SIZE_MAX - total_size, 0)) + goto lose; + total_size += chars; + if (__builtin_expect (__alignof__ (struct leap) - 1 + > SIZE_MAX - total_size, 0)) + goto lose; total_size = ((total_size + __alignof__ (struct leap) - 1) & ~(__alignof__ (struct leap) - 1)); leaps_idx = total_size; + if (__builtin_expect (num_leaps + > (SIZE_MAX - total_size) / sizeof (struct leap), 0)) + goto lose; total_size += num_leaps * sizeof (struct leap); - tzspec_len = (sizeof (time_t) == 8 && trans_width == 8 - ? st.st_size - (ftello (f) - + num_transitions * (8 + 1) - + num_types * 6 - + chars - + num_leaps * 12 - + num_isstd - + num_isgmt) - 1 : 0); + tzspec_len = 0; + if (sizeof (time_t) == 8 && trans_width == 8) + { + off_t rem = st.st_size - ftello (f); + if (__builtin_expect (rem < 0 + || (size_t) rem < (num_transitions * (8 + 1) + + num_types * 6 + + chars), 0)) + goto lose; + tzspec_len = (size_t) rem - (num_transitions * (8 + 1) + + num_types * 6 + + chars); + if (__builtin_expect (num_leaps > SIZE_MAX / 12 + || tzspec_len < num_leaps * 12, 0)) + goto lose; + tzspec_len -= num_leaps * 12; + if (__builtin_expect (tzspec_len < num_isstd, 0)) + goto lose; + tzspec_len -= num_isstd; + if (__builtin_expect (tzspec == 0 || tzspec_len - 1 < num_isgmt, 0)) + goto lose; + tzspec_len -= num_isgmt + 1; + if (__builtin_expect (SIZE_MAX - total_size < tzspec_len, 0)) + goto lose; + } + if (__builtin_expect (SIZE_MAX - total_size - tzspec_len < extra, 0)) + goto lose; /* Allocate enough memory including the extra block requested by the caller. */ |