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Restrict shm_open and shm_unlink to SHMDIR. Fixes bugs 14752 and 15763.

This commit is contained in:
Ondřej Bílka 2013-10-31 13:58:01 +01:00
parent 8a43e768d9
commit 5d30d85329
4 changed files with 31 additions and 14 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2013-10-31 Ondřej Bílka <neleai@seznam.cz>
[BZ #14752], [BZ #15763]
* sysdeps/unix/sysv/linux/shm_open.c (shm_open, shm_unlink):
Validate name.
* rt/tst_shm.c: Add test for escaping directory.
2013-10-31 Andreas Schwab <schwab@suse.de>
[BZ #15917]

16
NEWS
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@ -10,14 +10,14 @@ Version 2.19
* The following bugs are resolved with this release:
156, 431, 832, 2801, 9954, 10278, 11087, 13028, 13982, 13985, 14029,
14155, 14547, 14699, 14876, 14910, 15048, 15218, 15277, 15308, 15362,
15400, 15427, 15522, 15531, 15532, 15608, 15609, 15610, 15632, 15640,
15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748, 15749,
15754, 15760, 15764, 15797, 15799, 15825, 15844, 15847, 15849, 15855,
15856, 15857, 15859, 15867, 15886, 15887, 15890, 15892, 15893, 15895,
15897, 15905, 15909, 15917, 15919, 15921, 15923, 15939, 15948, 15963,
15966, 15988, 16032, 16034, 16036, 16037, 16041, 16071, 16072, 16074,
16078.
14155, 14547, 14699, 14752, 14876, 14910, 15048, 15218, 15277, 15308,
15362, 15400, 15427, 15522, 15531, 15532, 15608, 15609, 15610, 15632,
15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15844, 15847,
15849, 15855, 15856, 15857, 15859, 15867, 15886, 15887, 15890, 15892,
15893, 15895, 15897, 15905, 15909, 15917, 15919, 15921, 15923, 15939,
15948, 15963, 15966, 15988, 16032, 16034, 16036, 16037, 16041, 16071,
16072, 16074, 16078.
* CVE-2012-4412 The strcoll implementation caches indices and rules for
large collation sequences to optimize multiple passes. This cache

8
rt/tst-shm.c
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@ -134,6 +134,14 @@ do_test (void)
int status2;
struct stat64 st;
fd = shm_open ("/../escaped", O_RDWR | O_CREAT | O_TRUNC | O_EXCL, 0600);
if (fd != -1)
{
perror ("read file outside of SHMDIR directory");
return 1;
}
/* Create the shared memory object. */
fd = shm_open ("/shm-test", O_RDWR | O_CREAT | O_TRUNC | O_EXCL, 0600);
if (fd == -1)

14
sysdeps/unix/sysv/linux/shm_open.c
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@ -148,14 +148,15 @@ shm_open (const char *name, int oflag, mode_t mode)
while (name[0] == '/')
++name;
if (name[0] == '\0')
namelen = strlen (name);
/* Validate the filename. */
if (name[0] == '\0' || namelen > NAME_MAX || strchr (name, '/') == NULL)
{
/* The name "/" is not supported. */
__set_errno (EINVAL);
return -1;
}
namelen = strlen (name);
fname = (char *) alloca (mountpoint.dirlen + namelen + 1);
__mempcpy (__mempcpy (fname, mountpoint.dir, mountpoint.dirlen),
name, namelen + 1);
@ -237,14 +238,15 @@ shm_unlink (const char *name)
while (name[0] == '/')
++name;
if (name[0] == '\0')
namelen = strlen (name);
/* Validate the filename. */
if (name[0] == '\0' || namelen > NAME_MAX || strchr (name, '/') == NULL)
{
/* The name "/" is not supported. */
__set_errno (ENOENT);
return -1;
}
namelen = strlen (name);
fname = (char *) alloca (mountpoint.dirlen + namelen + 1);
__mempcpy (__mempcpy (fname, mountpoint.dir, mountpoint.dirlen),
name, namelen + 1);