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| author | Dmitry V. Levin <ldv@altlinux.org> | 2018-01-07 02:03:41 +0000 |
|---|---|---|
| committer | Dmitry V. Levin <ldv@altlinux.org> | 2018-01-12 14:49:49 +0000 |
| commit | 52a713fdd0a30e1bd79818e2e3c4ab44ddca1a94 (patch) | |
| tree | 54015de9e9109423e62967df2f6b0eb2b9a4284c /io/Makefile | |
| parent | 249a5895f120b13290a372a49bb4b499e749806f (diff) | |
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linux: make getcwd(3) fail if it cannot obtain an absolute path [BZ #22679]
Currently getcwd(3) can succeed without returning an absolute path
because the underlying getcwd syscall, starting with linux commit
v2.6.36-rc1~96^2~2, may succeed without returning an absolute path.
This is a conformance issue because "The getcwd() function shall
place an absolute pathname of the current working directory
in the array pointed to by buf, and return buf".
This is also a security issue because a non-absolute path returned
by getcwd(3) causes a buffer underflow in realpath(3).
Fix this by checking the path returned by getcwd syscall and falling
back to generic_getcwd if the path is not absolute, effectively making
getcwd(3) fail with ENOENT. The error code is chosen for consistency
with the case when the current directory is unlinked.
[BZ #22679]
CVE-2018-1000001
* sysdeps/unix/sysv/linux/getcwd.c (__getcwd): Fall back to
generic_getcwd if the path returned by getcwd syscall is not absolute.
* io/tst-getcwd-abspath.c: New test.
* io/Makefile (tests): Add tst-getcwd-abspath.
Diffstat (limited to 'io/Makefile')
| -rw-r--r-- | io/Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/io/Makefile b/io/Makefile index 09b4f468b0..2117cb6b62 100644 --- a/io/Makefile +++ b/io/Makefile @@ -71,7 +71,7 @@ tests := test-utime test-stat test-stat2 test-lfs tst-getcwd \ tst-mknodat tst-mkfifoat tst-ttyname_r bug-ftw5 \ tst-posix_fallocate tst-posix_fallocate64 \ tst-fts tst-fts-lfs tst-open-tmpfile \ - tst-copy_file_range \ + tst-copy_file_range tst-getcwd-abspath \ # This test includes the compat implementation of copy_file_range, # which uses internal, unexported libc functions. |