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Dmitry V. Levin 771c846a71 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.

(cherry picked from commit 52a713fdd0)
2018-01-16 09:07:08 +01:00
..
bits Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
sys Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
access.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
bug-ftw1.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
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bug-ftw3.c
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bug-ftw5.c
chdir.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
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fts64.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fts.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fts.h fts: Fix symbol redirect for fts_set [BZ #21289] 2017-03-31 09:30:52 +02:00
ftw64.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
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ftw.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
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ftwtest.c
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getcwd.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
getdirname.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
getwd.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
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lxstat.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
Makefile linux: make getcwd(3) fail if it cannot obtain an absolute path [BZ #22679] 2018-01-16 09:07:08 +01:00
mkdir.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
mkdirat.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
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poll.h
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symlink.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
symlinkat.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
test-lfs.c Fix MIPS n32 lseek, lseek64 (bug 21019). 2017-01-02 23:09:25 +00:00
test-stat2.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
test-stat.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
test-utime.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
tst-faccessat.c
tst-fchmodat.c
tst-fchownat.c
tst-fcntl.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
tst-fstatat.c
tst-fts-lfs.c
tst-fts.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
tst-futimesat.c
tst-getcwd-abspath.c linux: make getcwd(3) fail if it cannot obtain an absolute path [BZ #22679] 2018-01-16 09:07:08 +01:00
tst-getcwd.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
tst-linkat.c
tst-mkdirat.c
tst-mkfifoat.c
tst-mknodat.c
tst-open-tmpfile.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
tst-openat.c
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tst-readlinkat.c
tst-renameat.c
tst-statvfs.c
tst-symlinkat.c
tst-ttyname_r.c
tst-unlinkat.c
ttyname_r.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
ttyname.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
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Versions
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