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vfs_lookup: Allow PATH_MAX-1 symlinks

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Previously, symlinks in FreeBSD were artificially limited to PATH_MAX-2.

Add a short test case to verify the change.

Submitted by:	Gaurav Gangalwar <ggangalwar AT isilon.com>
Reviewed by:	kib
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D12589
This commit is contained in:
Conrad Meyer 2017-11-17 19:25:39 +00:00
parent d7ff64a9b1
commit 38d84d683e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=325957
3 changed files with 20 additions and 1 deletions
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2
sys/kern/vfs_lookup.c
View File

@ -499,7 +499,7 @@ namei(struct nameidata *ndp)
error = ENOENT;
break;
}
if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
if (linklen + ndp->ni_pathlen > MAXPATHLEN) {
if (ndp->ni_pathlen > 1)
uma_zfree(namei_zone, cp);
error = ENAMETOOLONG;

2
tests/sys/vfs/Makefile
View File

@ -7,6 +7,8 @@ TESTSDIR= ${TESTSBASE}/sys/vfs
ATF_TESTS_C+= lookup_cap_dotdot
CFLAGS.lookup_cap_dotdot.c+= -I${SRCTOP}/tests
#ATF_TESTS_SH+= lookup_test
TAP_TESTS_SH+= trailing_slash
.include <bsd.test.mk>

17
tests/sys/vfs/lookup_test.sh Normal file
View File

@ -0,0 +1,17 @@
# $FreeBSD$
long_symlink_head()
{
atf_set "descr" "Test for 1023 (PATH_MAX-1) symlink support"
}
long_symlink_body()
{
atf_check -s exit:0 ln -s aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa sym_long
# was: "stat: sym_long: stat: File name too long"; exit 1
atf_check -s exit:0 -o ignore stat -L sym_long
}
atf_init_test_cases()
{
atf_add_test_case long_symlink
}