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authorJason Wessel <jason.wessel@windriver.com>2019-08-05 09:32:37 -0700
committerRichard Purdie <richard.purdie@linuxfoundation.org>2019-08-07 16:08:15 +0100
commit6cac15e514f703a2f23d16c104cbea4162da7a9d (patch)
tree6dd91a376ccfaff5981d4c7a5fecd009b52a88e8 /meta/recipes-devtools/pseudo
parent3338776f11e6ebf3fd947c592ca8202315619f69 (diff)
downloadpoky-6cac15e514f703a2f23d16c104cbea4162da7a9d.tar.gz
pseudo: Fix openat() with a symlink pointing to a directory
While working with ostree disk generation in conjunction with wic, I found a problem with pseudo where it tried to resolve a symlink when it shouldn't, based on openat() flags. A C program has been constructed to test pseudo to show that it is working properly with the correct behavior around openat(). #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <sys/stat.h> #include <dirent.h> #include <unistd.h> #include <fcntl.h> int main() { /* * Tested with: gcc -Wall -o app app.c ; echo "no pseudo" ; * ./app ; echo "pseudo"; pseudo ./app */ system("rm -rf tdir tlink"); system("mkdir tdir"); system("ln -s tdir tlink"); DIR *dir = opendir("."); int dfd = dirfd(dir); int target_dfd = openat (dfd, "tlink", O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC | O_NOFOLLOW); if (target_dfd == -1) { printf("Test 1 good\n"); } else { printf("Test 1 failed\n"); close(target_dfd); } target_dfd = openat (dfd, "tlink", O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC); if (target_dfd == -1) { printf("Test 2 failed\n"); } else { printf("Test 2 good\n"); close(target_dfd); } /* Test 3 make sure the owner of the link is root */ struct stat sbuf; if (!lstat("tlink", &sbuf) && sbuf.st_uid == 0) { printf("Test 3 good\n"); } else { printf("Test 3 failed\n"); } /* Test 4 tests open with the "rb" flag, owner should not change */ int ofd = openat(dfd,"./tlink", O_RDONLY|O_CLOEXEC); if (ofd >= 0) { if (fstat(ofd, &sbuf) != 0) printf("ERROR in fstat test 4\n"); else if (sbuf.st_uid == 0) printf("Test 4 good\n"); close(ofd); } else { printf("Test 4 failed with openat()\n"); } /* Test pseudo db to see the fstat() above did not delete the DB entry */ if (!lstat("tlink", &sbuf) && sbuf.st_uid == 0) printf("Test 5 good\n"); else printf("Test 5 failed... tlink is owned by %i and not 0\n", sbuf.st_uid); return 0; } int main() { /* Tested with: gcc -Wall -o app app.c ; echo "no pseudo" ; ./app ; echo "pseudo"; pseudo ./app */ system("rm -rf tdir tlink"); system("mkdir tdir"); system("ln -s tdir tlink"); DIR *dir = opendir("."); int dfd = dirfd(dir); int target_dfd = openat (dfd, "tlink", O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC | O_NOFOLLOW); if (target_dfd == -1) { printf("This is right\n"); } else { printf("This is broken\n"); } return 0; } Many thanks to Peter Seebach for fixing the problem in the pseudo code to use the same logic which was already there for the AT_SYMLINK_NOFOLLOW. Also updated is the license MD5 checksum since the master branch of pseudo has had the SPDX data updated. (From OE-Core rev: a98ea4be5ce19ff380ca500ba1ef3da490ec4556) Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'meta/recipes-devtools/pseudo')
-rw-r--r--meta/recipes-devtools/pseudo/pseudo.inc2
-rw-r--r--meta/recipes-devtools/pseudo/pseudo_git.bb2
2 files changed, 2 insertions, 2 deletions
diff --git a/meta/recipes-devtools/pseudo/pseudo.inc b/meta/recipes-devtools/pseudo/pseudo.inc
index 8b05735bb1..8b34909726 100644
--- a/meta/recipes-devtools/pseudo/pseudo.inc
+++ b/meta/recipes-devtools/pseudo/pseudo.inc
@@ -4,7 +4,7 @@
4 4
5SUMMARY = "Pseudo gives fake root capabilities to a normal user" 5SUMMARY = "Pseudo gives fake root capabilities to a normal user"
6HOMEPAGE = "http://git.yoctoproject.org/cgit/cgit.cgi/pseudo" 6HOMEPAGE = "http://git.yoctoproject.org/cgit/cgit.cgi/pseudo"
7LIC_FILES_CHKSUM = "file://COPYING;md5=243b725d71bb5df4a1e5920b344b86ad" 7LIC_FILES_CHKSUM = "file://COPYING;md5=a1d8023a6f953ac6ea4af765ff62d574"
8SECTION = "base" 8SECTION = "base"
9LICENSE = "LGPL2.1" 9LICENSE = "LGPL2.1"
10DEPENDS = "sqlite3 attr" 10DEPENDS = "sqlite3 attr"
diff --git a/meta/recipes-devtools/pseudo/pseudo_git.bb b/meta/recipes-devtools/pseudo/pseudo_git.bb
index 51db84c4d4..6cf711e4c2 100644
--- a/meta/recipes-devtools/pseudo/pseudo_git.bb
+++ b/meta/recipes-devtools/pseudo/pseudo_git.bb
@@ -8,7 +8,7 @@ SRC_URI = "git://git.yoctoproject.org/pseudo \
8 file://toomanyfiles.patch \ 8 file://toomanyfiles.patch \
9 " 9 "
10 10
11SRCREV = "3fa7c853e0bcd6fe23f7524c2a3c9e3af90901c3" 11SRCREV = "060058bb29f70b244e685b3c704eb0641b736f73"
12S = "${WORKDIR}/git" 12S = "${WORKDIR}/git"
13PV = "1.9.0+git${SRCPV}" 13PV = "1.9.0+git${SRCPV}"
14 14