From b0f07fc79afbee7e144c22933017cc34581a51b8 Mon Sep 17 00:00:00 2001 From: bapt Date: Fri, 20 Nov 2015 08:45:59 +0000 Subject: install: do not follow symlinks In case the target of install is a dead symlink, install(1) used to not consider it as "existing" because of the usage of stat(2) instead of lstat(2). meaning the old file (the symlink) is not removed before the new file is created. The symlink is being followed and the new file becoming the target of the symlink instead of the target of install(1) Reviewed by: jhb, brooks MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D4191 --- usr.bin/xinstall/xinstall.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) (limited to 'usr.bin/xinstall') diff --git a/usr.bin/xinstall/xinstall.c b/usr.bin/xinstall/xinstall.c index 30cc6c7..1121cff 100644 --- a/usr.bin/xinstall/xinstall.c +++ b/usr.bin/xinstall/xinstall.c @@ -754,10 +754,7 @@ install(const char *from_name, const char *to_name, u_long fset, u_int flags) devnull = 1; } - if (!dolink) - target = (stat(to_name, &to_sb) == 0); - else - target = (lstat(to_name, &to_sb) == 0); + target = (lstat(to_name, &to_sb) == 0); if (dolink) { if (target && !safecopy) { @@ -772,8 +769,7 @@ install(const char *from_name, const char *to_name, u_long fset, u_int flags) return; } - /* Only install to regular files. */ - if (target && !S_ISREG(to_sb.st_mode)) { + if (target && !S_ISREG(to_sb.st_mode) && !S_ISLNK(to_sb.st_mode)) { errno = EFTYPE; warn("%s", to_name); return; @@ -786,7 +782,7 @@ install(const char *from_name, const char *to_name, u_long fset, u_int flags) err(EX_OSERR, "%s", from_name); /* If we don't strip, we can compare first. */ - if (docompare && !dostrip && target) { + if (docompare && !dostrip && target && S_ISREG(to_sb.st_mode)) { if ((to_fd = open(to_name, O_RDONLY, 0)) < 0) err(EX_OSERR, "%s", to_name); if (devnull) @@ -838,7 +834,7 @@ install(const char *from_name, const char *to_name, u_long fset, u_int flags) /* * Compare the stripped temp file with the target. */ - if (docompare && dostrip && target) { + if (docompare && dostrip && target && S_ISREG(to_sb.st_mode)) { temp_fd = to_fd; /* Re-open to_fd using the real target name. */ @@ -872,9 +868,7 @@ install(const char *from_name, const char *to_name, u_long fset, u_int flags) } (void) close(temp_fd); } - } - - if (dostrip && (!docompare || !target)) + } else if (dostrip) digestresult = digest_file(tempfile); /* -- cgit v1.1