76 lines
2.5 KiB
Diff
76 lines
2.5 KiB
Diff
From d935dc7d1c150b3425dd43dc13a4dd2e2b712c26 Mon Sep 17 00:00:00 2001
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From: Paul Eggert <eggert@cs.ucla.edu>
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Date: Mon, 13 Jun 2022 17:02:54 -0700
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Subject: Avoid EOVERFLOW problems in some symlink tests
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* src/extract.c (is_directory_link): New arg ST. Caller changed.
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(is_directory_link, open_output_file):
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Use readlinkat, not fstatat, to determine whether a string
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names a symlink. This avoids EOVERFLOW issues.
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(extract_dir): Avoid duplicate calls to fstatat when
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keep_directory_symlink_option && fstatat_flags == 0
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and the file is a symlink to an existing file.
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---
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src/extract.c | 28 ++++++++++++----------------
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1 file changed, 12 insertions(+), 16 deletions(-)
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diff --git a/src/extract.c b/src/extract.c
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index fda4617..6d2543f 100644
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--- a/src/extract.c
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+++ b/src/extract.c
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@@ -982,18 +982,12 @@ apply_nonancestor_delayed_set_stat (char const *file_name, bool after_links)
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static bool
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-is_directory_link (const char *file_name)
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+is_directory_link (char const *file_name, struct stat *st)
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{
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- struct stat st;
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- int e = errno;
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- int res;
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-
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- res = (fstatat (chdir_fd, file_name, &st, AT_SYMLINK_NOFOLLOW) == 0 &&
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- S_ISLNK (st.st_mode) &&
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- fstatat (chdir_fd, file_name, &st, 0) == 0 &&
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- S_ISDIR (st.st_mode));
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- errno = e;
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- return res;
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+ char buf[1];
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+ return (0 <= readlinkat (chdir_fd, file_name, buf, sizeof buf)
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+ && fstatat (chdir_fd, file_name, st, 0) == 0
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+ && S_ISDIR (st->st_mode));
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}
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/* Given struct stat of a directory (or directory member) whose ownership
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@@ -1066,11 +1060,14 @@ extract_dir (char *file_name, int typeflag)
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|| old_files_option == OVERWRITE_OLD_FILES))
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{
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struct stat st;
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+ st.st_mode = 0;
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- if (keep_directory_symlink_option && is_directory_link (file_name))
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+ if (keep_directory_symlink_option
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+ && is_directory_link (file_name, &st))
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return 0;
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- if (deref_stat (file_name, &st) == 0)
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+ if ((st.st_mode != 0 && fstatat_flags == 0)
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+ || deref_stat (file_name, &st) == 0)
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{
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current_mode = st.st_mode;
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current_mode_mask = ALL_MODE_BITS;
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@@ -1178,9 +1175,8 @@ open_output_file (char const *file_name, int typeflag, mode_t mode,
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if (! HAVE_WORKING_O_NOFOLLOW
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&& overwriting_old_files && ! dereference_option)
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{
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- struct stat st;
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- if (fstatat (chdir_fd, file_name, &st, AT_SYMLINK_NOFOLLOW) == 0
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- && S_ISLNK (st.st_mode))
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+ char buf[1];
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+ if (0 <= readlinkat (chdir_fd, file_name, buf, sizeof buf))
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{
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errno = ELOOP;
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return -1;
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--
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cgit v1.1
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