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49 lines
1.6 KiB
Diff
49 lines
1.6 KiB
Diff
Description: do not use fd_set with potentially large indices
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Author: Helmut Grohne <helmut@subdivi.de>
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Bug-Debian: http://bugs.debian.org/754594
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Last-Update: 2014-07-15
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--- vlock-2.2.2.orig/src/process.c
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+++ vlock-2.2.2/src/process.c
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@@ -107,7 +107,7 @@ void ensure_death(pid_t pid)
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/* Close all possibly open file descriptors except the ones specified in the
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* given set. */
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-static void close_fds(fd_set *except_fds)
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+static void close_fds(int except_fd)
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{
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struct rlimit r;
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int maxfd;
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@@ -122,7 +122,8 @@ static void close_fds(fd_set *except_fds
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/* Close all possibly open file descriptors except STDIN_FILENO,
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* STDOUT_FILENO and STDERR_FILENO. */
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for (int fd = 0; fd < maxfd; fd++)
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- if (!FD_ISSET(fd, except_fds))
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+ if(fd != STDIN_FILENO && fd != STDOUT_FILENO && fd != STDERR_FILENO
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+ && fd != except_fd)
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(void) close(fd);
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}
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@@ -175,7 +176,6 @@ bool create_child(struct child_process *
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if (child->pid == 0) {
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/* Child. */
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- fd_set except_fds;
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if (child->stdin_fd == REDIRECT_PIPE)
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(void) dup2(stdin_pipe[0], STDIN_FILENO);
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@@ -198,13 +198,7 @@ bool create_child(struct child_process *
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else if (child->stderr_fd != NO_REDIRECT)
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(void) dup2(child->stderr_fd, STDERR_FILENO);
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- FD_ZERO(&except_fds);
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- FD_SET(STDIN_FILENO, &except_fds);
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- FD_SET(STDOUT_FILENO, &except_fds);
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- FD_SET(STDERR_FILENO, &except_fds);
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- FD_SET(status_pipe[1], &except_fds);
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-
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- (void) close_fds(&except_fds);
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+ (void) close_fds(status_pipe[1]);
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(void) setgid(getgid());
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(void) setuid(getuid());
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