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Redo preserve_fds support to remap high fds so we can get the most

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out of closefrom().  The fds are then restored after closefrom().
This commit is contained in:
Todd C. Miller
2013-12-24 15:01:00 -07:00
parent 76544011ed
commit 4d80e7cea4
3 changed files with 132 additions and 39 deletions
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17
src/sudo.h
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@@ -122,10 +122,13 @@ struct user_details {
#define CD_SET_UTMP 0x2000
#define CD_EXEC_BG 0x4000
struct preserved_fds {
int maxfd;
fd_set *fds;
struct preserved_fd {
TAILQ_ENTRY(preserved_fd) entries;
int lowfd;
int highfd;
int flags;
};
TAILQ_HEAD(preserved_fd_list, preserved_fd);
struct command_details {
uid_t uid;
@@ -138,7 +141,7 @@ struct command_details {
int ngroups;
int closefrom;
int flags;
struct preserved_fds preserved_fds;
struct preserved_fd_list preserved_fds;
struct passwd *pw;
GETGROUPS_T *groups;
const char *command;
@@ -247,8 +250,8 @@ void save_signals(void);
void preload_static_symbols(void);
/* preserve_fds.c */
void add_preserved_fd(struct preserved_fds *pfds, int fd);
void closefrom_except(int startfd, struct preserved_fds *pfds);
void parse_preserved_fds(struct preserved_fds *pfds, const char *fdstr);
int add_preserved_fd(struct preserved_fd_list *pfds, int fd);
void closefrom_except(int startfd, struct preserved_fd_list *pfds);
void parse_preserved_fds(struct preserved_fd_list *pfds, const char *fdstr);
#endif /* _SUDO_SUDO_H */