From d5749ee7156fa25f5c649d1288f074cbdd40303c Mon Sep 17 00:00:00 2001 From: Pedro Alves Date: Mon, 1 Jul 2013 11:29:17 +0000 Subject: [PATCH] [GDBserver] hostio.c: Fallback to packet buffer size if PATH_MAX is not available. PATH_MAX is not defined on systems which have no limit on filename length, such as GNU/Hurd. As designed, the hostio RSP packets carry the paths as parameters in the request/reply packets, which themselves have an upper size limit, so lifting the filename limit completely would require a redesign with new hostio packets. While that doesn't happen, we can at least support filename lengths as long as the packet buffer can fit. gdb/gdbserver/ 2013-07-01 Pedro Alves * hostio.c (HOSTIO_PATH_MAX): Define. (require_filename, handle_open, handle_unlink, handle_readlink): Use it. --- gdb/gdbserver/ChangeLog | 6 ++++++ gdb/gdbserver/hostio.c | 16 ++++++++++++---- 2 files changed, 18 insertions(+), 4 deletions(-) diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog index 4e7fe005859..91a3f9ba75c 100644 --- a/gdb/gdbserver/ChangeLog +++ b/gdb/gdbserver/ChangeLog @@ -1,3 +1,9 @@ +2013-07-01 Pedro Alves + + * hostio.c (HOSTIO_PATH_MAX): Define. + (require_filename, handle_open, handle_unlink, handle_readlink): + Use it. + 2013-07-01 Pedro Alves * server.h: Include "pathmax.h". diff --git a/gdb/gdbserver/hostio.c b/gdb/gdbserver/hostio.c index df94d31ca70..a74c2f880df 100644 --- a/gdb/gdbserver/hostio.c +++ b/gdb/gdbserver/hostio.c @@ -50,6 +50,14 @@ safe_fromhex (char a, int *nibble) return 0; } +/* Filenames are hex encoded, so the maximum we can handle is half the + packet buffer size. Cap to PATH_MAX, if it is shorter. */ +#if !defined (PATH_MAX) || (PATH_MAX > (PBUFSIZ / 2 + 1)) +# define HOSTIO_PATH_MAX (PBUFSIZ / 2 + 1) +#else +# define HOSTIO_PATH_MAX PATH_MAX +#endif + static int require_filename (char **pp, char *filename) { @@ -64,7 +72,7 @@ require_filename (char **pp, char *filename) int nib1, nib2; /* Don't allow overflow. */ - if (count >= PATH_MAX - 1) + if (count >= HOSTIO_PATH_MAX - 1) return -1; if (safe_fromhex (p[0], &nib1) @@ -266,7 +274,7 @@ fileio_open_flags_to_host (int fileio_open_flags, int *open_flags_p) static void handle_open (char *own_buf) { - char filename[PATH_MAX]; + char filename[HOSTIO_PATH_MAX]; char *p; int fileio_flags, mode, flags, fd; struct fd_list *new_fd; @@ -442,7 +450,7 @@ handle_close (char *own_buf) static void handle_unlink (char *own_buf) { - char filename[PATH_MAX]; + char filename[HOSTIO_PATH_MAX]; char *p; int ret; @@ -470,7 +478,7 @@ static void handle_readlink (char *own_buf, int *new_packet_len) { #if defined (HAVE_READLINK) - char filename[PATH_MAX], linkname[PATH_MAX]; + char filename[HOSTIO_PATH_MAX], linkname[HOSTIO_PATH_MAX]; char *p; int ret, bytes_sent; -- 2.30.2