Re: [Libguestfs] [PATCH] mknod: filter modes in mkfifo, mknod_b, mknod_c (RHBZ#1182463).

Since mkfifo, mknod_b, and mknod_c add the correct file type to the modes of the resulting file, make sure the specified mode contains only permissions bits. --- daemon/mknod.c | 15 +++++++++++++++ generator/actions.ml | 21 ++++++++++++++++++--- 2 files changed, 33 insertions(+), 3 deletions(-) diff --git a/daemon/mknod.c b/daemon/mknod.c index 7f71210..9af8701 100644 --- a/daemon/mknod.c +++ b/daemon/mknod.c @@ -38,6 +38,15 @@ optgroup_mknod_available (void) return 1; } +#define CHECK_MODE \ + do { \ + if ((mode & ~07777) != 0) { \ + reply_with_error ("%o: mode must specify only file permission bits", \ + (unsigned int) mode); \ + return -1; \ + } \ + } while (0) + int do_mknod (int mode, int devmajor, int devminor, const char *path) { @@ -63,18 +72,24 @@ do_mknod (int mode, int devmajor, int devminor, const char *path) int do_mkfifo (int mode, const char *path) { + CHECK_MODE; + return do_mknod (mode | S_IFIFO, 0, 0, path); } int do_mknod_b (int mode, int devmajor, int devminor, const char *path) { + CHECK_MODE; + return do_mknod (mode | S_IFBLK, devmajor, devminor, path); } int do_mknod_c (int mode, int devmajor, int devminor, const char *path) { + CHECK_MODE; + return do_mknod (mode | S_IFCHR, devmajor, devminor, path); } diff --git a/generator/actions.ml b/generator/actions.ml index 96a9dd6..c48ad1a 100644 --- a/generator/actions.ml +++ b/generator/actions.ml @@ -6173,7 +6173,9 @@ The mode actually set is affected by the umask." }; InitScratchFS, Always, TestResult ( [["mkfifo"; "0o777"; "/mkfifo"]; ["stat"; "/mkfifo"]], - "S_ISFIFO (ret->mode) && (ret->mode & 0777) == 0755"), [] + "S_ISFIFO (ret->mode) && (ret->mode & 0777) == 0755"), []; + InitScratchFS, Always, TestLastFail ( + [["mkfifo"; "0o20777"; "/mkfifo-2"]]), []; ]; shortdesc = "make FIFO (named pipe)"; longdesc = "\ @@ -6181,6 +6183,9 @@ This call creates a FIFO (named pipe) called C<path> with mode C<mode>. It is just a convenient wrapper around C<guestfs_mknod>. +Unlike with C<guestfs_mknod>, C<mode> B<must> contain only permissions +bits. + The mode actually set is affected by the umask." }; { defaults with @@ -6192,7 +6197,9 @@ The mode actually set is affected by the umask." }; InitScratchFS, Always, TestResult ( [["mknod_b"; "0o777"; "99"; "66"; "/mknod_b"]; ["stat"; "/mknod_b"]], - "S_ISBLK (ret->mode) && (ret->mode & 0777) == 0755"), [] + "S_ISBLK (ret->mode) && (ret->mode & 0777) == 0755"), []; + InitScratchFS, Always, TestLastFail ( + [["mknod_b"; "0o10777"; "99"; "66"; "/mknod_b-2"]]), []; ]; shortdesc = "make block device node"; longdesc = "\ @@ -6200,6 +6207,9 @@ This call creates a block device node called C<path> with mode C<mode> and device major/minor C<devmajor> and C<devminor>. It is just a convenient wrapper around C<guestfs_mknod>. +Unlike with C<guestfs_mknod>, C<mode> B<must> contain only permissions +bits. + The mode actually set is affected by the umask." }; { defaults with @@ -6211,7 +6221,9 @@ The mode actually set is affected by the umask." }; InitScratchFS, Always, TestResult ( [["mknod_c"; "0o777"; "99"; "66"; "/mknod_c"]; ["stat"; "/mknod_c"]], - "S_ISCHR (ret->mode) && (ret->mode & 0777) == 0755"), [] + "S_ISCHR (ret->mode) && (ret->mode & 0777) == 0755"), []; + InitScratchFS, Always, TestLastFail ( + [["mknod_c"; "0o20777"; "99"; "66"; "/mknod_c-2"]]), []; ]; shortdesc = "make char device node"; longdesc = "\ @@ -6219,6 +6231,9 @@ This call creates a char device node called C<path> with mode C<mode> and device major/minor C<devmajor> and C<devminor>. It is just a convenient wrapper around C<guestfs_mknod>. +Unlike with C<guestfs_mknod>, C<mode> B<must> contain only permissions +bits. + The mode actually set is affected by the umask." }; { defaults with -- 1.9.3