diff options
| author | Luca Boccassi <luca.boccassi@microsoft.com> | 2019-05-14 19:35:02 +0100 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2019-05-18 12:32:02 -0400 |
| commit | 7d57485a8a3c45c254919f01337c14cc2856accd (patch) | |
| tree | d153de42617f0bcfc783da793caa39487e26b39e /tools/fit_common.c | |
| parent | 26992928e80a7f8d86267985b211a858094dc389 (diff) | |
tools: use read-only mmap in fit_check_sign
Add an option to open files in read-only mode in mmap_fdt so
that fit_check_sign can be used to inspect files on read-only
filesystems.
For example, this is useful when a key is shipped in a read-only
rootfs or squashfs.
Signed-off-by: Luca Boccassi <luca.boccassi@microsoft.com>
Diffstat (limited to 'tools/fit_common.c')
| -rw-r--r-- | tools/fit_common.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/tools/fit_common.c b/tools/fit_common.c index 9506390214..cdf987d3c1 100644 --- a/tools/fit_common.c +++ b/tools/fit_common.c @@ -41,13 +41,14 @@ int fit_check_image_types(uint8_t type) } int mmap_fdt(const char *cmdname, const char *fname, size_t size_inc, - void **blobp, struct stat *sbuf, bool delete_on_error) + void **blobp, struct stat *sbuf, bool delete_on_error, + bool read_only) { void *ptr; int fd; /* Load FIT blob into memory (we need to write hashes/signatures) */ - fd = open(fname, O_RDWR | O_BINARY); + fd = open(fname, (read_only ? O_RDONLY : O_RDWR) | O_BINARY); if (fd < 0) { fprintf(stderr, "%s: Can't open %s: %s\n", @@ -71,7 +72,9 @@ int mmap_fdt(const char *cmdname, const char *fname, size_t size_inc, } errno = 0; - ptr = mmap(0, sbuf->st_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); + ptr = mmap(0, sbuf->st_size, + (read_only ? PROT_READ : PROT_READ | PROT_WRITE), MAP_SHARED, + fd, 0); if ((ptr == MAP_FAILED) || (errno != 0)) { fprintf(stderr, "%s: Can't read %s: %s\n", cmdname, fname, strerror(errno)); |