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tools: use read-only mmap in fit_check_sign

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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>
This commit is contained in:
Luca Boccassi
2019-05-14 19:35:02 +01:00
committed by Tom Rini
parent 26992928e8
commit 7d57485a8a
5 changed files with 18 additions and 11 deletions
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9
tools/fit_common.c
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@@ -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));