Hi Sascha,
----- On 28 Apr, 2020, at 08:39, Sascha Hauer s.ha...@pengutronix.de wrote:
> On Thu, Apr 23, 2020 at 10:17:09AM +0200, Clement Leger wrote:
>> When loading an elf file from a mtd device, this allows to parse the
>> header and load only the needed data according to the elf size. Without
>> that support, loading a elf file from a /dev/mtd would try to read the
>> entire partition.
>>
>> Signed-off-by: Clement Leger <cle...@kalray.eu>
>> ---
>> common/elf.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++
>> include/elf.h | 7 +++++
>> 2 files changed, 90 insertions(+)
>>
>> diff --git a/common/elf.c b/common/elf.c
>> index 5534632b2..291f883cb 100644
>> --- a/common/elf.c
>> +++ b/common/elf.c
>> @@ -5,7 +5,12 @@
>>
>> #include <common.h>
>> #include <elf.h>
>> +#include <errno.h>
>> +#include <fcntl.h>
>> +#include <libfile.h>
>> #include <memory.h>
>> +#include <unistd.h>
>> +#include <linux/fs.h>
>>
>> struct elf_section {
>> struct list_head list;
>> @@ -158,3 +163,81 @@ void elf_release_image(struct elf_image *elf)
>>
>> free(elf);
>> }
>> +
>> +static u64 elf_get_size(struct elf_image *elf)
>> +{
>> + u64 sh_size = elf_hdr_e_shentsize(elf, elf->buf) *
>> + elf_hdr_e_shnum(elf, elf->buf);
>> +
>> + /*
>> + * The section header table is located at the end of the elf file thus
>> + * we can take the offset and add the size of this table to obtain the
>> + * file size.
>> + */
>> + return elf_hdr_e_shoff(elf, elf->buf) + sh_size;
>> +}
>> +
>> +struct elf_image *elf_open(const char *filename)
>> +{
>> + int fd, ret;
>> + u64 size;
>> + struct elf64_hdr hdr;
>> + struct elf_image *elf;
>> + ssize_t read_ret;
>> +
>> + fd = open(filename, O_RDONLY);
>> + if (fd < 0) {
>> + printf("could not open: %s\n", errno_str());
>> + return ERR_PTR(-errno);
>> + }
>> +
>> + if (read(fd, &hdr, sizeof(hdr)) < 0) {
>> + printf("could not read elf header: %s\n", errno_str());
>> + ret = -errno;
>> + goto err_close_fd;
>> + }
>> +
>> + elf = xzalloc(sizeof(*elf));
>> +
>> + ret = elf_check_init(elf, &hdr);
>> + if (ret) {
>> + ret = -errno;
>> + goto err_free_elf;
>> + }
>> +
>> + size = elf_get_size(elf);
>> +
>> + elf->buf = xmalloc(size);
>
> As said before, please use malloc rather than one of the x-functions.
> The regular malloc can fail when we are out of memory and then you have
> a chance to fail gracefully.
Sorry, I understood that after and I have a v3 with this fix amongst other.
I also fixed bootm_load_os to load the existing elf file if any and modified
mips bootm accordingly. I will send it today.
Clément
>
> Sascha
>
> --
> Pengutronix e.K. | |
> Steuerwalder Str. 21 | http://www.pengutronix.de/ |
> 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
> Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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