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Multiboot patches

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Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Multiboot patches

# gpg: Signature made Wed 21 Mar 2018 14:38:36 GMT
# gpg:                using RSA key 7F09B272C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>"
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* remotes/kevin/tags/for-upstream:
  tests/multiboot: Add .gitignore
  tests/multiboot: Add tests for the a.out kludge
  tests/multiboot: Test exit code for every qemu run
  multiboot: Check validity of mh_header_addr
  multiboot: Reject kernels exceeding the address space

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2018-03-22 14:01:29 +00:00
commit 211d626020
6 changed files with 227 additions and 20 deletions
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8
hw/i386/multiboot.c
View file

@ -229,6 +229,10 @@ int load_multiboot(FWCfgState *fw_cfg,
error_report("invalid load_addr address");
exit(1);
}
if (mh_header_addr - mh_load_addr > i) {
error_report("invalid header_addr address");
exit(1);
}
uint32_t mb_kernel_text_offset = i - (mh_header_addr - mh_load_addr);
uint32_t mb_load_size = 0;
@ -247,6 +251,10 @@ int load_multiboot(FWCfgState *fw_cfg,
}
mb_load_size = kernel_file_size - mb_kernel_text_offset;
}
if (mb_load_size > UINT32_MAX - mh_load_addr) {
error_report("kernel does not fit in address space");
exit(1);
}
if (mh_bss_end_addr) {
if (mh_bss_end_addr < (mh_load_addr + mb_load_size)) {
error_report("invalid bss_end_addr address");