diff options
Diffstat (limited to 'sys/boot/amd64/efi/copy.c')
| -rw-r--r-- | sys/boot/amd64/efi/copy.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/sys/boot/amd64/efi/copy.c b/sys/boot/amd64/efi/copy.c index c6cc349..c3cb475 100644 --- a/sys/boot/amd64/efi/copy.c +++ b/sys/boot/amd64/efi/copy.c @@ -37,9 +37,13 @@ __FBSDID("$FreeBSD$"); #include <efi.h> #include <efilib.h> -#define STAGE_PAGES 8192 /* 32MB */ +#ifndef EFI_STAGING_SIZE +#define EFI_STAGING_SIZE 32 +#endif -EFI_PHYSICAL_ADDRESS staging; +#define STAGE_PAGES ((EFI_STAGING_SIZE) * 1024 * 1024 / 4096) + +EFI_PHYSICAL_ADDRESS staging, staging_end; int stage_offset_set = 0; ssize_t stage_offset; @@ -55,6 +59,7 @@ x86_efi_copy_init(void) (unsigned long)(status & EFI_ERROR_MASK)); return (status); } + staging_end = staging + STAGE_PAGES * 4096; return (0); } @@ -68,6 +73,11 @@ x86_efi_copyin(const void *src, vm_offset_t dest, const size_t len) stage_offset_set = 1; } + /* XXX: Callers do not check for failure. */ + if (dest + stage_offset + len > staging_end) { + errno = ENOMEM; + return (-1); + } bcopy(src, (void *)(dest + stage_offset), len); return (len); } @@ -76,6 +86,11 @@ ssize_t x86_efi_copyout(const vm_offset_t src, void *dest, const size_t len) { + /* XXX: Callers do not check for failure. */ + if (src + stage_offset + len > staging_end) { + errno = ENOMEM; + return (-1); + } bcopy((void *)(src + stage_offset), dest, len); return (len); } @@ -85,6 +100,10 @@ ssize_t x86_efi_readin(const int fd, vm_offset_t dest, const size_t len) { + if (dest + stage_offset + len > staging_end) { + errno = ENOMEM; + return (-1); + } return (read(fd, (void *)(dest + stage_offset), len)); } |
