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| author | H. Peter Anvin <hpa@linux.intel.com> | 2010-06-21 17:33:57 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2010-06-21 17:33:57 -0700 |
| commit | 1004a727316071be17d7983323e736ee3b70ed01 (patch) | |
| tree | 97be0ac3ef8799e9e277d071769bb3c9502712e8 /utils | |
| parent | 1d0c49827da98d852d42fadd56b073ad3d3f1faa (diff) | |
| download | syslinux-1004a727316071be17d7983323e736ee3b70ed01.tar.gz syslinux-1004a727316071be17d7983323e736ee3b70ed01.tar.xz syslinux-1004a727316071be17d7983323e736ee3b70ed01.zip | |
memdiskfind: sanity check the FBM value
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'utils')
| -rw-r--r-- | utils/memdiskfind.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/utils/memdiskfind.c b/utils/memdiskfind.c index 331bfb35..45d54bc7 100644 --- a/utils/memdiskfind.c +++ b/utils/memdiskfind.c @@ -93,13 +93,16 @@ int main(int argc, char *argv[]) munmap((void *)map, 4096); + if (fbm < 64 || fbm >= 640) + return 1; + mapbase = (fbm << 10) & ~(page - 1); maplen = 0xa0000 - mapbase; map = mmap(NULL, maplen, PROT_READ, MAP_SHARED, memfd, mapbase); if (map == MAP_FAILED) { fprintf(stderr, "%s: cannot map base memory: %s\n", argv[0], strerror(errno)); - exit(1); + return 2; } ptr = map + ((fbm << 10) & (page - 1)); |