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Syscalls: warn when the length argument to mmap is excessive.

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If the length argument to mmap is larger than the arbitrary but reasonable
limit of 4GB, there's a good chance that the value is nonsense and not
intentional. Rather than attempting to satisfy the mmap anyway, this change
makes gem5 warn to make it more apparent what's going wrong.
This commit is contained in:
Gabe Black 2012-05-19 04:13:47 -07:00
parent 8fe8efeb34
commit 250c40799d
1 changed files with 3 additions and 0 deletions
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3
src/sim/syscall_emul.hh
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@ -1004,6 +1004,9 @@ mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
int tgt_fd = p->getSyscallArg(tc, index);
// int offset = p->getSyscallArg(tc, index);
if (length > 0x100000000ULL)
warn("mmap length argument %#x is unreasonably large.\n", length);
if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
Process::FdMap *fd_map = p->sim_fd_obj(tgt_fd);
if (!fd_map || fd_map->fd < 0) {