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Truncate arg[0] to int in select decoding.

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This matches kernel's behavior.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
This commit is contained in:
Denys Vlasenko 2013-11-05 16:20:16 +01:00
parent c4b9214a0f
commit 1f65c3cd2a
1 changed files with 5 additions and 4 deletions
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9
desc.c
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@ -481,16 +481,17 @@ static int
decode_select(struct tcb *tcp, long *args, enum bitness_t bitness)
{
int i, j;
unsigned nfds, fdsize;
int nfds, fdsize;
fd_set *fds;
const char *sep;
long arg;
fdsize = args[0];
/* Kernel truncates arg[0] to int, we do the same */
fdsize = (int)args[0];
/* Beware of select(2^31-1, NULL, NULL, NULL) and similar... */
if (args[0] > 1024*1024)
if (fdsize > 1024*1024)
fdsize = 1024*1024;
if (args[0] < 0)
if (fdsize < 0)
fdsize = 0;
nfds = fdsize;
fdsize = (((fdsize + 7) / 8) + sizeof(long)-1) & -sizeof(long);