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select: fix 64-bit timeout truncation on pre-time64 kernels

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If the (normalized) timeout passed to select exceeds INT_MAX seconds on
an arch with SYS_pselect6_time64 and the kernel is too old to support
time64 syscalls, the timeout is implicitly converted to (32-bit) long on
the fallback path, losing its upper 32 bits and potentially becoming a
small positive value, violating the intended semantics, or even
a negative value, causing the fallback syscall failure. Fix this by
saturating the timeout at INT_MAX as done in other time64 fallback
cases.
This commit is contained in:
Alexey Izbyshev 2023-03-02 08:10:47 +03:00 committed by Rich Felker
parent 3281047cfc
commit 8949da7ab1
1 changed files with 1 additions and 0 deletions
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src/select/select.c
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@ -33,6 +33,7 @@ int select(int n, fd_set *restrict rfds, fd_set *restrict wfds, fd_set *restrict
((syscall_arg_t[]){ 0, _NSIG/8 }));
if (SYS_pselect6 == SYS_pselect6_time64 || r!=-ENOSYS)
return __syscall_ret(r);
s = CLAMP(s);
#endif
#ifdef SYS_select
return syscall_cp(SYS_select, n, rfds, wfds, efds,