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Fix pledge rpath support for old getdents syscall (#804)

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The rpath pledge as currently implemented in cosmopolitan does not
allow for usage of the old getdents syscall (0x4e), which is different
from the newer getdents syscall (0xd9) solely in that it does not
support 64-bit filesystems.

This means that, for example, old statically linked binaries cannot
use `readdir` and other such functions which use this syscall instead
of the more modern one, even though there is no threat in allowing
that syscall alongside the more modern one (except that the binary may
have issues with 64-bit filesystems, but that's a separate problem).

This patch fixes this.
This commit is contained in:
Gabriel Ravier 2023-04-18 01:15:01 +02:00 committed by GitHub
parent 6758c3f400
commit f7bccf5513
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2 changed files with 3 additions and 0 deletions
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2
libc/calls/pledge-linux.c
View file

@ -292,6 +292,7 @@ static const struct thatispacked SyscallName {
{__NR_linux_epoll_wait, "epoll_wait"}, //
{__NR_linux_epoll_ctl, "epoll_ctl"}, //
{__NR_linux_getdents, "getdents"}, //
{__NR_linux_oldgetdents, "oldgetdents"}, //
{__NR_linux_set_tid_address, "set_tid_address"}, //
{__NR_linux_restart_syscall, "restart_syscall"}, //
{__NR_linux_semtimedop, "semtimedop"}, //
@ -582,6 +583,7 @@ static const uint16_t kPledgeRpath[] = {
__NR_linux_statfs, //
__NR_linux_fstatfs, //
__NR_linux_getdents, //
__NR_linux_oldgetdents, //
};
static const uint16_t kPledgeWpath[] = {

1
libc/sysv/consts/nrlinux.h
View file

@ -209,6 +209,7 @@
#define __NR_linux_epoll_wait 0x00e8
#define __NR_linux_epoll_ctl 0x00e9
#define __NR_linux_getdents 0x00d9
#define __NR_linux_oldgetdents 0x004e
#define __NR_linux_set_tid_address 0x00da
#define __NR_linux_restart_syscall 0x00db
#define __NR_linux_semtimedop 0x00dc