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linux/arch/arm/include
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Kees Cook e280033ef1 ARM: ptrace: Restore syscall skipping for tracers 
[ Upstream commit 4697b5848b ]

Since commit 4e57a4ddf6 ("ARM: 9107/1: syscall: always store
thread_info->abi_syscall"), the seccomp selftests "syscall_errno"
and "syscall_faked" have been broken. Both seccomp and PTRACE depend
on using the special value of "-1" for skipping syscalls. This value
wasn't working because it was getting masked by __NR_SYSCALL_MASK in
both PTRACE_SET_SYSCALL and get_syscall_nr().

Explicitly test for -1 in PTRACE_SET_SYSCALL and get_syscall_nr(),
leaving it exposed when present, allowing tracers to skip syscalls
again.

Cc: Russell King <linux@armlinux.org.uk>
Cc: Arnd Bergmann <arnd@kernel.org>
Cc: Lecopzer Chen <lecopzer.chen@mediatek.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: linux-arm-kernel@lists.infradead.org
Fixes: 4e57a4ddf6 ("ARM: 9107/1: syscall: always store thread_info->abi_syscall")
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20230810195422.2304827-2-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2023-09-19 12:22:30 +02:00
..
asm ARM: ptrace: Restore syscall skipping for tracers 2023-09-19 12:22:30 +02:00
debug ARM: imx: rename DEBUG_IMX21_IMX27_UART to DEBUG_IMX27_UART 2022-01-27 11:04:29 +01:00
uapi/asm ARM development updates for 5.15: 2021-09-09 13:25:49 -07:00