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arm64: Do not forget syscall when starting a new thread.

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[ Upstream commit de6921856f99c11d3986c6702d851e1328d4f7f6 ]

Enable tracing of the execve*() system calls with the
syscalls:sys_exit_execve tracepoint by removing the call to
forget_syscall() when starting a new thread and preserving the value of
regs->syscallno across exec.

Signed-off-by: Francis Laniel <flaniel@linux.microsoft.com>
Link: https://lore.kernel.org/r/20220608162447.666494-2-flaniel@linux.microsoft.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Francis Laniel 2022-06-08 17:24:46 +01:00 • committed by Greg Kroah-Hartman
commit fa09c39265
1 changed files with 2 additions and 1 deletions
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3
arch/arm64/include/asm/processor.h
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@ -184,8 +184,9 @@ void tls_preserve_current_state(void);
static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)
{
s32 previous_syscall = regs->syscallno;
memset(regs, 0, sizeof(*regs));
forget_syscall(regs);
regs->syscallno = previous_syscall;
regs->pc = pc;
if (system_uses_irq_prio_masking())