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MIPS: Fix MAX_REG_OFFSET

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[ Upstream commit c44572e0cc13c9afff83fd333135a0aa9b27ba26 ]

Fix MAX_REG_OFFSET to point to the last register in 'pt_regs' and not to
the marker itself, which could allow regs_get_register() to return an
invalid offset.

Fixes: 40e084a506 ("MIPS: Add uprobes support.")
Suggested-by: Maciej W. Rozycki <macro@orcam.me.uk>
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Thorsten Blum
2025-04-27 13:34:24 +02:00
committed by Greg Kroah-Hartman
parent 66c4ec15e3
commit 1c0620213f
1 changed files with 2 additions and 1 deletions
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3
arch/mips/include/asm/ptrace.h
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@@ -65,7 +65,8 @@ static inline void instruction_pointer_set(struct pt_regs *regs,
/* Query offset/name of register from its name/offset */
extern int regs_query_register_offset(const char *name);
#define MAX_REG_OFFSET (offsetof(struct pt_regs, __last))
#define MAX_REG_OFFSET \
(offsetof(struct pt_regs, __last) - sizeof(unsigned long))
/**
* regs_get_register() - get register value from its offset