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| author | Joerg Roedel <jroedel@suse.de> | 2021-05-19 16:52:49 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-06-15 12:24:21 +0300 |
| commit | f2df15639e44d23bf82a86a03092472c7278cd39 (patch) | |
| tree | 247da372fd19beae98f68d3331954f8761df8955 /arch/x86/lib/insn-eval.c | |
| parent | 4aca2d99fd27698cf82d55aed4859fde859082ac (diff) | |
| download | linux-f2df15639e44d23bf82a86a03092472c7278cd39.tar.xz | |
x86/insn-eval: Make 0 a valid RIP for insn_get_effective_ip()
In theory, 0 is a valid value for the instruction pointer so don't use
it as the error return value from insn_get_effective_ip().
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210614135327.9921-5-joro@8bytes.org
Diffstat (limited to 'arch/x86/lib/insn-eval.c')
| -rw-r--r-- | arch/x86/lib/insn-eval.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/arch/x86/lib/insn-eval.c b/arch/x86/lib/insn-eval.c index a67afd74232c..4eecb9c7c6a0 100644 --- a/arch/x86/lib/insn-eval.c +++ b/arch/x86/lib/insn-eval.c @@ -1417,7 +1417,7 @@ void __user *insn_get_addr_ref(struct insn *insn, struct pt_regs *regs) } } -static unsigned long insn_get_effective_ip(struct pt_regs *regs) +static int insn_get_effective_ip(struct pt_regs *regs, unsigned long *ip) { unsigned long seg_base = 0; @@ -1430,10 +1430,12 @@ static unsigned long insn_get_effective_ip(struct pt_regs *regs) if (!user_64bit_mode(regs)) { seg_base = insn_get_seg_base(regs, INAT_SEG_REG_CS); if (seg_base == -1L) - return 0; + return -EINVAL; } - return seg_base + regs->ip; + *ip = seg_base + regs->ip; + + return 0; } /** @@ -1455,8 +1457,7 @@ int insn_fetch_from_user(struct pt_regs *regs, unsigned char buf[MAX_INSN_SIZE]) unsigned long ip; int not_copied; - ip = insn_get_effective_ip(regs); - if (!ip) + if (insn_get_effective_ip(regs, &ip)) return 0; not_copied = copy_from_user(buf, (void __user *)ip, MAX_INSN_SIZE); @@ -1484,8 +1485,7 @@ int insn_fetch_from_user_inatomic(struct pt_regs *regs, unsigned char buf[MAX_IN unsigned long ip; int not_copied; - ip = insn_get_effective_ip(regs); - if (!ip) + if (insn_get_effective_ip(regs, &ip)) return 0; not_copied = __copy_from_user_inatomic(buf, (void __user *)ip, MAX_INSN_SIZE); |